37-6
Catalyst 3560 Switch Software Configuration Guide
OL-8553-06
Chapter 37 Configuring IPv6 Unicast Routing
Understanding IPv6
The dual IPv4 and IPv6 templates allow the switch to be used in dual stack environments.
• If you try to configure IPv6 without first selecting a dual IPv4 and IPv6 template, a warning message
appears.
• In IPv4-only environments, the switch routes IPv4 packets and applies IPv4 QoS and ACLs in
hardware. IPv6 packets are not supported.
• In dual IPv4 and IPv6 environments, the switch routes both IPv4 and IPv6 packets and applies IPv4
QoS in hardware.
• IPv6 QoS is not supported.
• If you do not plan to use IPv6, do not use the dual stack template because this template results in
less TCAM capacity for each resource.
For more information about IPv4 and IPv6 protocol stacks, see the “Implementing IPv6 Addressing and
Basic Connectivity” chapter of Cisco IOS IPv6 Configuration Library on Cisco.com.
DHCP for IPv6 Address Assignment
DHCPv6 enables DHCP servers to pass configuration parameters, such as IPv6 network addresses, to
IPv6 clients. The address assignment feature manages nonduplicate address assignment in the correct
prefix based on the network where the host is connected. Assigned addresses can be from one or multiple
prefix pools. Additional options, such as default domain and DNS name-server address, can be passed
back to the client. Address pools can be assigned for use on a specific interface, on multiple interfaces,
or the server can automatically find the appropriate pool.
This document describes only the DHCPv6 address assignment. For more information about configuring
the DHCPv6 client, server, or relay agent functions, see the “Implementing DHCP for IPv6” chapter in
the Cisco IOS IPv6 Configuration Library on Cisco.com.
Static Routes for IPv6
Static routes are manually configured and define an explicit route between two networking devices.
Static routes are useful for smaller networks with only one path to an outside network or to provide
security for certain types of traffic in a larger network.
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 image 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.