Reference Guide

domain-password [encryption-type | hmac-md5] password
FTOS supports both DES and HMAC-MD5 authentication methods.
This password is inserted in Level 2 LSPs, Complete SNPs, and Partial SNPs.
To view the passwords, use the show config command in ROUTER ISIS mode or the show running-config isis
command in EXEC Privilege mode.
To remove a password, use either the no area-password or no domain-password commands in ROUTER ISIS mode.
Setting the Overload Bit
Another use for the overload bit is to prevent other routers from using this router as an intermediate hop in their shortest path
first (SPF) calculations. For example, if the IS-IS routing database is out of memory and cannot accept new LSPs, the system
sets the overload bit and IS-IS traffic continues to transit the system.
To set or remove the overload bit manually, use the following commands.
● Set the overload bit in LSPs.
ROUTER ISIS mode
set-overload-bit
This setting prevents other routers from using it as an intermediate hop in their shortest path first (SPF) calculations.
● Remove the overload bit.
ROUTER ISIS mode
no set-overload-bit
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 0x07BF 1074 0/0/0
eljefe.00-00 * 0x0000000A 0xF963 1196 0/0/1
eljefe.01-00 * 0x00000001 0x68DF 1108 0/0/0
eljefe.02-00 * 0x00000001 0x2E7F 1099 0/0/0
Force10.00-00 0x00000002 0xD1A7 1088 0/0/0
IS-IS Level-2 Link State Database
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
B233.00-00 0x00000006 0xC38A 1110 0/0/0
eljefe.00-00 * 0x0000000E 0x53BF 1196 0/0/1
eljefe.01-00 * 0x00000001 0x68DF 1108 0/0/0
eljefe.02-00 * 0x00000001 0x2E7F 1099 0/0/0
Force10.00-00 0x00000004 0xCDA9 1093 0/0/0
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.
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Intermediate System to Intermediate System