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Chapter 43 Configuring IPv6 Unicast Routing Understanding IPv6
For more information about static routes, see the “Implementing Static Routes for IPv6” chapter in the
Cisco IOS IPv6 Configuration Library on Cisco.com.
RIP for IPv6
Routing Information Protocol (RIP) for IPv6 is a distance-vector protocol that uses hop count as a
routing metric. It includes support for IPv6 addresses and prefixes and the all-RIP-routers multicast
group address FF02::9 as the destination address for RIP update messages.
For more information about RIP for IPv6, see the “Implementing RIP for IPv6” chapter in the Cisco IOS
IPv6 Configuration Library on Cisco.com.
OSPF for IPv6
The switch running the IP-services feature set supports Open Shortest Path First (OSPF) for IPv6, a
link-state protocol for IP. For more information, see the “Implementing OSFP for IPv6” chapter in the
Cisco IOS IPv6 Configuration Library on Cisco.com.
EIGRP IPv6
The switch running the IP-services feature set supports Enhanced Interior Gateway Routing Protocol
(EIGRP) for IPv6. It is configured on the interfaces on which it runs and does not require a global IPv6
address.
Before running, an instance of EIGRP IPv6 requires an implicit or explicit router ID. An implicit router
ID is derived from a local IPv4 address, so any IPv4 node always has an available router ID. However,
EIGRP IPv6 might be running in a network with only IPv6 nodes and therefore might not have an
available IPv4 router ID.
For more information about EIGRP for IPv6, see the “Implementing EIGRP for IPv6” chapter in the
Cisco IOS IPv6 Configuration Library on Cisco.com.
HSRP for IPv6
The switch running the IP-services feature set supports the Hot Standby Router Protocol (HSRP) for
IPv6. HSRP provides routing redundancy for routing IPv6 traffic not dependent on the availability of
any single router. IPv6 hosts learn of available routers through IPv6 neighbor discovery router
advertisement messages. These messages are multicast periodically or are solicited by hosts.
An HSRP IPv6 group has a virtual MAC address that is derived from the HSRP group number and a
virtual IPv6 link-local address that is, by default, derived from the HSRP virtual MAC address. Periodic
messages are sent for the HSRP virtual IPv6 link-local address when the HSRP group is active. These
messages stop after a final one is sent when the group leaves the active state.
For more information about configuring HSRP for IPv6, see the “Configuring First Hop Redundancy
Protocols in IPv6” chapter in the Cisco IOS IPv6 Configuration Library on Cisco.com.
SNMP and Syslog Over IPv6
To support both IPv4 and IPv6, IPv6 network management requires both IPv6 and IPv4 transports.
Syslog over IPv6 supports address data types for these transports.