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Configuring DHCP Relay with a Bridge Domain VLAN

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 snooping


group 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

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