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39-9
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter 39 Configuring IPv6 Unicast Routing
Understanding IPv6
SDM Templates
To allocate system resources for unicast routes, MAC addresses, ACLs and other features, the switch
SDM templates prioritize system resources to optimize support for certain features. You select the
template that best suits the switch environment by entering the sdm prefer global configuration
command. For more information about SDM templates, see Chapter 8, “Configuring SDM Templates.”
You can select SDM templates to support IP Version 6 (IPv6). The dual IPv4 and IPv6 templates allow
the switch to be used in dual stack environments (supporting both IPv4 and IPv6).
Note If you try to configure IPv6 without first selecting a dual IPv4 and IPv6 template, a warning message is
generated.
• 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
security and QoS ACLs. The switch also routes IPv6 security ACLs in hardware.
Note Using the dual stack templates results in less hardware memory capacity allowed for each resource, so
do not use if you plan to forward only IPv4 traffic.
Dual IPv4-and IPv6 SDM Templates
These SDM templates support IPv4 and IPv6 environments:
Note This release does not support IPv6 multicast routing or QoS. This release does support IPv6 Multicast
Listener Discovery (MLD) snooping.
• On Catalyst 3750-E switches
–
Dual IPv4 and IPv6 default template—supports Layer 2, multicast, routing, QoS, and ACLs for
IPv4; and Layer 2, routing, and ACLs for IPv6 on the switch.
–
Dual IPv4 and IPv6 routing template—supports Layer 2, multicast, routing (including
policy-based routing), QoS, and ACLs for IPv4; and Layer 2, routing, and ACLs for IPv6 on
the switch.
–
Dual IPv4 and IPv6 VLAN template—supports basic Layer 2, multicast, QoS, and ACLs for
IPv4, and basic Layer 2 and ACLs for IPv6 on the switch.
• On Catalyst 3560-E switches
–
Dual IPv4 and IPv6 default template—supports Layer 2, multicast, routing, QoS, and ACLs for
IPv4; and Layer 2, routing, and ACLs for IPv6 on the switch.
–
Dual IPv4 and IPv6 routing template—supports Layer 2, multicast, routing (including
policy-based routing), QoS, and ACLs for IPv4; and Layer 2, routing, and ACLs for IPv6 on
the switch.
–
Dual IPv4 and IPv6 VLAN template—supports basic Layer 2, multicast, QoS, and ACLs for
IPv4, and basic Layer 2 and ACLs for IPv6 on the switch.