Reference Guide

Changing the IS-Type
To change the IS-type, use the following commands.
You can configure the system to act as a Level 1 router, a Level 1-2 router, or a Level 2 router.
To change the IS-type for the router, use the following commands.
● Configure IS-IS operating level for a router.
ROUTER ISIS mode
is-type {level-1 | level-1-2 | level-2-only}
Default is level-1-2.
● Change the IS-type for the IS-IS process.
ROUTER ISIS mode
is-type {level-1 | level-1-2 | level-2}
To view which IS-type is configured, use the show isis protocol command in EXEC Privilege mode. The show config
command in ROUTER ISIS mode displays only non-default information, so if you do not change the IS-type, the default value
(level-1-2) is not displayed.
The default is Level 1-2 router. When the IS-type is Level 1-2, the software maintains two Link State databases, one for each
level. To view the Link State databases, use the show isis database command.
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 1088 0/0/0
eljefe.00-00 * 0x00000009 0xF76A 1126 0/0/0
eljefe.01-00 * 0x00000001 0x68DF 1122 0/0/0
eljefe.02-00 * 0x00000001 0x2E7F 1113 0/0/0
Force10.00-00 0x00000002 0xD1A7 1102 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 1124 0/0/0
eljefe.00-00 * 0x0000000D 0x51C6 1129 0/0/0
eljefe.01-00 * 0x00000001 0x68DF 1122 0/0/0
eljefe.02-00 * 0x00000001 0x2E7F 1113 0/0/0
Force10.00-00 0x00000004 0xCDA9 1107 0/0/0
Dell#
Controlling Routing Updates
To control the source of IS-IS route information, use the following command.
● Disable a specific interface from sending or receiving IS-IS routing information.
ROUTER ISIS mode
passive-interface interface
○ For a 1-Gigabit Ethernet interface, enter the keyword GigabitEthernet then the slot/port information.
○ For the Loopback interface on the RPM, enter the keyword loopback then a number from 0 to 16383.
○ For a port channel, enter the keywords port-channel then a number.
○ For a SONET interface, enter the keyword sonet then the slot/port information.
○ For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/ port information.
○ For a VLAN, enter the keyword vlan then a number from 1 to 4094.
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Intermediate System to Intermediate System