Monitoring and Maintaining IS-IS
You can display specific IS-IS statistics, such as the contents of routing tables, caches, and databases. You
can also display information about specific interfaces, filters, or neighbors.
The following table lists the privileged EXEC commands for clearing and displaying IS-IS routing. For
explanations of the display fields, see the use the Cisco IOS command reference master index, or search online.
Table 17: IS-IS Show Commands
PurposeCommand
Displays the current state of
the ISIS IP routing table.
show ip route isis
Displays the IS-IS link-state
database.
show isis database
Displays the IS-IS Level 1
routing table.
show isis routes
Displays a history of the
shortest path first (SPF)
calculations for IS-IS.
show isis spf-log
Displays a list of all
connected routers in all areas.
show isis topology
Displays all route maps
configured or only the one
specified.
show route-map
Discover the paths taken to a
specified destination by
packets in the network.
trace clns destination
Information About Multi-VRF CE
Virtual Private Networks (VPNs) provide a secure way for customers to share bandwidth over an ISP backbone
network. A VPN is a collection of sites sharing a common routing table. A customer site is connected to the
service-provider network by one or more interfaces, and the service provider associates each interface with
a VPN routing table, called a VPN routing/forwarding (VRF) table.
Routing Configuration Guide, Cisco IOS XE Everest 16.6.x (Catalyst 9500 Switches)
158
Configuring IP Unicast Routing
Monitoring and Maintaining IS-IS
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