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Example: SCU Configuration

Example: SCU Configuration

Figure 1: SCU Topology Diagram

Image g017169.gif

Figure 1 shows a basic SCU configuration with three routers. Source routers A and B use loopback addresses as the prefixes to be monitored. Most of the configuration tasks and actual monitoring occurs on transit Router SCU.

Begin your configuration on Router A. The loopback address on Router A contains the origin of the prefix that is to be assigned to source class A on Router SCU. However, no SCU processing happens on this router. Therefore, configure Router A for basic OSPF routing and include your loopback interface and interface so-0/0/2 in the OSPF process.

Router A:

[edit]interfaces {so-0/0/2 {unit 0 {family inet {address 10.255.50.2/24;}}}lo0 {unit 0 {family inet {address 10.255.192.10/32;}}}}protocols {ospf {area 0.0.0.0 {interface so-0/0/2.0;interface lo0.0;}}}

Router SCU handles the bulk of the activity in this example. On Router SCU, enable source class usage on the inbound and outbound interfaces at the [edit interfaces interface-name unit unit-number family inet accounting] hierarchy level. Make sure you specify the expected traffic: input, output, or, in this case, both.

Next, configure a route filter policy statement that matches the prefixes of the loopback addresses from routers A and B. Include statements in the policy that classify packets from Router A in one group named scu-class-a and packets from Router B in a second class named scu-class-b. Notice the efficient use of a single policy containing multiple terms.

Last, apply the policy to the forwarding table.

Router SCU

[edit]interfaces {so-0/0/1 {unit 0 {family inet {accounting {source-class-usage {input;output;}}address 10.255.50.1/24;}}}so-0/0/3 {unit 0 {family inet {accounting {source-class-usage {input;output;}}address 10.255.10.3/24;}}}lo0 {unit 0 {family inet {address 10.255.6.111/32;}}}}protocols {ospf {area 0.0.0.0 {interface so-0/0/1.0;interface so-0/0/3.0;}}}routing-options {forwarding-table {export scu-policy;}}policy-options {policy-statement scu-policy {term 0 {from {route-filter 10.255.192.0/24 orlonger;}then source-class scu-class-a;}term 1 {from {route-filter 10.255.165.0/24 orlonger;}then source-class scu-class-b;}}}

Complete the configuration tasks on Router B. Just as Router A provides a source prefix, Router B’s loopback address matches the prefix assigned to scu-class-b on Router SCU. Again, no SCU processing happens on this router, so configure Router B for basic OSPF routing and include your loopback interface and interface so-0/0/4 in the OSPF process.

Router B:

[edit]interfaces {so-0/0/4 {unit 0 {family inet {address 10.255.10.4/24;}}}lo0 {unit 0 {family inet {address 10.255.165.226/32;}}}}protocols {ospf {area 0.0.0.0 {interface so-0/0/4.0;interface lo0.0;}}}

Verifying Your Work

To verify that SCU is functioning properly, use the following commands:

  • show interfaces interface-name statistics
  • show interfaces interface-name (extensive | detail)
  • show route (extensive | detail)
  • show interfaces source-class source-class-name interface-name
  • clear interface interface-name statistics

You should always verify SCU statistics at the outbound SCU interface on which you configured the output statement. You can perform the following three steps to check the functionality of SCU:

  1. Clear all counters on your SCU-enabled router and verify that they are empty.
  2. Send a ping from one edge router to another edge router to generate SCU traffic across the SCU-enabled router.
  3. Verify that the counters are incrementing correctly on the outbound interface.

The following section shows the output of these commands as used with the configuration example.


user@scu> clear interfaces statistics all
user@scu>  show interfaces so-0/0/1.0 statistics
  Logical interface so-0/0/1.0 (Index 4) (SNMP ifIndex 119) 
    Flags: Point-To-Point SNMP-Traps Encapsulation: PPP
    Protocol inet, MTU: 4470
      Source class                             Packets                Bytes
                       scu-class-a                    0                    0
                      scu-class-b                    0                    0
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.255.50/24, Local: 10.255.50.1

user@scu> show interfaces so-0/0/3.0 statistics
  Logical interface so-0/0/3.0 (Index 6) (SNMP ifIndex 113) 
    Flags: Point-To-Point SNMP-Traps Encapsulation: PPP
    Protocol inet, MTU: 4470
      Source class                             Packets                Bytes
                      scu-class-a                    0                    0
                      scu-class-b                    0                    0
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.255.10/24, Local: 10.255.10.3

user@scu> show interfaces source-class scu-class-a so-0/0/3.0
    Protocol inet
      Source class                             Packets                Bytes
                      scu-class-a                    0                    0

user@scu> show interfaces source-class scu-class-b so-0/0/1.0
    Protocol inet
      Source class                             Packets                Bytes
                      scu-class-b                    0                    0

