Dhcp Relay Agent For Ipv6; Configuring Dhcp For Ipv6 Relay Agent; Displaying Ecmp Load-Sharing Information For Ipv6 - Dell PowerConnect B-RX Configuration Manual

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DHCP relay agent for IPv6

DHCP relay agent for IPv6
A client locates a DHCP server using a reserve, link-scoped multicast address. For this reason, it is
a requirement for direct communication between the client and the server that they be attached by
the same link. However, in some situations in which ease of management, economy, and scalability
is a concern, it is useful to allow a DHCP client to send a message to a DHCP server by using a
DHCP relay agent. A DHCP relay agent, which may reside on the clients link, is used to relay
messages between the client and the server. A DHCP relay agent is transparent to the client.
When the relay agent receives a message to be relayed from a client to another relay agent, it
creates a new Relay-forward message, puts the original DHCP message to relay forward option, and
includes its only address and the address it received is in the same option.

Configuring DHCP for IPv6 relay agent

You can enable the DHCP for IPv6 relay agent function and specify the relay destination addresses
on an interface by entering the command at the interface level.
BigIron(config)# interface ethernet 2/3
BigIron(config-if-e10000-2/3)#ipv6 dhcp-relay-dest 2001::2
Syntax: ipv6 dhcp-relay-dest < ipv6-address >
Select the ipv6-address to specify a destination address to which the client messages are
forwarded and enables DHCP for IPv6 relay services on the interface.
Enabling support for network-based ECMP load sharing for IPv6
Network-based ECMP load sharing is supported. If this configuration is selected, traffic is
distributed across equal-cost paths based on the destination network address. Routes to each
network are stored in CAM and accessed when a path to a network is required. Because multiple
hosts are likely to reside on a network, this method uses fewer CAM entries than load sharing by
host. When you select network-based ECMP load sharing, you can choose either of the following
two CAM modes:
•
•

Displaying ECMP load-sharing information for IPv6

To display the status of ECMP load sharing for IPv6, enter the following command.
BigIron RX# show ipv6
Global Settings
unicast-routing enabled, hop-limit 64
No Inbound Access List Set
No Outbound Access List Set
Prefix-based IPv6 Load-sharing is Enabled, Number of load share paths: 4
1082
Dynamic Mode – In the dynamic mode, routes are entered into the CAM dynamically using a
flow-based scheme. In this mode routes are only added to the CAM as they are required. Once
routes are added to the CAM, they are subject to being aged-out when they are not in use.
Because this mode conserves CAM, it is useful for situations where CAM resources are
stressed or limited.
Static Mode – In the static mode, routes are entered into the CAM whenever they are
discovered. Routes are not aged once routes are added to the CAM and they are subject to
being aged-out when they are not in use.
BigIron RX Series Configuration Guide
53-1001810-01