Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 460)

432 Multi-Service IronWare Routing Configuration Guide
53-1003033-02
DHCP relay agent for IPv6
Upgrade and downgrade considerations
• When a router is upgraded to the version of software that supports this feature, the saved
information about delegated prefixes will be examined and if the delegated prefix lifetime is
not expired, then the prefix will be added to the IPv6 static route table.
• When a router is downgraded to the version of software that does not support this feature, the
saved information about delegated prefixes is retained and it cannot be used. If the delegated
prefix lifetime is not expired, then the prefix will be added to the IPv6 static route table.
Configuring DHCP for IPv6 relay agent
You can enable the DHCP for IPv6 relay agent function and specify the relay destination address
(i.e. the DHCP server) on an interface by entering this command at the interface level.
Brocade(config)# interface ethernet 2/3
Brocade(config-if-e10000-2/3)#ipv6 dhcp-relay-destination 2001:DB8::2
Syntax: [no] ipv6 dhcp-relay-destination ipv6-address
Specify the ipv6-address as a destination address to which client messages are forwarded and
which enables DHCP for IPv6 relay service on the interface. A maximum of 16 relay destination
addresses may be entered.
Configuring DHCPv6 Relay Agent Prefix Delegation
Notification
To set the number of delegated prefixes that can be learned at the global system level, use the ipv6
dhcp-relay maximum-delegated-prefixes command.
By default, the DHCPv6 Relay Agent Prefix Delegation Notification is enabled when the DHCPv6
relay agent feature is enabled on an interface. User can disable the DHCPv6 Relay Agent Prefix
Delegation Notification at system or interface level by setting ipv6 dhcp-relay
maximum-delegated-prefixes to 0 at system level or interface level as required.
NOTE
There should be a minimum free space of 7 MB in the flash memory to save information about
delegated prefixes in flash on both the Active and Standby management processor
Brocade(config)# ipv6 dhcp-relay maximum-delegated-prefixes 5000
Syntax: [no] ipv6 dhcp-relay maximum-delegated-prefixes value
The value parameter is used to limit the maximum number of prefixes that can be learnt at the
global level. The range is from 0 to 100000. The default value varies for different platforms.
Use the no ipv6 dhcp-relay maximum-delegated-prefixes command to set the parameter to the
default value of the specified platform. See
Table 72 for more information.