Concept Guide

DHCP Relay When DHCP Server and Client are in
Dierent VRFs
When the DHCP server and DHCP clients belong to dierent VRFs on the relay agent, you can congure the system to leak routes across
VRFs.
You can congure the system to leak the following routes across VRFs:
• Connected routes
• The complete routing table
• Selective routes
The following illustration depicts the topology in which routes are leaked between VRFs in the relay agent.
VRF_1 VRF_2
DHCP Server --------------------- DHCP relay agent --------------------------- Client
(10.0.0.1) (10.0.0.2) (20.0.0.2) (20.0.0.4)
Conguring Route Leaking between VRFs on DHCP Relay
Agent
To congure route leaking between VRFs on DHCP relay agent, include the conguration similar to the following along with your DHCP
relay conguration on your system.
Route Leaking for Connected Routes
!
ip vrf VRF_1
ip route-import 1:1 rmap1
ip route-export 2:2 rmap2
!
ip vrf VRF_2
ip route-import 2:2
ip route-export 1:1
!
route-map rmap1 permit 10
match source-protocol connected
!
route-map map2 permit 20
match source-protocol connected
Route Leaking for Complete Routing Table
!
ip vrf VRF_1
ip route-import 1:1
ip route-export 2:2
!
ip vrf VRF_2
ip route-import 2:2
ip route-export 1:1
Route Leaking for Selective Routes
!
ip vrf VRF_1
Dynamic Host
Conguration Protocol (DHCP) 309