Reference Guide

To view all interfaces configured with IS-IS routing along with the defaults, use the show isis interface command in
EXEC Privilege mode.
Dell#show isis interface G1/34
GigabitEthernet 2/10 is up, line protocol is up
MTU 1497, Encapsulation SAP
Routing Protocol: IS-IS
Circuit Type: Level-1-2
Interface Index 0x62cc03a, Local circuit ID 1
Level-1 Metric: 10, Priority: 64, Circuit ID: 0000.0000.000B.01
Hello Interval: 10, Hello Multiplier: 3, CSNP Interval: 10
Number of active level-1 adjacencies: 1
Level-2 Metric: 10, Priority: 64, Circuit ID: 0000.0000.000B.01
Hello Interval: 10, Hello Multiplier: 3, CSNP Interval: 10
Number of active level-2 adjacencies: 1
Next IS-IS LAN Level-1 Hello in 4 seconds
Next IS-IS LAN Level-2 Hello in 6 seconds
LSP Interval: 33 Next IS-IS LAN Level-1 Hello in 4 seconds
Next IS-IS LAN Level-2 Hello in 6 seconds
LSP Interval: 33
Restart Capable Neighbors: 2, In Start: 0, In Restart: 0
Dell#
Changing LSP Attributes
IS-IS routers flood link state PDUs (LSPs) to exchange routing information. LSP attributes include the generation interval,
maximum transmission unit (MTU) or size, and the refresh interval.
You can modify the LSP attribute defaults, but it is not necessary.
To change the defaults, use any or all of the following commands.
● Set interval between LSP generation.
ROUTER ISIS mode
lsp-gen-interval [level-1 | level-2] seconds
○ seconds: the range is from 0 to 120.
The default is 5 seconds.
The default level is Level 1.
● Set the LSP size.
ROUTER ISIS mode
lsp-mtu size
○ size: the range is from 128 to 9195.
The default is 1497.
● Set the LSP refresh interval.
ROUTER ISIS mode
lsp-refresh-interval seconds
○ seconds: the range is from 1 to 65535.
The default is 900 seconds.
● Set the maximum time LSPs lifetime.
ROUTER ISIS mode
max-lsp-lifetime seconds
○ seconds: the range is from 1 to 65535.
The default is 1200 seconds.
To view the configuration, use the show config command in ROUTER ISIS mode or the show running-config isis
command in EXEC Privilege mode.
Intermediate System to Intermediate System
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