Refer to the partial Cisco IOS XR configurations exhibits for Router 1 and Router 2.
RP/0/RP0/CPU0:Router1#show running-config mpls ldp
mpls ldp
router-id 33.33.33.33
log
adjacency
!
interface GigabitEthernet0/2/0/6
!
RP/0/RP1/CPU0:Router2#show running-config mpls ldp
mpls ldp
router-id 10.12.0.3
log
neighbor
!
interface GigabitEthernet0/0/2/2
!
RP/0/RP0/CPU0:Router1#show running-config router ospf
router ospf test
area 0
interface Loopback7
passive enable
!
RP/0/RP1/CPU0:Router2#show running-config router ospf
router ospf test
area 0
interface Loopback0
passive enable
!
interface GigabitEthernet0/0/2/2
!
There are two routers that are connected back to back over the Gigabit Ethernet link. If the "show mpls ldp neighbor" command output on Router 1 does not show LDP peering with Router 2, what could be the possible root cause of the LDP peering problem?