For several years I’ve been using VRFs for all management functions.  This greatly improves security since all management functions can be locked down to a certain interface, and also recover-ability in the even of routing problems.  The downside I keep finding is certain things either don’t work, or require special work-rounds. Case in point: DNS resolution.

Per Cisco, VRF-aware DNS functionality has been supported for quite a while.  However, I’m completely stumped on how to actually use it.  Sample config on an 2921 router running IOS 15.5(3)M4:

ip vrf Mgmt-intf
 rd 12345:123
!
ip domain-lookup 
ip domain list vrf Mgmt-intf mydomain.com
ip name-server vrf Mgmt-intf 10.20.30.40

!
interface Port-channel1.123
 encapsulation dot1Q 123
 ip vrf forwarding Mgmt-intf
 ip address 10.20.30.100 255.255.255.0
!
ip domain-lookup vrf Mgmt-intf source-interface po1.123

Still no joy.  Really seems there was a goof here in enabling this feature.  I’ll complain to Cisco and hopefully it will be fixed by the time I die.