user@routerB> ping 10.255.192.10 source 10.255.165.226 rapid 10000

user@routerA> ping 10.255.165.226 source 10.255.192.10 rapid 10000

user@scu> show interfaces source-class scu-class-a so-0/0/3.0
    Protocol inet
      Source class                             Packets                Bytes
                      scu-class-a                20000              1680000

user@scu> show interfaces source-class scu-class-a so-0/0/1.0
    Protocol inet
      Source class                             Packets                Bytes
                      scu-class-b                20000              1680000

user@scu> show interfaces so-0/0/3.0 statistics
  Logical interface so-0/0/3.0 (Index 6) (SNMP ifIndex 113)
    Flags: Point-To-Point SNMP-Traps Encapsulation: PPP
    Protocol inet, MTU: 4470
      Source class                             Packets                Bytes
                      scu-class-a                20000              1680000
                      scu-class-b                    0                    0
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.255.10/24, Local: 10.255.10.3

user@scu> show interfaces so-0/0/1.0 statistics
  Logical interface so-0/0/1.0 (Index 4) (SNMP ifIndex 119)
    Flags: Point-To-Point SNMP-Traps Encapsulation: PPP
    Protocol inet, MTU: 4470
      Source class                             Packets                Bytes
                      scu-class-a                    0                    0
                      scu-class-b                20000              1680000
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.255.50/24, Local: 10.255.50.1

 


user@scu> show route extensive 10.255.192.0
inet.0: 26 destinations, 28 routes (25 active, 0 holddown, 1 hidden)
10.255.192.0/18 (1 entry, 1 announced)
TSI:
KRT in-kernel 10.255.192.0/18 -> {so-0/0/1.0}
Source class: scu-class-a
        *OSPF   Preference: 150
                Next hop: via so-0/0/1.0, selected
                State: <Active Int Ext>
                Age: 2:49:31  Metric: 0  Tag: 0 
                Task: OSPF
                Announcement bits (1): 0-KRT 
                AS path: I

 


user@scu> show route extensive 10.255.165.0
inet.0: 26 destinations, 28 routes (25 active, 0 holddown, 1 hidden)
10.255.165.0/20 (1 entry, 1 announced)
TSI:
KRT in-kernel 10.255.165.0/20 -> {so-0/0/3.0}
Source class: scu-class-b
        *OSPF   Preference: 150
                Next hop: via so-0/0/3.0, selected
                State: <Active Int Ext>
                Age: 2:49:31  Metric: 0  Tag: 0 
                Task: OSPF
                Announcement bits (1): 0-KRT 
                AS path: I

 


user@scu> show interfaces so-0/0/1 detail
Physical interface: so-0/0/1, Enabled, Physical link is Up
  Interface index: 12, SNMP ifIndex: 17, Generation: 11
  Link-level type: PPP, MTU: 4474, Clocking: Internal, SONET mode, Speed: OC3,
  Loopback: None, FCS: 16, Payload scrambler: Enabled
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : Keepalives
  Hold-times     : Up 0 ms, Down 0 ms
  Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3
  Keepalive statistics:
    Input : 46 (last seen 00:00:01 ago)
    Output: 45 (last sent 00:00:00 ago)
  LCP state: Opened
  NCP state: inet: Opened, inet6: Not-configured, iso: Not-configured, mpls:
  Not-configured
  CHAP state: Not-configured
  Last flapped   : 2002-04-19 11:49:22 PDT (03:10:09 ago)
  Statistics last cleared: 2002-04-19 14:52:04 PDT (00:07:27 ago)
  Traffic statistics:
   Input  bytes  :              1689276                   40 bps
   Output bytes  :              1689747                   48 bps
   Input  packets:                20197                    0 pps
   Output packets:                20200                    0 pps
  Queue counters:       Queued packets  Transmitted packets      Dropped packets
    0 best-effort                20053                20053                    0
    1 expedited-fo                   0                    0                    0
    2 assured-forw                   0                    0                    0
    3 network-cont                 146                  146                    0
  SONET alarms   : None
  SONET defects  : None
  Logical interface so-0/0/1.0 (Index 4) (SNMP ifIndex 119) (Generation 3)
    Flags: Point-To-Point SNMP-Traps Encapsulation: PPP
    Protocol inet, MTU: 4470          
      Flags: SCU-in, SCU-out
    Generation: 6 Route table: 0
       Source class                             Packets                Bytes
                      scu-class-a                    0                    0
                      scu-class-b                20000              1680000
      Filters: Input: icmp-so-0/0/1.0-i, Output: icmp-so-0/0/1.0-o
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.255.50/24, Local: 10.255.50.1, Broadcast: Unspecified,
        Generation: 8

