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Cisco ME 3800X and 3600X Switch Software Configuration Guide
OL-23400-01
Chapter 29 Configuring IP Unicast Routing
Enabling IPv4 Unicast Routing
Monitoring and Maintaining IP Addressing
When the contents of a particular cache, table, or database have become or are suspected to be invalid,
you can remove all its contents by using the clear privileged EXEC commands.
You can display specific statistics, such as the contents of IP routing tables, caches, and databases; the
reachability of nodes; and the routing path that packets are taking through the network.
Enabling IPv4 Unicast Routing
By default, the switch is in Layer 2 switching mode and IP routing is disabled. To use the Layer 3
capabilities of the switch, you must enable IP routing.
Beginning in privileged EXEC mode, follow these steps to enable IP routing:
Table 29-2
Commands to Clear Caches, Tables, and Databases
Command
Purpose
clear arp-cache
Clear the IP ARP cache and the fast-switching cache.
clear host {name | *}
Remove one or all entries from the hostname and the address cache.
clear ip route {network [mask] |*}
Remove one or more routes from the IP routing table.
Table 29-3
Commands to Display Caches, Tables, and Databases
Command
Purpose
show arp
Display the entries in the ARP table.
show hosts
Display the default domain name, style of lookup service, name server hosts,
and the cached list of hostnames and addresses.
show ip aliases
Display IP addresses mapped to TCP ports (aliases).
show ip arp
Display the IP ARP cache.
show ip interface [interface-id]
Display the IP status of interfaces.
show ip irdp
Display IRDP values.
show ip masks address
Display the masks used for network addresses and the number of subnets
using each mask.
show ip redirects
Display the address of a default gateway.
show ip route [address [mask]] | [protocol]
Display the current state of the routing table.
show ip route summary
Display the current state of the routing table in summary form.
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
ip routing
Enable IP routing.
