Monitoring IS-IS

The CLI has commands available for monitoring IS-IS parameters and CLNS parameters.

System Event Logs

To troubleshoot and monitor IP, use the following system event logs:

isisAdjChange—IS-IS adjacency up or down events
isisAdjPackets—IS-IS adjacency hello packets
isisBfdEvents—IS-IS interactions with BFD
isisChecksumErr—IS-IS checksum errors
isisGeneral—IS-IS system notifications
isisHelloGeneral—IS-IS system notifications
isisHelloPackets—IS-IS hello packets
isisipv6Log—IS-IS IPv6 notifications
isisLdpEvents—IS-IS interactions with LDP
isisLocalUpdate—IS-IS local LSP packets
isisMplsTeAdvertisements—IS-IS MPLS traffic engineering advertisements
isisMplsTeEvents—IS-IS MPLS traffic engineering
isisNsfEvents—IS-IS nonstop forwarding events during warm starts
isisProtocolErr—IS-IS protocol errors
isisSnpPackets—IS-IS complete sequence numbers PDU (CSNP) and partial sequence numbers PDU (PSNP) packets
isisSpfEvents—IS-IS Shortest Path First (SPF)
isisSpfStatistics—IS-IS SPF timing and statistic data
isisSpfTriggers—IS-IS SPF triggering
isisUpdate Packets—IS-IS LSP packets sent or received

For more information about using event logs, see the JunosE System Event Logging Reference Guide.

Monitoring IS-IS Parameters

You can monitor the IS-IS link-state database and IS-IS debug information. Use the commands in this section to:

Display router information.
Display information about SPF calculations.
Monitor IS-IS summary address information.
Display debug information.
Display host.
Display information about MPLS tunnels.
Clear adjacencies.
Display paths to intermediate systems.
Display information about the settings for IS-IS graceful restart.

You can use the output filtering feature of the show command to include or exclude lines of output based on a text string you specify. See JunosE System Basics Configuration Guide, for details.

clear isis adjacency

Use to remove entries from the adjacency database.
Specify a hostname or the system ID of a neighbor to clear only adjacencies with that neighbor.
Specify no options to remove all adjacencies from the database.
Example
host1#clear isis adjacency
There is no no version.
See clear isis adjacency

debug isis

Use to obtain debug-related information about certain parameters.
This command manipulates the same log as the Global Configuration log commands.
You can select from these parameters:
- adj-packets—IS-IS adjacency-related packets
- mpls traffic-eng advertisements—MPLS traffic-engineering agent advertisements
- mpls traffic-eng agents—MPLS traffic-engineering agents
- snp-packets—IS-IS CSNP/PSNP packets
- spf-events —IS-IS Shortest Path First events
- spf-statistics—IS-IS SPF timing and statistic data
- spf-triggers—IS-IS SPF triggering events
- update-packets—IS-IS update-related packets
Example
host1#debug isis adj-packets
Use the no version to disable debugging display.
See debug isis

show hosts

Use to display the name-to-NSAP mappings defined with the clns host command.
Field descriptions
- Static Host Table
  - name—Name assigned to the host
  - ip address—Host IP address
  - type—Type of host
  - username—Username necessary to access the host
  - password—Password necessary to access the host
- Clns Host Alias Table
  - name—Name of the host alias
  - area address—Area address of the host alias
  - system ID—Six-byte value of the host alias
  - type—Type of host alias

Example

host1:abc#show hosts
Static Host Table
-----------------
name   ip address   type   username    password
----   ----------   ----   ---------   --------
jkk    10.10.0.73   ftp    anonymous   null

Clns Host Alias Table
---------------------
name  area address                     system ID         type
----- -------------------------------- ----------------- ------
fred  47.0005.80FF.F800.0000.0001.0001 0000.0000.0011.00 static
karen 47.0005.80FF.F800.0000.0001.0001 0000.0000.0012.00 static

See show hosts

show isis database

Use to display IS-IS link-state database information.
Request specific show isis database statistics by selecting from these options:
- lspid—Link-state protocol ID in form xxxx.xxxx.xxxx.yy-zz
- hostname—Link-state database information for the specified hostname
- detail—Detailed link-state database information; if this option is not specified, a summary display is provided
- l1—Level 1 routing link-state database
- l2 —Level 2 routing link-state database
- level-1—Level 1 routing link-state database
- level-2—Level 2 routing link-state database
Each option can be entered in an arbitrary string within a single command entry.
Field descriptions
- LSPID—LSP identifier
- LSP Seq Num—Sequence number for the LSP. Enables other routers to determine if they have received the latest information from source.
- LSP Checksum—Checksum of the LSP packet
- LSP Holdtime—Number of seconds that the LSP remains valid
- ATT—Attach bit; indicates that the router is a level 2 router and can reach other areas
- P—P bit; detects whether intermediate system is capable of area partition repair
- OL—Overload bit; determines whether intermediate system is congested
- Area Address—Area addresses that can be reached from the router
- NLPID—ISO network layer protocol identifier
- IP Address—IP address of the interface
- Hostname—Hostname of the router
- Router ID—ID configured on the router
- Metric —Metric that indicates either of the following costs:
  - Cost of adjacency between the originating router and the advertised neighbor
  - Cost between the advertising router and the advertised destination
- IPv4 Interface Address—Address of the interface
- IPv4 Neighbor Address—Address of a neighbor
- Maximum link bandwidth—Bandwidth capacity of the link in bits per second
- Reservable link bandwidth—Amount of bandwidth reservable on the link (whether reserved or not)
- Unreserved bandwidth—Amount of bandwidth available for reservation on the link
- TE default metric—Traffic engineering default metric value
- Tag value(s)—Route tag assigned to the IS-IS interface, if configured

Example 1

host1#show isis database
IS-IS Level-1 Link State Database
LSPID LSP    Seq Num     LSP Checksum LSP Holdtime ATT/P/OL
0000.0000.004E.00-00  0x000013F5   0x8BAA 1198         0/0/0
0000.0000.3333.00-00* 0x0000020F   0xEA1E 1199         0/0/0
0000.0000.3333.02-00  0x00000007   0x8C30 1199         0/0/0
0000.0000.7500.00-00  0x0000308D   0x5EDF 1198         0/0/0
0090.1A00.B000.00-00  0x00000011   0xB082 1195         1/0/0
0090.1A00.C000.00-00  0x0000005F   0x9860 1196         0/0/0