user@scu>  show interfaces so-0/0/1 extensive
Physical interface: so-0/0/1, Enabled, Physical link is Up
  Interface index: 12, SNMP ifIndex: 17, Generation: 11
  Link-level type: PPP, MTU: 4474, Clocking: Internal, SONET mode, Speed: OC3,
  Loopback: None, FCS: 16, Payload scrambler: Enabled
  Device flags   : Present Running
  Interface flags: Point-To-Point SNMP-Traps
  Link flags     : Keepalives
  Hold-times     : Up 0 ms, Down 0 ms
  Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3
  Keepalive statistics:
    Input : 51 (last seen 00:00:04 ago)
    Output: 50 (last sent 00:00:05 ago)
  LCP state: Opened
  NCP state: inet: Opened, inet6: Not-configured, iso: Not-configured, mpls:
  Not-configured
  CHAP state: Not-configured
  Last flapped   : 2002-04-19 11:49:22 PDT (03:11:05 ago)
  Statistics last cleared: 2002-04-19 14:52:04 PDT (00:08:23 ago)
  Traffic statistics:
   Input  bytes  :              1689884                  264 bps
   Output bytes  :              1690388                  280 bps
   Input  packets:                20215                    0 pps
   Output packets:                20217                    0 pps
  Input errors:
    Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Giants: 0,
    Bucket drops: 0, Policed discards: 0, L3 incompletes: 0,
    L2 channel errors: 0, L2 mismatch timeouts: 0, HS link CRC errors: 0,
    HS link FIFO overflows: 0
  Output errors:
    Carrier transitions: 0, Errors: 0, Drops: 0, Aged packets: 0,
    HS link FIFO underflows: 0
  Queue counters:       Queued packets  Transmitted packets      Dropped packets
    0 best-effort                20053                20053                    0
    1 expedited-fo                   0                    0                    0
    2 assured-forw                   0                    0                    0                 
    3 network-cont                 164                  164                    0
  SONET alarms   : None
  SONET defects  : None
  SONET PHY:            Seconds        Count  State
    PLL Lock                  0            0  OK
    PHY Light                 0            0  OK
  SONET section:
    BIP-B1                    0            0
    SEF                       0            0  OK
    LOS                       0            0  OK
    LOF                       0            0  OK
    ES-S                      0
    SES-S                     0
    SEFS-S                    0
  SONET line:
    BIP-B2                    0            0
    REI-L                     0            0
    RDI-L                     0            0  OK
    AIS-L                     0            0  OK
    BERR-SF                   0            0  OK
    BERR-SD                   0            0  OK
    ES-L                      0
    SES-L                     0
    UAS-L                     0
    ES-LFE                    0
    SES-LFE                   0
    UAS-LFE                   0
  SONET path:
    BIP-B3                    0            0
    REI-P                     0            0
    LOP-P                     0            0  OK
    AIS-P                     0            0  OK
    RDI-P                     0            0  OK
    UNEQ-P                    0            0  OK
    PLM-P                     0            0  OK
    ES-P                      0
    SES-P                     0
    UAS-P                     0                    
    ES-PFE                    0
    SES-PFE                   0
    UAS-PFE                   0
  Received SONET overhead:
    F1      : 0x00, J0      : 0x00, K1      : 0x00, K2      : 0x00
    S1      : 0x00, C2      : 0xcf, C2(cmp) : 0xcf, F2      : 0x00
    Z3      : 0x00, Z4      : 0x00, S1(cmp) : 0x00, V5      : 0x00
    V5(cmp) : 0x00
  Transmitted SONET overhead:
    F1      : 0x00, J0      : 0x01, K1      : 0x00, K2      : 0x00
    S1      : 0x00, C2      : 0xcf, F2      : 0x00, Z3      : 0x00
    Z4      : 0x00, V5      : 0x00
  Received path trace: e so-0/0/1
    65 20 73 6f 2d 30 2f 30 2f 31 00 00 00 00 00 00   e so-0/0/1......
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 0d 0a   ................
  Transmitted path trace: scu so-0/0/1
    67 68 62 20 73 6f 2d 30 2f 30 2f 31 00 00 00 00   scu so-0/0/1....
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................
  HDLC configuration:
    Policing bucket: Disabled
    Shaping bucket : Disabled
    Giant threshold: 4484, Runt threshold: 3
  Packet Forwarding Engine configuration:
    Destination slot: 0, PLP byte: 1 (0x00)
    CoS transmit queue          Bandwidth          Buffer     Priority   Limit
                              %          bps   %        bytes
    0 best-effort             0            0   0            0      low    none
    1 expedited-forwarding    0            0   0            0      low    none
    2 assured-forwarding      0            0   0            0      low    none
    3 network-control         0            0   0            0      low    none
  Logical interface so-0/0/1.0 (Index 4) (SNMP ifIndex 119) (Generation 3)
    Flags: Point-To-Point SNMP-Traps Encapsulation: PPP
    Protocol inet, MTU: 4470
      Flags: SCU-in, SCU-out
    Generation: 6 Route table: 0
       Source class                             Packets                Bytes
                      scu-class-a                    0                    0
                      scu-class-b                20000              1680000
      Filters: Input: icmp-so-0/0/1.0-i, Output: icmp-so-0/0/1.0-o
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.255.50/24, Local: 10.255.50.1, Broadcast: Unspecified,
        Generation: 8

Published: 2010-04-15

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