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Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 32 Configuring Layer 3 Interfaces
Configuring VLANs as Layer 3 Interfaces
The following example shows how to configure IPv6 MTU on an interface:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface vlan 1
Switch(config-if)# ipv6 mtu 1280
Switch(config)# end
This example shows how to verify the configuration
Switch# show ipv6 interface vlan 1
Vlan1 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::214:6AFF:FEBC:DEEA
Global unicast address(es):
1001::1, subnet is 1001::/64
Joined group address(es):
FF02::1
FF02::1:FF00:1
FF02::1:FFBC:DEEA
MTU is 1280 bytes
...................(continued)
Note When IPv6 is enabled on an interface using any CLI command, you may see the following message:
% Hardware MTU table exhausted
In this situation, the IPv6 MTU value programmed in hardware differs from the IPv6 interface MTU
value. This situation occurs if no room exists in the hardware MTU table to store additional values. You
must free up some space in the table by unconfiguring some unused MTU values and subsequently
disable and reenable IPv6 on the interface or reapply the MTU configuration.
Configuring Layer 3 Interface Counters
Note Catalyst 4900M, Catalyst 4948E, Supervisor Engine 6-E, Supervisor Engine 6L-E, Supervisor Engine
7-E, and Supervisor Engine 7L-E, do not support Layer 2 interface counters.
To configure Layer 3 interface counters (assign counters to a Layer 3 interface), perform this task:
Command Purpose
Step 1
Switch# configure terminal
Enters global configuration mode.
Step 2
Switch(config)# interface interface-id
Enters interface configuration mode.
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