IS-IS Level-2 Link State Database
LSPID LSP    Seq Num     LSP Checksum LSP Holdtime ATT/P/OL
0000.0000.004E.00-00  0x00001355   0x0DA7 1198         0/0/0
0000.0000.3333.00-00* 0x00000257   0x566B 1199         0/0/0
0000.0000.3333.02-00  0x00000007   0x8C30 1199         0/0/0
0000.0000.7500.00-00  0x00003315   0x3627 1198         0/0/0
0010.7B36.5FF7.00-00  0x00000BAF   0x187A 1183         0/0/0
0090.1A00.B000.00-00  0x00000016   0xD624 1195         1/0/0
0090.1A00.C000.00-00  0x00000071   0x9358 1196        0/0/0

Example 2

host1#show isis database detail
LSPID LSP    Seq Num     LSP Checksum LSP Holdtime ATT/P/OL
boston.00-00*0x000001160x4760 6551/0/0
  Area Address: 47.0005.80FF.F800.0000.0000.0004
  NLPID:       0x81 0xcc
  IP Address:  10.1.1.1
  Hostname: boston
  Router ID:  10.1.1.1
  Metric: 10 IS newyork.00
    IPv4 Interface Address:  10.1.1.1
    IPv4 Neighbor Address:   10.1.1.2
  Metric: 10 IS washington.00
    IPv4 Interface Address:  10.1.3.1
    IPv4 Neighbor Address:   10.1.3.3
  Metric: 10 IP 192.168.1.0/24
  Metric: 10 IP 10.1.1.0/24  tag value(s):   11
  Metric: 10 IP 10.1.3.0/24
  Metric: 20 IP 10.1.2.0/24  tag value(s):   22

Example 3

host1#show isis database verbose
IS-IS Level-1 Link State Database
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime  ATT/P/OL
zion.00-00*           0x00000011   0xBFAD        487           0/0/0
  Area Address: 47.0005.80FF.F800.0000.0000.0003
  NLPID:       0x81 0xcc
  IP Address:  222.9.1.1
  Hostname: zion
  Router ID:  222.9.1.1
  Metric: 0  ES 2220.0900.1001
  Metric: 10 IS london.00
        Administrative group:  0
        IPv4 Interface Address:  221.1.1.1
        IPv4 Neighbor Address:   221.1.1.2
        Maximum link bandwidth:  50000
        Reservable link bandwidth:  50000
        Unreserved bandwidth:
          Priority 0:  50000
          Priority 1:  50000
          Priority 2:  50000
          Priority 3:  50000
          Priority 4:  30000
          Priority 5:  30000
          Priority 6:  30000
          Priority 7:  30000
        TE default metric:  0
  Metric: 10 IS london.00
        Administrative group:  0
        IPv4 Interface Address:  221.1.6.1
        IPv4 Neighbor Address:   221.1.6.2
        Maximum link bandwidth:  50000
        Reservable link bandwidth:  50000
        Unreserved bandwidth:
          Priority 0:  50000
          Priority 1:  50000
          Priority 2:  50000
          Priority 3:  50000
          Priority 4:  30000
          Priority 5:  30000
          Priority 6:  30000
          Priority 7:  30000
        TE default metric:  0
  Metric: 10 IS paris.00
        Administrative group:  0
        IPv4 Interface Address:  221.1.4.1
        IPv4 Neighbor Address:   221.1.4.4
        Maximum link bandwidth:  0
        Reservable link bandwidth:  0
        Unreserved bandwidth:
          Priority 0:  0
          Priority 1:  0
          Priority 2:  0
          Priority 3:  0
          Priority 4:  0
          Priority 5:  0
          Priority 6:  0
          Priority 7:  0
        TE default metric:  0
  Metric: 10 IP 221.1.1.0/24
  Metric: 10 IP 221.1.6.0/24
  Metric: 10 IP 221.1.4.0/24
  Metric: 0 IP 222.9.1.1/32

Example 4

host1#show isis database Getafix:v2
IS-IS Level-1 Link State Database
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime  ATT/P/OL
Getafix:v2.00-00*     0x00000001   0xEB53        1097          0/0/0

IS-IS Level-2 Link State Database
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime  ATT/P/OL
Getafix:v2.00-00*     0x00000001   0x456D        1097          0/0/0

Example 5

host1#show isis database Getafix:v2 detail
IS-IS Level-1 Link State Database
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime  ATT/P/OL
Getafix:v2.00-00*     0x00000001   0xEB53        967           0/0/0
  Area Address: 22
  NLPID:       0x81 0xcc
  IP Address:  1.1.1.2
  Hostname: Getafix:v2
  Metric: 10 IS Getafix:v2.01
  Metric: 0  ES Getafix:v2
  Metric: 10 IP 1.1.1.0 255.255.255.0

IS-IS Level-2 Link State Database
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime  ATT/P/OL
Getafix:v2.00-00*     0x00000001   0x456D        967           0/0/0
  Area Address: 22
  NLPID:       0x81 0xcc
  IP Address:  1.1.1.2
  Hostname: Getafix:v2
  Metric: 10 IS Getafix:v2.01
  Metric: 10 IP 1.1.1.0 255.255.255.0

Example 6—For IS-IS IPv6 configuration

host1:2#show isis database detail
IS-IS Level-1 Link State Database
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime  ATT/P/OL
sw-rex320-19:R3.00-00*0x00000FAE   0x7B21        13            0/0/0
  Area Address: 39.840F.8011.3963.0000.0001.9262
  NLPID:       0x81 0xcc
  IP Address:  2.2.2.2
  Hostname: sw-rex320-19:R3
  Metric: 10 IS sw-rex320-19:R3.01
  Metric: 0  ES sw-rex320-19:R3
  Metric: 10 IP 5.5.5.0 255.255.255.0
  Metric: 0  IP 3.3.3.0 255.255.255.0
   Metric: 0 IPv6 Internal Up 3::/64
sw-rex320-19:R3.01-00*0x00000FA7   0x52F0        13            0/0/0
  Metric: 0  IS sw-rex320-19:R3.00
  Metric: 0  IS sw-rex320-22:R3.00
sw-rex320-22:R3.00-00 0x00000118   0x8CFB        4             0/0/0
  Area Address: 39.840F.8011.3963.0000.0001.9262
  NLPID:       0x81 0xcc
  IP Address:  8.8.8.8
  Hostname: sw-rex320-22:R3
  Metric: 10 IS sw-rex320-19:R3.01
  Metric: 0  ES sw-rex320-22:R3
  Metric: 10 IP 5.5.5.0 255.255.255.0
  Metric: 0  IP 9.9.9.0 255.255.255.0
  Metric: 10 IPv6 Internal Up 5::/64
  Metric: 0 IPv6 Internal Up 9::/64
3 LSPs

