36-12
Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
Chapter 36 Configuring IPv6 Unicast Routing
Configuring IPv6
Beginning in privileged EXEC mode, follow these steps to assign an IPv6 address to a Layer 3 interface
and enable IPv6 routing:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
sdm prefer dual-ipv4-and-ipv6 {default |
routing | vlan} [desktop]
Select an SDM template that supports IPv4 and IPv6.
• default—Set the switch to the default template to balance
system resources.
• routing—Set the switch to the routing template to support
IPv4 and IPv6 routing, including IPv4 policy-based routing.
• vlan—Maximize VLAN configuration on the switch with
no routing supported in hardware.
• desktop—Supported only on Catalyst 3750-12S aggregator
switches to set the switch to one of the desktop templates. If
not selected on an aggregator switch, an aggregator template
is automatically selected.
Step 3
end Return to privileged EXEC mode.
Step 4
reload Reload the operating system.
Step 5
configure terminal Enter global configuration mode (after the switch has reloaded).
Step 6
interface interface-id Enter interface configuration mode, and specify the Layer 3
interface to configure. The interface can be a physical interface,
a switch virtual interface (SVI), or a Layer 3 EtherChannel.
Step 7
no switchport Remove the interface from Layer 2 configuration mode (if it is a
physical interface).
Step 8
ipv6 address ipv6-prefix/prefix length eui-64
or
ipv6 address ipv6-address link-local
or
ipv6 enable
Specify a global IPv6 address with an extended universal
identifier (EUI) in the low-order 64 bits of the IPv6 address.
Specify only the network prefix; the last 64 bits are
automatically computed from the switch MAC address. This
enables IPv6 processing on the interface.
Specify a link-local address on the interface to be used instead
of the link-local address that is automatically configured when
IPv6 is enabled on the interface. This command enables IPv6
processing on the interface.
Automatically configure an IPv6 link-local address on the
interface, and enable the interface for IPv6 processing. The
link-local address can only be used to communicate with nodes
on the same link.
Step 9
exit Return to global configuration mode.
Step 10
ip routing Enable IP routing on the switch.
Step 11
ipv6 unicast-routing Enable forwarding of IPv6 unicast data packets.
Step 12
end Return to privileged EXEC mode.
Step 13
show ip v6 interface interface-id Verify your entries.
Step 14
copy running-config startup-config (Optional) Save your entries in the configuration file.
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