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Example: Configuring DHCP Relay in a VPLS Routing Instance Environment

The following example configures DHCP relay in a bridge domain (VLAN) environment. The MX Series router will trust only the MAC addresses learned on the listed interfaces.

Note: This is not a complete router configuration.

The router has three interfaces: two interfaces (ge-2/2/4 and ge-2/2/6) using VLAN 100 for the DHCP clients, and one (xe-9/2/0) leading ot the DHCP server. The router performs the DHCP snooping (relay) function.

Configure the Interfaces

[edit interfaces]ge-2/2/4 {encapsulation ethernet-bridge;unit 0 {family bridge {interface-mode access;vlan-id 100;}}}ge-2/2/6 {encapsulation ethernet-bridge;unit 0 {family bridge {interface-mode access;vlan-id 100;}}}xe-9/2/0 {unit 0 {family bridge {interface-mode access;vlan-id 100;}}}

Configure the Routing Instance (Virtual Switch)

[edit routing-instances]vs1 {instance-type virtual-switch;interface ge-2/2/4.0;interface ge-2/2/6.0;interface xe-9/2/0;bridge-domains {bd1 {domain-type bridge;vlan-id 100;forwarding-options {dhcp-relay { # DHCP snoopinggroup hdhcp {interface ge-2/2/4.0;interface ge-2/2/6.0;}}}}}}

You verify your configuration by using two related commands:

  • show dhcp relay binding routing-instance vs1 bridge-domains bd1
  • show dhcp relay binding routing-instance vs1 bridge-domains bd1 detail

user@router1> show dhcp relay binding routing-instance vs1 bridge-domains bd1
2 clients, (2 bound, 0 slecting, 0 renewing, 0 rebinding)
IP address     Hardware address    Type    Lease expires at
192.168.1.1   00:00:00:42:a8:e3  active   2008–12–12 15:56:04 PST
192.168.1.2   00:00:00:42:a8:e4  active   2008–12–12 15:56:10 PST

user@router1> show dhcp relay binding routing-instance vs1 bridge-domains bd1 detail
2 clients, (2 bound, 0 slecting, 0 renewing, 0 rebinding)
Clients bindings information:
 IP address          : 192.168.1.1
   Hardware address  : 00:00:00:42:a8:e3
   Type              : active
   Lease expires at  : 2008–12–12 15:56:04 PST
   State             : bound
   interface         : ge—2/2/6.0
 IP address          : 192.168.1.2
   Hardware address  : 00:00:00:42:a8:e4
   Type              : active
   Lease expires at  : 2008–12–12 15:56:10 PST
   State             : bound
   interface         : ge—2/2/4.0
  

Published: 2010-04-12

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