See show isis database

show isis mpls adjacency-log

Use to display a log of the last 20 IS-IS adjacency changes.
Field descriptions
- When—Amount of time since recording the log entry
- Neighbor ID—Identifier for the neighbor
- IP Address—IP address of the neighbor
- Interface—Interface from which neighbor was learned
- Status—Adjacency status, Up or Down
- Level—IS-IS routing level

Example

host1#show isis mpls adjacency-log
IS-IS MPLS TE log
When      Neighbor ID        IP Address   Interface Status  Level
02:25:47  2220.0900.2002.00  221.1.1.2    at2/0.1   Up      L1
02:25:47  2220.0900.2002.00  221.1.6.2    at2/0.6   Up      L1
02:25:47  2220.0900.4004.00  221.1.4.4    at2/1.5   Up      L1

See show isis mpls adjacency-log

show isis mpls advertisements

Use to display the last record flooded from MPLS.
Field descriptions
- System ID—Name or system ID of the MPLS tail-end (destination) router
- Router ID—Router ID for the router
- Link Count—Number of links that MPLS advertises
- Neighbor System ID—Identifier of the remote system in an area
- Administrative group—TLV administrative group or color assigned to the link
- Interface IP address—IP address of the interface
- Neighbor IP Address—IP address of the neighbor
- Maximum link bandwidth—Bandwidth capacity of the link in bits per second
- Reservable link bandwidth—Amount of bandwidth reservable on the link (whether reserved or not)
- Unreserved bandwidth—Amount of bandwidth available for reservation on the link
- TE default metric—Traffic engineering default metric value
- Affinity Bits—Attributes flooded for the link

Example

host1#show isis mpls advertisements
System ID: zion.00
  Router ID:  222.9.1.1
    Link[1]
      Neighbor System ID: london.00
        Administrative group:  0
        IPv4 Interface Address:  221.1.1.1
        IPv4 Neighbor Address:   221.1.1.2
        Maximum link bandwidth:  50000
        Reservable link bandwidth:  50000
        Unreserved bandwidth:
          Priority 0:  50000
          Priority 1:  50000
          Priority 2:  50000
          Priority 3:  50000
          Priority 4:  30000
          Priority 5:  30000
          Priority 6:  30000
          Priority 7:  30000
        TE default metric:  0
    Link[2]
      Neighbor System ID: london.00
        Administrative group:  0
        IPv4 Interface Address:  221.1.6.1
        IPv4 Neighbor Address:   221.1.6.2
        Maximum link bandwidth:  50000
        Reservable link bandwidth:  50000
        Unreserved bandwidth:
          Priority 0:  50000
          Priority 1:  50000
          Priority 2:  50000
          Priority 3:  50000
          Priority 4:  30000
          Priority 5:  30000
          Priority 6:  30000
          Priority 7:  30000
        TE default metric:  0
    Link[3]
      Neighbor System ID: paris.00
        Administrative group:  0
        IPv4 Interface Address:  221.1.4.1
        IPv4 Neighbor Address:   221.1.4.4
        Maximum link bandwidth:  0
        Reservable link bandwidth:  0
        Unreserved bandwidth:
          Priority 0:  0
          Priority 1:  0
          Priority 2:  0
          Priority 3:  0
          Priority 4:  0
          Priority 5:  0
          Priority 6:  0
          Priority 7:  0
        TE default metric:  0

See show isis mpls advertisements

show isis mpls tunnel

Use to display information about tunnels used in the calculation of IS-IS next hops.
Field descriptions
- System Id—Name or system ID of the MPLS tail-end (destination) router
- Tunnel Name—Name of the MPLS tunnel interface
- Nexthop—Destination IP address of the MPLS tunnel
- Metric —Metric of the MPLS tunnel
- Mode—Metric mode, either absolute or relative

Example

host1#show isis mpls tunnel
System Id         Tunnel Name   Nexthop    Metric    Mode
dakota-router1.00 Tunnel1       2.2.2.2    -3        Relative
                  Tunnel2       2.2.2.2    11        Absolute
jersey-router2.00 Tunnel3       3.3.3.3    -1        Relative
                  Tunnel4       3.3.3.3

See show isis mpls tunnel

show isis nsf

Use to display information about the configured and operational settings on the router for IS-IS graceful restart, which is also known as nonstop forwarding (NSF).
Field descriptions
- Configured Timer Values—Displays the following values configured for IS-IS graceful restart on the router, as described in Configuring Graceful Restart.
  - Graceful Restart—Setting for IS-IS graceful restart on the router: Enabled or Disabled
  - T3 Timer—Method by which the restarting router obtains the T3 wait time: Manual or Derive from adjacency
  - T3 Timeout Value—Maximum time, in seconds, that the restarting router waits before setting the overload bit to indicate that IS-IS graceful restart has failed
  - T2 Timeout Value—Maximum time for IS-IS level 1 routing and level 2 routing, in seconds, that the restarting router waits for the LSP database to synchronize
  - T1 Timeout Value—Time interval, in seconds, between IS-IS restart requests sent by the restarting router on this interface to neighboring routers
  - T1 Retry Count—Number of times the restarting router resends unacknowledged restart requests on this interface at the specified interval
  - Adj. Wait Time—Maximum time, in seconds, that an IS-IS process on the restarting router waits for all interfaces with IS-IS adjacencies to come up before completing the restart process
- Operation Timer Values—Displays the following currently remaining timer settings, in seconds, for IS-IS graceful restart during the restart process:
  - T3 Timer—Remaining time before the restarting router sets the overload bit to indicate that graceful restart has failed
  - T2 Timeout Value—Remaining time for level 1 routing and level 2 routing that the restarting router waits for the LSP database to synchronize
  - Adj. Wait Time—Remaining time that the restarting router waits for all adjacencies to come up before completing the restart process
  - Restart Ack Recv Adj Count—Number of neighboring IS-IS routers for level 1 routing and level 2 routing that have acknowledged the restart requests sent by the router
  - LAN If DIS Wait Count—Number of interfaces on which the restarting router is waiting to receive election of the designated intermediate system (DIS)
  - Restart CSNP Adj Recv Count—Number of adjacencies for level 1 routing and level 2 routing that have sent complete sequence number PDUs (CSNPs) to provide information about LSP database synchronization
  - Local LSP Wait Count—Number of level 1 and level 2 LSPs for which the restarting router is awaiting complete synchronization

