Enabling IPv6 ICMP redirect messages
You can enable a Layer 3 switch to send an IPv6 ICMP redirect message to a neighboring host to inform it of a better rst-hop router on
a path to a destination. By default, the sending of IPv6 ICMP redirect messages by a Layer 3 switch is disabled. (For more information
about how ICMP redirect messages are implemented for IPv6, refer to IPv6 neighbor discovery conguration on page 169.)
NOTE
This feature is supported on Virtual Ethernet (VE) interfaces only.
For example, to enable the sending of IPv6 ICMP redirect messages on VE 2, enter the following commands.
device(config)#interface ve2
device(config-vif-2)#ipv6 redirects
To disable the sending of IPv6 ICMP redirect messages after it has been enabled on VE 2, enter the following commands.
device(config)#interface ve2
device(config-vif-2)#no ipv6 redirects
Syntax: [no] ipv6 redirects
Use the show ipv6 interface command to verify that the sending of IPv6 ICMP redirect messages is enabled on a particular interface.
IPv6 neighbor discovery
conguration
The neighbor discovery feature for IPv6 uses IPv6 ICMP messages to do the following tasks:
• Determine the link-layer address of a neighbor on the same link.
• Verify that a neighbor is reachable.
• Track neighbor routers.
An IPv6 host is required to listen for and recognize the following addresses that identify itself:
• Link-local address.
• Assigned unicast address.
• Loopback address.
• All-nodes multicast address.
• Solicited-node multicast address.
• Multicast address to all other groups to which it belongs.
You can adjust the following IPv6 neighbor discovery features:
• Neighbor solicitation messages for duplicate address detection.
• Router advertisement messages:
– Interval between router advertisement messages.
– Value that indicates a router is advertised as a default router (for use by all nodes on a given link).
– Prexes advertised in router advertisement messages.
– Flags for host stateful autoconguration.
• Amount of time during which an IPv6 node considers a remote node reachable (for use by all nodes on a given link).
IPv6 neighbor discovery conguration
FastIron Ethernet Switch Layer 3 Routing
53-1003627-04 169
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