Reference Guide

● mask: The prefix length is from 0 to 128.
The IPv6 address must be on the same subnet as other IS-IS neighbors, but the IP address does not need to relate to the
NET address.
6. Enable IS-IS on the IPv4 interface.
ROUTER ISIS mode
ip router isis [tag]
If you configure a tag variable, it must be the same as the tag variable assigned in step 1.
7. Enable IS-IS on the IPv6 interface.
ROUTER ISIS mode
ipv6 router isis [tag]
If you configure a tag variable, it must be the same as the tag variable assigned in step 1.
The default IS type is level-1-2. To change the IS type to Level 1 only or Level 2 only, use the is-type command in ROUTER
ISIS mode.
To view the IS-IS configuration, enter the show isis protocol command in EXEC Privilege mode or the show config
command in ROUTER ISIS mode.
Dell#show isis protocol
IS-IS Router: <Null Tag>
System Id: EEEE.EEEE.EEEE IS-Type: level-1-2
Manual area address(es):
47.0004.004d.0001
Routing for area address(es):
21.2223.2425.2627.2829.3031.3233
47.0004.004d.0001
Interfaces supported by IS-IS:
Vlan 2
GigabitEthernet 4/22
Loopback 0
Redistributing:
Distance: 115
Generate narrow metrics: level-1-2
Accept narrow metrics: level-1-2
Generate wide metrics: none
Accept wide metrics: none
Dell#
To view IS-IS protocol statistics, use the show isis traffic command in EXEC Privilege mode.
Dell#show isis traffic
IS-IS: Level-1 Hellos (sent/rcvd) : 4272/1538
IS-IS: Level-2 Hellos (sent/rcvd) : 4272/1538
IS-IS: PTP Hellos (sent/rcvd) : 0/0
IS-IS: Level-1 LSPs sourced (new/refresh) : 0/0
IS-IS: Level-2 LSPs sourced (new/refresh) : 0/0
IS-IS: Level-1 LSPs flooded (sent/rcvd) : 32/19
IS-IS: Level-2 LSPs flooded (sent/rcvd) : 32/17
IS-IS: Level-1 LSPs CSNPs (sent/rcvd) : 1538/0
IS-IS: Level-2 LSPs CSNPs (sent/rcvd) : 1534/0
IS-IS: Level-1 LSPs PSNPs (sent/rcvd) : 0/0
IS-IS: Level-2 LSPs PSNPs (sent/rcvd) : 0/0
IS-IS: Level-1 DR Elections : 2
IS-IS: Level-2 DR Elections : 2
IS-IS: Level-1 SPF Calculations : 29
IS-IS: Level-2 SPF Calculations : 29
IS-IS: LSP checksum errors received : 0
IS-IS: LSP authentication failures : 0
Dell#
You can assign more NET addresses, but the System ID portion of the NET address must remain the same. The system supports
up to six area addresses.
Some address considerations are:
● In order to be neighbors, configure Level 1 routers with at least one common area address.
412
Intermediate System to Intermediate System