Example

host1#show isis nsf
Configured Timer Values
-----------------------
 Graceful Restart           : Enabled
 T3 Timer                   : Manual
 T3 Timeout Value           : 80
 T2 Timeout Value           : 70(level-1)
                              70(level-2)
 T1 Timeout Value           : 60
 T1 Retry Count             : 3
 Adj. Wait Time             : 30
 
Operation Timer Values
----------------------
 T3 Timer                   : 0
 T2 Timeout Value           : 0(level-1)
                              0(level-2)
 Adj. Wait Time             : 0
 Restart Ack Recv Adj Count : 0(level-1)
                              0(level-2)
 LAN If DIS Wait Count      : 0
 Restart CSNP Adj Recv Count: 0(level-1)
                              0(level-2)
 Local LSP Wait Count       : 0(level-1)
                              0(level-2)

See show isis nsf

show isis spf-log

Use to display how often and why the router has run a full SPF calculation.
Field descriptions
- When—Amount of time since a full SPF calculation took place, given in hours:minutes:seconds. The previous 20 calculations are logged.
- Duration—Number of seconds to complete this SPF run. The elapsed time is in actual clock time, not CPU time.
- First Trigger LSP—Whenever a full SPF calculation is triggered by a new LSP, the LSP ID is stored in the router
- SpfType—Type of SPF run
- Triggers—List of causes that triggered the SPF calculation

Example 1

host1#show isis spf-log 
Level 1 SPF log
When     Duration      First Trigger LSP    SpfType  Triggers
00:01:45 0.000         0000.0000.0000.00-00 Full     LSP Add
00:01:36 0.000         0000.0000.0000.00-00 Full     LSP Add
00:01:31 0.000         0000.0101.0101.00-00 Full     LSP Add
00:00:08 0.000         0000.0101.0101.00-00 PRC      LSP Sequence Update

Example 2

host1#show isis spf-log detail 
Level 1 SPF log
When     Duration      First Trigger LSP    SpfType  Triggers
00:01:53 0.000         0000.0000.0000.00-00 Full     LSP Add
  RTupdt 0.000
  RtLeak 0.000
00:01:44 0.000         0000.0000.0000.00-00 Full     LSP Add
  RTupdt 0.000
  RtLeak 0.000
00:01:39 0.000         0000.0101.0101.00-00 Full     LSP Add
  RTupdt 0.000
  RtLeak 0.000
00:00:16 0.000         0000.0101.0101.00-00 PRC      LSP Sequence Update
  RTupdt 0.000
  RtLeak 0.000

See show isis spf-log

show isis summary-addresses

Use to display the status of IS-IS aggregate addresses.
Field descriptions
- Address—Aggregate addresses advertised by summarization process
- Mask—IP subnet masks used for the summary routes
- Level—Level for which multiple groups of addresses can be summarized
- Metric—Metric used to advertise the summary
- State—State of the summary address
- Prefix—IPv6 prefix
- Tag—Number in the range 1–4294967295 that identifies the route tag assigned to the IS-IS IPv6 interface

Example 1—For IS-IS IP addresses

host1#show isis summary-addresses
Address       Mask         Level       Metric   State
--------      ----------   ---------   ------   -------
3.0.0.0       255.0.0.0    LEVEL-1     0        ENABLED
4.0.0.0       255.0.0.0    LEVEL-1-2   5        ENABLED

Example 2—For IS-IS IPv6 addresses

host1#show isis summary-addresses
Prefix         Level            Metric         Tag     State
------------   -------------    ----------     ------  -------
2008::0/8      LEVEL-2          0              100     ENABLED

See show isis summary-addresses

show isis topology

Use to display the paths to all intermediate systems or specific types of intermediate systems.
Field descriptions
- System ID—Name or system ID of the intermediate system
- Metric—Metric of the path to the intermediate system
- Next Hop—Destination IP address of the intermediate system
- Interface—Interface from which neighbor was learned
- SNPA—Subnetwork point of attachment; for a LAN circuit, it is the MAC address; not meaningful for a point-to-point circuit.

Example

host1#show isis topology level-1
              IS-IS paths for level-1 routers
              -------------------------------
  System-ID   Metric    Next Hop       Intf      SNPA
------------- ------   -------------  --------   ----
barcelona:vr2  10      barcelona:vr2  at2/0.12

See show isis topology

undebug isis

Use to cancel the display of information about a selected event.
The same IS-IS variables can be designated as in the debug isis command.
Example
host1#undebug isis adj-packets
There is no no version.
See undebug isis

Displaying CLNS

You can display the following information related to the CLNS protocol:

CLNS information about interfaces
Information about router adjacencies
Information about ES and IS neighbors
Protocol-specific information for each routing process
Information about CLNS packets
Global CLNS configurations

You can set a statistics baseline for CLNS using the baseline clns command.

baseline clns

Use to set a statistics baseline for CLNS.
The router implements the baseline by reading and storing the statistics at the time the baseline is set and then subtracting this baseline whenever baseline-relative statistics are retrieved.
Use the optional interface-specifier parameter to specify an interface; otherwise the command sets a baseline for all interfaces.
You cannot set a baseline for groups of interfaces.
When baselining is requested, the time since the last baseline was set is displayed in days, hours, minutes, and seconds.
Use the optional delta keyword with the show clns traffic command to specify that baselined statistics are to be shown.

