37-18
Catalyst 3560 Switch Software Configuration Guide
OL-8553-06
Chapter 37 Configuring IPv6 Unicast Routing
Configuring IPv6
Beginning in privileged EXEC mode, follow these steps to change the ICMP rate-limiting parameters:
To return to the default configuration, use the no ipv6 icmp error-interval global configuration
command.
This example shows how to configure an IPv6 ICMP error message interval of 50 milliseconds and a
bucket size of 20 tokens.
Switch(config)#ipv6 icmp error-interval 50 20
Configuring CEF for IPv6
Cisco Express Forwarding (CEF) is a Layer 3 IP switching technology to improve network performance.
IPv6 CEF is disabled by default but are automatically enabled when you configure IPv6 routing.
To route IPv6 unicast packets, you must first globally configure IPv6 unicast packet forwarding by using
the ipv6 unicast-routing global configuration command. You must configure an IPv6 address and IPv6
processing on an interface by using the ipv6 address interface configuration command.
To disable IPv6 CEF, use the no ipv6 cef global configuration command. To reenable IPv6 CEF or dCEF
if it has been disabled, use the ipv6 cef global configuration command. You can verify the IPv6 state by
entering the show ipv6 cef privileged EXEC command.
For more information about configuring CEF and dCEF, see the “Implementing IPv6 Addressing and
Basic Connectivity” chapter in the Cisco IOS IPv6 Configuration Library on Cisco.com.
Configuring Static Routes for IPv6
Before configuring a static IPv6 route, you must enable routing by using the ip routing global
configuration command, enable the forwarding of IPv6 packets by using the ipv6 unicast-routing global
configuration command, and enable IPv6 on at least one Layer 3 interface by configuring an IPv6
address on the interface.
Command Purpose
Step 1 configure terminal Enter global configuration mode.
Step 2 ipv6 icmp error-interval interval [bucketsize]Configure the interval and bucket size for IPv6 ICMP error
messages:
interval—The interval (in milliseconds) between tokens
being added to the bucket. The range is from 0 to
2147483647 milliseconds.
bucketsize—(Optional) The maximum number of tokens
stored in the bucket. The range is from 1 to 200.
Step 3 end Return to privileged EXEC mode.
Step 4 show ipv6 interface [interface-id] Verify your entries.
Step 5 copy running-config startup-config (Optional) Save your entries in the configuration file.