Create Out of Band Management VRF on IOS XR

To create the out of band management vrf "OOB"

1. Go into configure mode and create the vrf.
vrf OOB_Mgmt
description Out Of Band Management
address-family ipv4 unicast
commit

2. Now add an interface into the vrf
interface MgmtEth0/RSP0/CPU0/0
vrf OOB_Mgmt
commit

3. Now add an ip address to the interface
interface MgmtEth0/RSP0/CPU0/0
ipv4 address 10.10.10.166/24
commit

4. Now add a default route for the vrf.
router static
vrf OOB_Mgmt
address-family ipv4 unicast
0.0.0.0/0 10.10.10.1
commit

5. Confirm by ping.
RP/0/RSP0/CPU0:XR1#ping vrf OOB_Mgmt 10.10.10.1 Thu Mar 26 10:58:33.571 CDT Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.10.10.1, timeout is 2 seconds: !!!!!

6. You can also check the routing table of the vrf by.
RP/0/RSP0/CPU0:XR1#show route vrf OOB_Mgmt
And there you go a OOB vrf. Enjoy