Example

host1#show clns traffic detail
IS-IS: Baseline last set 0 days, 0 hours, 1 minutes, 41 seconds
IS-IS: Corrupted LSPs: 0
IS-IS: L1 LSP Database Overloads: 0
IS-IS: L2 LSP Database Overloads: 0
IS-IS: Area Addresses Dropped: 0
IS-IS: Attempts to Exceed Max Sequence: 0
IS-IS: Sequence Numbers Skipped: 6
IS-IS: Own LSPs Purged: 1
IS-IS: System ID Length Mismatches: 0
IS-IS: Maximum Area Mismatches: 0

Interface: atm2/1.3
IS-IS: Baseline last set 0 days, 0 hours, 1 minutes, 43 seconds
IS-IS: Protocol PDUs (in/out): 32/36
IS-IS: Init Failures: 0
IS-IS: Adjacencies Changes: 1
IS-IS: Adjacencies Rejected: 0
IS-IS: Bad LSPs: 0
IS-IS: Level-1 Designated IS Changes: 0
IS-IS: Level-2 Designated IS Changes: 0 
IS-IS: Invalid 9542s: 0
host1#baseline clns atm 2/1.3
host1#show clns traffic detail delta
IS-IS: Baseline last set 0 days, 0 hours, 2 minutes, 27 seconds
IS-IS: Corrupted LSPs: 0
IS-IS: L1 LSP Database Overloads: 0
IS-IS: L2 LSP Database Overloads: 0
IS-IS: Area Addresses Dropped: 0
IS-IS: Attempts to Exceed Max Sequence: 0
IS-IS: Sequence Numbers Skipped: 6
IS-IS: Own LSPs Purged: 1
IS-IS: System ID Length Mismatches: 0
IS-IS: Maximum Area Mismatches: 0

Interface: atm2/1.3
IS-IS: Baseline last set 0 days, 0 hours, 0 minutes, 8 seconds
IS-IS: Protocol PDUs (in/out): 2/1
IS-IS: Init Failures: 0
IS-IS: Adjacencies Changes: 0
IS-IS: Adjacencies Rejected: 0
IS-IS: Bad LSPs: 0
IS-IS: Level-1 Designated IS Changes: 0
IS-IS: Level-2 Designated IS Changes: 0
IS-IS: Invalid 9542s: 0

There is no no version.
See baseline clns

clear isis database

Use to delete all entries from the IS-IS link-state database, or only the entries associated with the specified neighbor.
Field descriptions
- LSPID—LSP identifier
- LSP Seq Num—Sequence number for the LSP. Enables other routers to determine if they have received the latest information from source.
- LSP Checksum—Checksum of the LSP packet
- LSP Holdtime—Number of seconds that the LSP remains valid
- ATT—Attach bit; indicates that the router is a level 2 router and can reach other areas
- P—P bit; detects whether intermediate system is capable of area partition repair
- OL—Overload bit; determines whether intermediate system is congested

Example

host1#show isis database
IS-IS Level-1 Link State Database
LSPID          LSP Seq Num  LSP Checksum  LSP Holdtime  ATT/P/OL
rtr1.00-00*    0x00000009   0x568F        1188          0/0/0
rtrtwo.00-00   0x00000005   0xEC9B        444           0/0/0

IS-IS Level-2 Link State Database
LSPID          LSP Seq Num  LSP Checksum  LSP Holdtime  ATT/P/OL
rtr1.00-00*    0x00000010   0xF630        1193          0/0/0
rtrtwo.00-00   0x0000000C   0xF8DA        1188          0/0/0

host1#clear isis database
host1#show isis database
IS-IS Level-1 Link State Database
LSPID          LSP Seq Num  LSP Checksum  LSP Holdtime  ATT/P/OL

IS-IS Level-2 Link State Database
LSPID          LSP Seq Num  LSP Checksum  LSP Holdtime  ATT/P/OL

There is no no version.
See clear isis database

show clns

Use to display global CLNS information about the router.
Field descriptions
- Interfaces Enabled for CLNS—Number of interfaces that have the CLNS routing protocol enabled
- Configuration Timer—Interval (in seconds) after which the router sends out IS hello packets
- Default Holding Timer—Length of time (in seconds) that hello packets are remembered
- Packet Lifetime—Default value used in packets sourced by this router
- Intermediate system operation enabled (forwarding allowed)—Indicates whether this router is configured to be an ES or an IS
- IS-IS Level-1-2 Router—Shows whether IS-IS is running in this router, gives tag information, and shows whether it is running level 1 or level 1-2
- Routing for Area—ISO (NSAP) address for the network
- Distribute domain wide enabled—Indicates whether distribute-domain-wide is enabled
- Area Authentication—Displays the following fields if area authentication is enabled:
  - PSNP/CSNP PDU authentication enabled—Indicates whether authentication of level 1 PSNP packets and/or level 1 CSNP packets has been enabled by means of the area-authentication command
  - Key-id—Numeric identifier for the authentication key
  - Type—Type of authentication: hmac-md5 or password; an asterisk after the type indicates that the key is active
  - Start Accept—Date and time that the router starts accepting packets created with this password
  - Start Generate—Date and time that the router starts inserting this password into packets
  - Stop Accept—Date and time that the router stops accepting packets created with this password
  - Stop Generate—Date and time that the router stops inserting this password into packets
- Domain Authentication—Displays the following fields if domain authentication is enabled:
  - PSNP/CSNP PDU authentication enabled—Indicates whether authentication of level 2 PSNP packets and/or level 1 CSNP packets has been enabled by means of the domain-authentication command
  - Key-id—Numeric identifier for the authentication key
  - Type—Type of authentication: hmac-md5 or password; an asterisk after the type indicates that the key is active
  - Start Accept—Date and time that the router starts accepting packets created with this password
  - Start Generate—Date and time that the router starts inserting this password into packets
  - Stop Accept—Date and time that the router stops accepting packets created with this password
  - Stop Generate—Date and time that the router stops inserting this password into packets
Use the es-neighbors keyword to display information for IS-IS end-system adjacencies or the is-neighbors keyword to display information for IS-IS intermediate-system adjacencies. Neighbor entries are sorted according to the area in which they are located. The following fields are displayed when any of these keywords is used:
- System Id—Six-byte value of router
- Interface—Interface on which the router was discovered
- State—Adjacency state, either Up or Init
  - Up—Believes that the ES or IS is reachable
  - Init—Router is an IS and is waiting for an IS-IS hello message. IS-IS regards the neighbor as not adjacent.
- Type—Level 1, level 2, and level 1-2 type adjacencies
  - L1—Router adjacency for level 1 routing only
  - L1L2—Router adjacency for level 1 and level 2 routing
  - L2—Router adjacency for level 2 only
- Priority—IS-IS priority that the respective neighbor is advertising. The highest-priority neighbor becomes the designated IS-IS router for the interface.
- Circuit Id—Neighbor’s idea of what the designated IS-IS router is for the interface
Add the detail keyword to display area addresses and IP addresses.

