Step 1: Display Detailed IS-IS Protocol Information

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Step 1: Display Detailed IS-IS Protocol Information
Action

To trace IS-IS messages in detail, follow these steps:
In configuration mode, go to the following hierarchy level:
[edit]
user@host# edit protocols isis traceoptions
Configure the flag to display detailed IS-IS protocol messages:
[edit protocols isis traceoptions] 
user@host# set flag hello detail 
Verify the configuration:
user@host# show
For example:
[edit protocols isis traceoptions]
user@host# show 
file isislog size 10k files 10;
flag hello detail;
Commit the configuration:
user@host# commit
View the contents of the file containing the detailed messages:
user@host# run show log filename
For example:
user@host# run show log isislog
Nov 29 23:17:50 trace_on: Tracing to "/var/log/isislog" started
Nov 29 23:17:50 Sending PTP IIH on so-1/1/1.0
Nov 29 23:17:53 Sending PTP IIH on so-1/1/0.0
Nov 29 23:17:54 Received PTP IIH, source id abc-core-01 on so-1/1/0.0
Nov 29 23:17:54     from interface index 11
Nov 29 23:17:54     max area 0, circuit type l2, packet length 4469
Nov 29 23:17:54     hold time 30, circuit id 6
Nov 29 23:17:54     neighbor state up
Nov 29 23:17:54     speaks IP
Nov 29 23:17:54     area address 99.0008 (1)
Nov 29 23:17:54     IP address 10.10.10.29
Nov 29 23:17:54     4396 bytes of total padding
Nov 29 23:17:54     updating neighbor abc-core-01
Nov 29 23:17:55 Received PTP IIH, source id abc-core-02 on so-1/1/1.0
Nov 29 23:17:55     from interface index 12
Nov 29 23:17:55     max area 0, circuit type l2, packet length 4469
Nov 29 23:17:55     hold time 30, circuit id 6
Nov 29 23:17:55     neighbor state up
Nov 29 23:17:55     speaks IP
Nov 29 23:17:55     area address 99.0000 (1)
Nov 29 23:17:55     IP address 10.10.10.33
Nov 29 23:17:55     4396 bytes of total padding
Nov 29 23:17:55     updating neighbor abc-core-02
What It Means

Table 56 lists tracing flags that can be configured specific to IS-IS and presents example output for some of the flags.

Table 56: IS-IS Protocol Tracing Flags

Tracing Flags

Description

Example Output

csn

Complete sequence number PDU (CSNP)

Nov 28 20:02:48 Sending L2 CSN on interface so-1/1/0.0 Nov 28 20:02:48 Sending L2 CSN on interface so-1/1/1.0

With the detail option.

Nov 28 20:06:08 Sending L2 CSN on interface so-1/1/1.0 Nov 28 20:06:08 LSP abc-core-01.00-00 lifetime 1146 Nov 28 20:06:08 sequence 0x1c4f8 checksum 0xa1e9 Nov 28 20:06:08 LSP abc-core-02.00-00 lifetime 411 Nov 28 20:06:08 sequence 0x7435 checksum 0x5424 Nov 28 20:06:08 LSP abc-brdr-01.00-00 lifetime 465 Nov 28 20:06:08 sequence 0xf73 checksum 0xab10 Nov 28 20:06:08 LSP abc-edge-01.00-00 lifetime 1089 Nov 28 20:06:08 sequence 0x1616 checksum 0xdb29 Nov 28 20:06:08 LSP abc-edge-02.00-00 lifetime 1103 Nov 28 20:06:08 sequence 0x45cc checksum 0x6883

hello

Hello packet

Nov 28 20:13:50 Sending PTP IIH on so-1/1/1.0 Nov 28 20:13:50 Received PTP IIH, source id abc-core-01 on so-1/1/0.0 Nov 28 20:13:53 Received PTP IIH, source id abc-core-02 on so-1/1/1.0 Nov 28 20:13:57 Sending PTP IIH on so-1/1/0.0 Nov 28 20:13:58 Received PTP IIH, source id abc-core-01 on so-1/1/0.0 Nov 28 20:13:59 Sending PTP IIH on so-1/1/1.0

