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Configuring IPv6 Unicast Routing
Prerequisites
HSRP for IPv6
Prerequisites
Select a dual IPv4 and IPv6 template as described in the
Guidelines and Limitations
Because IPv6 is implemented in switch hardware, some limitations occur due to the IPv6 compressed addresses in the
hardware memory. This results in some loss of functionality and some feature limitations.
When using user-network interface (UNI) or enhanced network interface (ENI) ports for any IPv6-related features,
you must first globally enable IP routing and IPv6 routing on the switch by entering the ip routing and ipv6
unicast-routing global configuration commands even if you are not using IPv6 routing.
ICMPv6 redirect functionality is not supported for IPv6 host routes (routes used to reach a specific host) or for IPv6
routes with masks greater than 64 bits. The switch cannot redirect hosts to a better first-hop router for a specific
destination that is reachable through a host route or through a route with masks greater than 64 bits.
Load balancing using equal cost and unequal cost routes is not supported for IPv6 host routes or for IPv6 routes with
a mask greater than 64 bits.
The switch cannot forward SNAP-encapsulated IPv6 packets.
There is a similar limitation for IPv4 SNAP-encapsulated packets, but the packets are dropped at the switch.
The switch routes IPv6-to-IPv4 and IPv4-to-IPv6 packets in hardware, but the switch cannot be an IPv6-to-IPv4 or
IPv4-to-IPv6 tunnel endpoint.
Bridged IPv6 packets with hop-by-hop extension headers are forwarded in software. In IPv4, these packets are
routed in software but bridged in hardware.
In addition to the normal SPAN and RSPAN limitations defined in the software configuration guide, these limitations
are specific to IPv6 packets:
—
When you send RSPAN IPv6-routed packets, the source MAC address in the SPAN output packet might be
incorrect.
—
When you send RSPAN IPv6-routed packets, the destination MAC address might be incorrect. Normal traffic is
not affected.
The switch cannot apply QoS classification or policy-based routing on source-routed IPv6 packets in hardware.
The switch cannot generate ICMPv6
Dual IPv4 and IPv6 Protocol Stacks, page
messages for multicast packets.
Packet Too Big
933
930.
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