Example 1—For IS-IS IP configuration

host1#show clns
Global CLNS Information:
  3 Interfaces Enabled for CLNS
  NET: 47.0005.80FF.F800.0000.0001.0001.0000.0000.3333.00
  Configuration Timer: 10, Default Holding Timer: 30, Packet Lifetime: 1200
  Intermediate system operation enabled
  IS-IS level-1-2 Router: testnet
    Routing for Area: 47.0005.80FF.F800.0000.0001.0001
  Distribution domain wide enabled
  Area Authentication:
  PSNP PDU authentication enabled 
    Key-id:   1 Type: hmac-md5
      Start Accept:   FRI JAN 14 09:57:41 2000
      Start Generate: FRI JAN 14 09:59:41 2000
      Stop Accept:    0
      Stop Generate:  0
  Domain Authentication:
  PSNP PDU authentication enabled 
  CSNP PDU authentication enabled 
    Key-id:   1 Type: hmac-md5*
      Start Accept:   WED JAN 12 19:01:52 2000
      Start Generate: WED JAN 12 19:03:52 2000
      Stop Accept:    0
      Stop Generate:  0

Example 2—For IS-IS IPv6 configuration

host1:2#show clns
Global CLNS Information:
  3 Interfaces Enabled for CLNS
  NET: 49.0001.0040.0400.4002.00
  Configuration Timer: 10, Default Holding Timer: 30, Packet Lifetime: 30
  Intermediate system operation enabled
  IS-IS level-1-2 Router:
    Routing for Area: 49.0001
Ip route-type both

Example 3—For IS-IS adjacencies

host1#show clns is-neighbors
System Id      Interface   State  Type Priority  Circuit Id
0000.0000.7500 atm2/0.111    up     L1L2 127        0000.0000.0000.00

Example 4—For detailed information on IS-IS adjacencies

host1#show clns is-neighbors detail
System Id      Interface  State Type Priority  Circuit Id
0000.0000.7500 atm2/0.111 up    L1L2 127       0000.0000.0000.00
  Area Address(es): 47.0005.80FF.F800.0000.0001.0001
  Ip Address(es):   172.30.245.33

See show clns

show clns interface

Use to display CLNS-specific information about each interface.
Field descriptions
- interface—Status of interface
- line protocol—Status of the line protocol, up or down
- Checksums—Status of checksum, enabled or disabled
- MTU—Maximum transmission size for a packet on this interface
- Encapsulation—Encapsulation used by CLNP packets on this interface
- Next ESH/ISH—When the next ES hello or IS hello is sent on this interface
- Routing Protocol—One or more areas that this interface is in. In most cases, an interface is in only one area.
- Circuit type—Whether the interface has been configured for local routing (level-1), area routing (level-2), or local and area routing (level-1-2)
- Interface number—Number of the interface
- local circuit ID—Local circuit ID of the interface
- Authentication Level-1—If area authentication is enabled, lists key-id, type of authentication, start and stop accept times, and start and stop generate times for the key. An asterisk after the type indicates the key is active.
- Authentication Level-2—If domain authentication is enabled, lists key-id, type of authentication, start and stop accept times, and start and stop generate times for the key. An asterisk after the type indicates the key is active.
- Level 1 and level 2 metrics—Metric value for each level
- DIS priority—DIS priority value assigned to the IS-IS router at each level
- Priority—Priority value assigned to the IS-IS router at each level
- Circuit ID—Circuit ID of the IS-IS router at each level
- Number of active level 1 and level 2 adjacencies—Number of adjacencies active at each level
- Designated IS—Name of the designated IS-IS router at each level
- Next IS-IS LAN level Hello—Amount of time (in seconds) before the next IS-IS LAN level 1 or level 2 hello message occurs
- BFD—State of BFD for IS-IS, enabled or disabled
- Mesh Group—Status of the mesh group, Active or Inactive
- LDP-IGP Synchronization—Status of synchronization, Achieved or Pending
When you specify the brief keyword, the output includes the following fields.
- interface—Name of the interface
- state—State of the interface, up or down
- level—Configured interface level, level-1, level-2, or level-1-2
- DIS(L-1)—Level-1 designated intermediate system (DIS) in a multiaccess network
- DIS(L-2)—Level-2 designated intermediate system (DIS) in a multiaccess network
- l1/l2 Metric—Metric for the interface

Example 1

host1#show clns interface
FastEthernet4/1 is up, line protocol is up
  Checksums Enabled, MTU 1500, Encapsulation SNAP
  Next ESH/ISH is 5 seconds
  Routing Protocol: IS-IS
    Circuit Type: level-1-2
    Interface number 0x10, local circuit ID 0x1
    Level-1 Metric: 10, DIS Priority: 0, Priority: 64,
            Circuit ID: 0000.0000.0000.01
         Designated IS: Getafix:v2.01 (us)
    Number of active level-1 adjacencies: 0
    
    Level-2 Metric: 10, DIS Priority: 0, Priority: 64,
            Circuit ID: 0000.0000.0000.01
         Designated IS: Getafix:v1.01 (Not Us)
    Number of active level-2 adjacencies: 1
    Next IS-IS LAN Level-1 Hello in 7 seconds
    Next IS-IS LAN Level-2 Hello in 6 seconds
    BFD disabled
    Mesh Group Inactive
                  LDP is configured through LDP autoconfig
                  LDP-IGP Synchronization: Achieved

Example 2

host1#show clns interface brief

                            
Clns Intf brief Table
--------------------
                            
                                                                   l1/l2
  interface     state    level       DIS(L-1)        DIS(L-2)      Metric
-------------   -----  ---------   -------------  --------------   ------
loopback1        up     level-1-2   Point to Point  Point to Point  10/10
ATM3/1.1         up     level-1-2   Point to Point  Point to Point  10/10
FastEthernet1/1  up     level-1-2   nemo:2.03       nemo:2.03       10/10
3 interfaces up in 3 interfaces

