Technical Documentation
Related Documentation
- MX Series
- MX Series Router as a Layer 2 DHCP Relay Agent
- Example: Configuring DHCP Relay in a Bridge Domain VLAN Environment
- Additional Information
- DHCP Relay Agent
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 to 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 bd12 clients, (2 bound, 0 selecting, 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 detail2 clients, (2 bound, 0 selecting, 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
Related Documentation
- MX Series
- MX Series Router as a Layer 2 DHCP Relay Agent
- Example: Configuring DHCP Relay in a Bridge Domain VLAN Environment
- Additional Information
- DHCP Relay Agent
Published: 2011-11-01
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