IP Link-State Routing Protocols - CCIE Routing and Switching Exam Certification Guide - page 407

For Router 9, the show clns is-neighbors command shows the adjacent ISs, the IS type,
priority, and state, as displayed in Example 8-25.
Example 8-25 IS Neighbor Display on Router 9
Router9>show clns is-neighbors
System Id Interface State Type Priority Circuit Id Format
Router10 Se0 Up L1L2 0 /0 00 Phase V
Router8 Et0 Up L2 64 Router8.01 Phase V
Router 9 is adjacent to two ISs, Router 10 and Router 8. Both L1 and L2 adjacencies have been
formed on the link between Router 9 and Router 10. The link between Router 9 and Router 8
is L2 only. The Router 9 priority on the Ethernet interface is 64. The Circuit ID is a single-byte
numerical identifier that uniquely identifies the IS-IS interface. The Circuit Id associated with
Router 8 is Router8.01. This is the pseudonode identifier, which consists of the DIS system
name concatenated with the Circuit Id.
For Router 9, the show ip route command shows all L1 and L2 routes for the network. The
show ip protocols command displays the protocol configuration on Router 9. Example 8-26
displays the results of the commands show ip route , show ip protocols , show isis topology ,
and show isis database on Router 9.
Example 8-26 Router 9 Routing Table, Protocol Configuration, Topology, and Database
Router9#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 not set
S 10.0.0.0/8 is directly connected, Null0
192.16.100.0/24 is variably subnetted, 6 subnets, 3 masks
C 192.16.100.240/30 is directly connected, Serial0
i L1 192.16.100.32/28 [115/50] via 192.16.100.242, Serial0
C 192.16.100.16/28 is directly connected, Ethernet0
i L2 192.16.100.1/32 [115/15] via 192.16.100.20, Ethernet0
C 192.16.100.2/32 is directly connected, Loopback0
i L1 192.16.100.3/32 [115/50] via 192.16.100.242, Serial0
Router9#show ip protocols
Routing Protocol is "isis cisco"
Invalid after 0 seconds, hold down 0, flushed after 0
continues