See show clns interface

show clns neighbors

Use to display information about ES and IS neighbors.
Use the detail keyword to display area addresses, IP addresses, and the ES or IS neighbor’s graceful restart capability and restarting state.
Field descriptions
- System Id—Six-byte value of router
- SNPA—Subnetwork point of attachment, which is the data link address; not meaningful for a point-to-point circuit
- Interface—Interface the router was learned from
- State—State of the ES or IS
  - Init—Router is an IS and is waiting for an IS-IS hello message. IS-IS regards the neighbor as not adjacent.
  - Up—ES or IS is considered reachable
- Holdtime(rem)—Remaining number of seconds before this adjacency entry times out
- Type—One of the following adjacency types:
  - ES—End-system adjacency either discovered by means of the ES-IS protocol or statically configured
  - IS—Router adjacency either discovered by means of the ES-IS protocol or statically configured
  - L1—Router adjacency for level 1 routing only
  - L1L2—Router adjacency for level 1 and level 2 routing
  - L2—Router adjacency for level 2 only
- Proto—Protocol through which the adjacency was learned. Valid protocol sources include ES-IS, IS-IS, and Static.
- Area Address(es)—Area addresses of the ES or IS
- Ip Address(es)—IP addresses of the ES or IS
- Graceful Restart Capable—Whether graceful restart is enabled (yes) or disabled (no) on the ES or IS
- Neighbor Restarting—Whether the ES or IS is currently restarting: yes or no
- BFD session—State of any BFD session for this neighbor

Example 1—For IS-IS IP configuration

host1#show clns neighbors detail
System Id       SNPA   Interface   State   Holdtime(rem)   Type   Proto
1111.1111.1111         A5/0.1      up      30(29)          L1L2   IS-IS
Area Address(es): 11.1111.1111.1111.1111.1111.1111
Ip Address(es): 172.100.11.1
Graceful Restart Capable: yes
Neighbor Restarting: yes
BFD session is not-up

Example 2—For IS-IS IPv6 configuration

host1:2#show clns neighbors detail 
System Id     SNPA            Interface   State  Holdtime(rem) Type Proto
host1:1      0090.1A41.081A    F1/1        up     30(25)        L1   IS-IS
  Area Address(es): 49.0001
  Ip Address(es):   4.4.4.1
  Graceful Restart Capable: no
  Neighbor Restarting: no
host1:3    0090.1A41.081C      F1/1        up     30(27)        L1   IS-IS
  Area Address(es): 49.0001
  Ip Address(es):   4.4.4.3
  Graceful Restart Capable: no
Neighbor Restarting: no

See show clns neighbors

show clns protocol

Use to display protocol-specific information about a routing process.
Field descriptions
- IS-IS Router—IS-IS router name
- System ID—Six-byte value of router
- IS-Type—Routing level (level 1, level 2, or both) that is enabled on the router
- Manual area addresses—Configured area addresses
- Routing for area address(es)—Identified for level 1 routing processes. For level 2 routing processes, lists the domain address.
- Interfaces supported by IS-IS—Interfaces and type
- Distance—Configured distance value
- Redistributing—Protocols being redistributed into IS-IS

Example

host1:2#show clns protocol
IS-IS Router:
  System Id: 0040.0400.4002.00  IS-Type: level-1-2
  Operational State: Up
  Manual area address(es):
        49.0001
  Routing for area address(es):
        49.0001
  Interfaces supported by IS-IS:
        loopback1 - IP
        FastEthernet1/1 - IP,IPv6
        ATM3/1.1 - IP, IPv6
  Distance: 115
  Redistributing:
        static

See show clns protocol

show clns traffic

Use to display all CLNS packets the router sees.
Use the optional delta keyword to specify that baselined statistics are to be shown.
Field descriptions
- IS-IS: Baseline last set—Time since the baseline was set
- IS-IS: Corrupted LSPs—Number of LSPs received with errors
- IS-IS: L1 LSP Database Overloads—Number of overloads in level 1
- IS-IS: L2 LSP Database Overloads—Number of overloads in level 2
- IS-IS: Area Addresses Dropped—Number of area addresses that the router dropped
- IS-IS: Attempts to Exceed Max Sequence—Number of sequence wraps over maximum
- IS-IS: Sequence Numbers Skipped—Number of LSPs received out of order
- IS-IS: Own LSPs Purged—Number of LSPs deleted
- IS-IS: Other LSPs Purged—Number of received LSPs deleted
- IS-IS: System ID Length Mismatches—Number of unmatched system ID lengths
- IS-IS: Maximum Area Mismatches—Number of rejected hellos due to area mismatches
- IS-IS: Area/Domain Authentication Failures—Number of authentication failures on received level 1 and level 2 LSP/SNPs
- IS-IS: Level-1 LSPs Sent Rcvd Dropped—Number of level 1 LSPs sent, received, and dropped
- IS-IS: Level-2 LSPs Sent Rcvd Dropped—Number of level 2 LSPs sent, received, and dropped
- IS-IS: LSP checksum errors received—Number of LSP checksum errors received
When you specify an interface, reports include the following additional fields:
- Interface—IS-IS interface for which details are displayed
- IS-IS: Protocol PDUs (in/out)—Number of packets in/out on interface
- IS-IS: Init Failures—Number of rejected hellos on interface
- IS-IS: Adjacencies Changes—Number of times adjacencies have transitioned from down to up
- IS-IS: Adjacencies Rejected—Number of times hellos are rejected because of an incompatibility
- IS-IS: Bad LSPs—Number of LSPs received with errors
- IS-IS: Level-1 Designated IS Changes—Number of times the level 1 designated router has changed
- IS-IS: Level-2 Designated IS Changes—Number of times the level 2 designated router has changed
- IS-IS: Invalid 9542s—Number of rejected ES hello packets
- IS-IS: Malformed PDUs received—Number of malformed packets received
- IS-IS: Authentication Failures—Number of authentication failures on received level 1 and level 2 hello packets
When you specify the detail keyword, the output includes the following additional fields that show packet statistics and LSP statistics. The hello, CSNP, and PSNP statistics are shown only when you issue the detail keyword. When the interface is Ethernet, L1 and L2 hello counts are displayed; otherwise the point-to-point hello count is displayed.
- IS-IS: Level-1 Hellos (in/out/dropped)—Number of level 1 hellos received, sent, and dropped
- IS-IS: Level-2 Hellos (in/out/dropped)—Number of level 2 hellos received, sent, and dropped
- IS-IS: Level-1 CSNPs (in/out)—Number of level 1 CSNPs received and sent on the interface
- IS-IS: Level-2 CSNPs (in/out)—Number of level 2 CSNPs received and sent on the interface
- IS-IS: Level-1 PSNPs (in/out)—Number of level 1 PSNPs received and sent on the interface
- IS-IS: Level-2 PSNPs (in/out)—Number of level 2 PSNPs received and sent on the interface
- IS-IS: LSP Retransmissions—Number of LSPs retransmitted on the interface

