Debugging Is-Is - Dell C9000 Series Networking Configuration Manual

Example of Viewing the Overload Bit Setting
When the bit is set, a 1 is placed in the OL column in the show isis database command output. The
overload bit is set in both the Level-1 and Level-2 database because the IS type for the router is Level-1-2.
Dell#show isis database
IS-IS Level-1 Link State Database
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
B233.00-00 0x00000003
eljefe.00-00 * 0x0000000A
eljefe.01-00 * 0x00000001
eljefe.02-00 * 0x00000001
Force10.00-00 0x00000002
IS-IS Level-2 Link State Database
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
B233.00-00 0x00000006
eljefe.00-00 * 0x0000000E
eljefe.01-00 * 0x00000001
eljefe.02-00 * 0x00000001
Force10.00-00 0x00000004
Dell#

Debugging IS-IS

To debug IS-IS processes, use the following commands.
• View all IS-IS information.
EXEC Privilege mode
debug isis
• View information on all adjacency-related activity (for example, hello packets that are sent and received).
EXEC Privilege mode
debug isis adj-packets [interface]
To view specific information, enter the following optional parameter:
• interface: Enter the type of interface and slot/port information to view IS-IS information on that
interface only.
• View information about IS-IS local update packets.
EXEC Privilege mode
debug isis local-updates [interface]
To view specific information, enter the following optional parameter:
• interface: Enter the type of interface and slot/port information to view IS-IS information on that
interface only.
• View IS-IS SNP packets, include CSNPs and PSNPs.
EXEC Privilege mode
debug isis snp-packets [interface]
To view specific information, enter the following optional parameter:
0x07BF 1074
0xF963 1196
0x68DF 1108
0x2E7F 1099
0xD1A7 1088
0xC38A 1110
0x53BF 1196
0x68DF 1108
0x2E7F 1099
0xCDA9 1093
Intermediate System to Intermediate System
0/0/0
0/0/1
0/0/0
0/0/0
0/0/0
0/0/0
0/0/1
0/0/0
0/0/0
0/0/0
602