Configuring Router Advertisement Messages - Cisco 7604 Configuration Manual

Configuring IPv6 Neighbor Discovery
Valid values for the value argument range from 0 to 3600000 milliseconds. The default is 0.
This information is also sent in router advertisement messages.

Configuring Router Advertisement Messages

Router advertisement messages (ICMPv6 Type 134) are periodically sent out each IPv6 configured
interface of FWSM. The router advertisement messages are sent to the all-nodes multicast address.
Figure 10-2
Router advertisement messages typically include the following information:
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Router advertisements are also sent in response to router solicitation messages (ICMPv6 Type 133).
Router solicitation messages are sent by hosts at system startup so that the host can immediately
autoconfigure without needing to wait for the next scheduled router advertisement message. Because
router solicitation messages are usually sent by hosts at system startup, and the host does not have a
configured unicast address, the source address in router solicitation messages is usually the unspecified
IPv6 address (0:0:0:0:0:0:0:0). If the host has a configured unicast address, the unicast address of the
interface sending the router solicitation message is used as the source address in the message. The
destination address in router solicitation messages is the all-routers multicast address with a scope of the
link. When a router advertisement is sent in response to a router solicitation, the destination address in
the router advertisement message is the unicast address of the source of the router solicitation message.
You can configure the following settings for router advertisement messages:
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Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM
10-8
IPv6 Neighbor Discovery—Router Advertisement Message
Router
advertisement
Router advertisement packet definitions:
ICMPv6 Type = 134
Src = router link-local address
Dst = all-nodes multicast address
Data = options, prefix, lifetime, autoconfig flag
One or more IPv6 prefix that nodes on the local link can use to automatically configure their IPv6
addresses.
Lifetime information for each prefix included in the advertisement.
Sets of flags that indicate the type of autoconfiguration (stateless or stateful) that can be completed.
Default router information (whether the router sending the advertisement should be used as a default
router and, if so, the amount of time (in seconds) the router should be used as a default router).
Additional information for hosts, such as the hop limit and MTU a host should use in packets that it
originates.
The amount of time between neighbor solicitation message retransmissions on a given link.
The amount of time a node considers a neighbor reachable.
The time interval between periodic router advertisement messages.
Chapter 10
Router
advertisement
Configuring IPv6
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