Example 1

host1#show clns traffic
IS-IS: Baseline last set 0 days, 21 hours, 12 minutes, 15 seconds
IS-IS: Corrupted LSPs: 0
IS-IS: L1 LSP Database Overloads: 0
IS-IS: L2 LSP Database Overloads: 0
IS-IS: Area Addresses Dropped: 0
IS-IS: Attempts to Exceed Max Sequence: 0
IS-IS: Sequence Numbers Skipped: 5
IS-IS: Own LSPs Purged: 0
IS-IS: Other LSPs Purged: 0
IS-IS: System ID Length Mismatches: 0
IS-IS: Maximum Area Mismatches: 0
IS-IS: Area/Domain Authentication Failures: 0
IS-IS: Level-1 LSPs Sent: 1 Rcvd: 6769 Dropped: 6769
IS-IS: Level-2 LSPs Sent: 1 Rcvd: 6769 Dropped: 6769
IS-IS: LSP checksum errors received: 0

Example 2

host1#show clns traffic fastEthernet 4/0 detail
Interface: FastEthernet4/0
IS-IS: Baseline last set 5 days, 0 hours, 3 minutes, 31 seconds
IS-IS: Protocol PDUs (in/out): 10421/5862
IS-IS: Level-1 Hellos (in/out/dropped): 610046/610456/0
IS-IS: Level-2 Hellos (in/out/dropped): 610046/610456/0
IS-IS: Level-1 CSNPs (in/out): 0/0
IS-IS: Level-2 CSNPs (in/out): 0/0
IS-IS: Level-1 PSNPs (in/out): 0/0
IS-IS: Level-2 PSNPs (in/out): 0/0
IS-IS: Init Failures: 0
IS-IS: Adjacencies Changes: 1
IS-IS: Adjacencies Rejected: 0
IS-IS: Bad LSPs: 0
IS-IS: LSP Retransmissions: 0
IS-IS: Level-1 Designated IS Changes: 1
IS-IS: Level-2 Designated IS Changes: 1
IS-IS: Invalid 9542s: 0
IS-IS: Malformed PDU received: 0
IS-IS: Authentication Failures: 0

Example 3

host1#show clns traffic detail
IS-IS: Baseline last set 5 days, 0 hours, 3 minutes, 31 seconds
IS-IS: Corrupted LSPs: 0
IS-IS: L1 LSP Database Overloads: 0
IS-IS: L2 LSP Database Overloads: 0
IS-IS: Area Addresses Dropped: 0
IS-IS: Attempts to Exceed Max Sequence: 0
IS-IS: Sequence Numbers Skipped: 0
IS-IS: Own LSPs Purged: 0
IS-IS: Other LSPs Purged: 0
IS-IS: System ID Length Mismatches: 0
IS-IS: Maximum Area Mismatches: 0
IS-IS: Area/Domain Authentication Failures: 0
IS-IS: Level-1 LSPs Sent: 1 Rcvd: 6769 Dropped: 6769
IS-IS: Level-2 LSPs Sent: 1 Rcvd: 6769 Dropped: 6769
IS-IS: LSP checksum errors received: 0

Interface: FastEthernet4/0
IS-IS: Baseline last set 5 days, 0 hours, 3 minutes, 31 seconds
IS-IS: Protocol PDUs (in/out): 10421/5862
IS-IS: Level-1 Hellos (in/out/dropped): 610046/610456/0
IS-IS: Level-2 Hellos (in/out/dropped): 610046/610456/0
IS-IS: Level-1 CSNPs (in/out): 0/0
IS-IS: Level-2 CSNPs (in/out): 0/0
IS-IS: Level-1 PSNPs (in/out):0/0
IS-IS: Level-2 PSNPs (in/out):0/0
IS-IS: Init Failures: 0
IS-IS: Adjacencies Changes: 1
IS-IS: Adjacencies Rejected: 0
IS-IS: Bad LSPs: 0
IS-IS: LSP Retransmissions: 0
IS-IS: Level-1 Designated IS Changes: 1
IS-IS: Level-2 Designated IS Changes: 1
IS-IS: Invalid 9542s: 0
IS-IS: Malformed PDU received: 0
IS-IS: Authentication Failures: 0

Interface: FastEthernet4/1
IS-IS: Baseline last set 5 days, 0 hours, 3 minutes, 31 seconds
IS-IS: Protocol PDUs (in/out): 10421/5862
IS-IS: Level-1 Hellos (in/out/dropped): 609946/610056/0
IS-IS: Level-2 Hellos (in/out/dropped): 609946/610056/0
IS-IS: Level-1 CSNPs (in/out): 0/0
IS-IS: Level-2 CSNPs (in/out): 0/0
IS-IS: Level-1 PSNPs (in/out):0/0
IS-IS: Level-2 PSNPs (in/out):0/0
IS-IS: Init Failures: 0
IS-IS: Adjacencies Changes: 1
IS-IS: Adjacencies Rejected: 0
IS-IS: Bad LSPs: 0
IS-IS: LSP Retransmissions: 0
IS-IS: Level-1 Designated IS Changes: 1
IS-IS: Level-2 Designated IS Changes: 1
IS-IS: Invalid 9542s: 0
IS-IS: Malformed PDU received: 0
IS-IS: Authentication Failures: 0

See show clns traffic