lsp

Link-state PDU (LSP) packets

Nov 28 20:15:46 Received L2 LSP abc-edge-01.00-00, interface so-1/1/0.0 Nov 28 20:15:46 from abc-core-01 Nov 28 20:15:46 sequence 0x1617, checksum 0xd92a, lifetime 1197 Nov 28 20:15:46 Updating L2 LSP abc-edge-01.00-00 in TED Nov 28 20:15:47 Received L2 LSP abc-edge-01.00-00, interface so-1/1/1.0 Nov 28 20:15:47 from abc-core-02 Nov 28 20:15:47 sequence 0x1617, checksum 0xd92a, lifetime 1197

lsp-generation

LSP generation packets

Nov 28 20:21:24 Regenerating L1 LSP abc-edge-03.00-00, old sequence 0x682 Nov 28 20:21:27 Rebuilding L1, fragment abc-edge-03.00-00 Nov 28 20:21:27 Rebuilt L1 fragment abc-edge-03.00-00, size 59 Nov 28 20:31:52 Regenerating L2 LSP abc-edge-03.00-00, old sequence 0x689 Nov 28 20:31:54 Rebuilding L2, fragment abc-edge-03.00-00 Nov 28 20:31:54 Rebuilt L2 fragment abc-edge-03.00-00, size 256 Nov 28 20:34:05 Regenerating L1 LSP abc-edge-03.00-00, old sequence 0x683 Nov 28 20:34:08 Rebuilding L1, fragment abc-edge-03.00-00 Nov 28 20:34:08 Rebuilt L1 fragment abc-edge-03.00-00, size 59

packets

All IS-IS protocol packets

Not available.

psn

Partial sequence number PDU (PSNP) packets

Nov 28 20:40:39 Received L2 PSN, source abc-core-01, interface so-1/1/0.0 Nov 28 20:40:39 Received L2 PSN, source abc-core-02, interface so-1/1/1.0 Nov 28 20:41:36 Sending L2 PSN on interface so-1/1/1.0 Nov 28 20:41:36 Sending L2 PSN on interface so-1/1/0.0 Nov 28 20:42:35 Received L2 PSN, source abc-core-02, interface so-1/1/1.0 Nov 28 20:42:35 LSP abc-edge-03.00-00 lifetime 1196 Nov 28 20:42:35 sequence 0x68c checksum 0x746d Nov 28 20:42:35 Received L2 PSN, source abc-core-01, interface so-1/1/0.0 Nov 28 20:42:35 LSP abc-edge-03.00-00 lifetime 1196 Nov 28 20:42:35 sequence 0x68c checksum 0x746d Nov 28 20:42:49 Sending L2 PSN on interface so-1/1/1.0 Nov 28 20:42:49 LSP abc-core-01.00-00 lifetime 1197 Nov 28 20:42:49 sequence 0x1c4fb checksum 0x9bec Nov 28 20:42:49 Sending L2 PSN on interface so-1/1/0.0 Nov 28 20:42:49 LSP abc-core-01.00-00 lifetime 1197 Nov 28 20:42:49 sequence 0x1c4fb checksum 0x9bec

spf

Shortest path first (SPF) calculations

Nov 28 20:44:01 Scheduling SPF for L1: Reconfig Nov 28 20:44:01 Scheduling multicast SPF for L1: Reconfig Nov 28 20:44:01 Scheduling SPF for L2: Reconfig Nov 28 20:44:01 Scheduling multicast SPF for L2: Reconfig Nov 28 20:44:02 Running L1 SPF Nov 28 20:44:02 L1 SPF initialization complete: 0.000099s cumulative time Nov 28 20:44:02 L1 SPF primary processing complete: 0.000303s cumulative time Nov 28 20:44:02 L1 SPF result postprocessing complete: 0.000497s cumulative time Nov 28 20:44:02 L1 SPF RIB postprocessing complete: 0.000626s cumulative time Nov 28 20:44:02 L1 SPF routing table postprocessing complete: 0.000736s cumulative time

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