Cisco 300 Series Cli Manual page 346

Stackable managed switches

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DHCPv6 Commands

OL-32830-01 Command Line Interface Reference Guide

DHCPv6 Relay inserts the Interface-id option if an IPv6 global address is not

defined on the interface on which the relay is running. The Interface-id field of the

option is the interface name (a value of the ifName field of the ifTable) on which the

relay is running.

When relay service is running on an interface, a DHCP for IPv6 message received

on that interface will be forwarded to all configured relay destinations configured

per interface and globally.

The incoming DHCP for IPv6 message may have come from a client on that

interface, or it may have been relayed by another relay agent.

The relay destination can be a Unicast address of a server or another relay agent,

or it may be a Multicast address. There are two types of relay destination

• A link-local Unicast or Multicast IPv6 address, for which a user must specify an

output interface.

• A global Unicast IPv6 address. A user can optionally specify an output

interface for this kind of address.

If no output interface is configured for a destination, the output interface is

determined by routing tables. In this case, it is recommended that a Unicast or

Multicast routing protocol be running on the router.

Multiple destinations can be configured on one interface, and multiple output

interfaces can be configured for one destination. When the relay agent relays

messages to a Multicast address, it sets the hop limit field in the IPv6 packet

header to 32.

Unspecified, loopback, and node-local Multicast addresses are not acceptable as

the relay destination.

Note that it is not necessary to enable the relay function on an interface for it to

accept and forward an incoming relay reply message from servers. By default, the

relay function is disabled, and there is no relay destination on an interface.

Use the no form of the command with arguments to remove a specific address.

Use the no form of the command without arguments to remove all the defined

addresses and to disable the relay on the interface.

Example 1. The following example sets the relay Unicast link-local destination

address per VLAN 200 and enables the DHCPv6 Relay on VLAN 100 if it was not