Information Technology Reference
In-Depth Information
IS-IS
show
Commands
After all ISs are configured, several
show
commands can verify connectivity when using IS-IS.
These commands are as follows:
•
show isis database
•
show isis topology
•
show clns is-neighbors
•
show ip route
•
show ip protocols
All the configurations in this section refer to Figure 8-10.
The output of these commands is displayed throughout this section. IS-IS routes are marked
with an i. L1 and L2 mark L1 and L2 routes. IS-IS routes use 115 as an administrative distance
in Cisco routers. Example 8-22 displays the routing table on Router 8.
Example 8-22
Router 8 Routing Table
Router8#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 192.16.100.18 to network 0.0.0.0
172.16.0.0/28 is subnetted, 1 subnets
C 172.16.3.0 is directly connected, TokenRing0
i L2 10.0.0.0/8 [115/134] via 192.16.100.18, Ethernet0
192.16.100.0/24 is variably subnetted, 6 subnets, 3 masks
i L2 192.16.100.240/30 [115/20] via 192.16.100.18, Ethernet0
i L2 192.16.100.32/28 [115/60] via 192.16.100.18, Ethernet0
C 192.16.100.16/28 is directly connected, Ethernet0
C 192.16.100.1/32 is directly connected, Loopback0
i L2 192.16.100.2/32 [115/15] via 192.16.100.18, Ethernet0
i L2 192.16.100.3/32 [115/60] via 192.16.100.18, Ethernet0
i*L2 0.0.0.0/0 [115/10] via 192.16.100.18, Ethernet0
Router 8's only connection to another IS is through an L2-only circuit, so only L2 routes are in
the table. The redistributed route, 10.0.0.0, is shown as a L2 route, and the default route that was
originated on Router 9 is also shown.
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