Exploring the quirks of Network Engineering
Scenario
Extremely simple setup showing a WAN interface in a VRF configured with DHCP Relay.
IOS Config
interface Gi0/0.100
description WAN link to customer
encapsulation dot1q 100
ip vrf forwarding CUSTOMER_1
ip address 192.168.1.1 255.255.255.252
ip helper-address 10.1.1.1
!
XR Config
interface GigabitEthernet0/0/0/0.100
description WAN link to customer
vrf CUSTOMER_1
ipv4 address 192.168.1.1/30
encapsulation dot1q 100
!
dhcp ipv4
!
profile CUST1_RELAY relay
helper-address vrf default 10.1.1.1
!
interface GigabitEthernet0/0/0/0.100 relay profile CUST1_RELAY
!