ASR920 xconnect encapsulation mpls not coming up

[CiscoBuddy1]

Hello everyone.

xconnect encapsulation mpls not coming up between two ASR920. i am not sure if i am missing any configuration. kindly assist

ASR920-01

interface GigabitEthernet0/0/9

mtu 1518
no ip address
negotiation auto
no keepalive
service instance 1 ethernet
encapsulation default
l2protocol forward cdp stp vtp pagp dot1x lldp lacp udld loam esmc elmi ptppd R4 R5 R6 R8 R9 RA RB RC RD RF mmrp mvrp
xconnect 192.168.1.2 711 encapsulation mpls
!
end

int loopback0

ip address 192.168.1.1 255.255.255.255

mpls ldp neighbor 192.168.1.2  password xxxxx

Legend: XC ST=Xconnect State S1=Segment1 State S2=Segment2 State
UP=Up DN=Down AD=Admin Down IA=Inactive
SB=Standby HS=Hot Standby RV=Recovering NH=No Hardware

XC ST Segment 1 S1 Segment 2 S2
------+---------------------------------+--+---------------------------------+--
DN pri ac Gi0/0/9:1(Ethernet) UP mpls 192.168.1.2:711 DN

ASR920-02

interface GigabitEthernet0/0/2
mtu 1518
no ip address
negotiation auto
no keepalive
service instance 1 ethernet
encapsulation default
l2protocol forward cdp stp vtp pagp dot1x lldp lacp udld loam esmc elmi ptppd R4 R5 R6 R8 R9 RA RB RC RD RF mmrp mvrp
xconnect 192.168.1.1 711 encapsulation mpls
!
end

int loopback0

ip address 192.168.1.2 255.255.255.255

mpls ldp neighbor 192.168.1.1 password x xxxxx

Legend: XC ST=Xconnect State S1=Segment1 State S2=Segment2 State
UP=Up DN=Down AD=Admin Down IA=InactiveRouting
SB=Standby HS=Hot Standby RV=Recovering NH=No Hardware

XC ST Segment 1 S1 Segment 2 S2
------+---------------------------------+--+---------------------------------+--
DN pri ac Gi0/0/2:1(Ethernet) UP mpls 192.168.1.1:711 DN

[balaji.bandi]

How are these devices connected? do you have underlay reachability?

[Harold Ritter]

Hi @CiscoBuddy1 ,

The MPLS LSP between the ASR920-01 and ASR920-02 is down. This is why the xconnect is down.

A quick way to verify that is to perform a "ping mpls" from ASR920-01 as follow:

ping mpls ipv4 192.168.1.2/32 source 192.168.1.1

Please check that LDP is configured and up end to end.

[CiscoBuddy1]

Yes i can ping it and also LDP is up too.

ping mpls ipv4 192.168.1.2/32 source 192.168.1.1
Sending 5, 72-byte MPLS Echos to 192.168.1.2/32,
timeout is 2 seconds, send interval is 0 msec:

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
'L' - labeled output interface, 'B' - unlabeled output interface,
'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
'M' - malformed request, 'm' - unsupported tlvs, 'N' - no label entry,
'P' - no rx intf label prot, 'p' - premature termination of LSP,
'R' - transit router, 'I' - unknown upstream index,
'l' - Label switched with FEC change, 'd' - see DDMAP for return code,
'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/5 ms
Total Time Elapsed 31 ms

show mpls ldp neighbor 192.168.1.2
Peer LDP Ident: 192.168.1.2 :0; Local LDP Ident 192.168.1.1:0
TCP connection: 192.168.1.2.646 - 192.168.1.1.53061
State: Oper; Msgs sent/rcvd: 3515/3497; Downstream
Up time: 1d10h
LDP discovery sources:
Targeted Hello 192.168.1.1-> 192.168.1.2, active, passive
Addresses bound to peer LDP Ident:
xxxx,xxxx

[Harold Ritter]

HI @CiscoBuddy1 ,

Thanks for the extra information. Can you provide the output for the following command from ABR920-01:

show mpls l2transport vc 711 detail

[CiscoBuddy1]

show mpls l2transport vc 711 detail
Local interface: Gi0/0/9 up, line protocol up, Ethernet:1 up
Destination address: 192.168.1.2, VC ID: 711, VC status: down
Last error: Local peer access circuit is down
Output interface: Gi0/0/0, imposed label stack {24010 2399}
Preferred path: not configured
Default path: active
Next hop: 10.x.x.102
Create time: 1d11h, last status change time: 1d11h
Last label FSM state change time: 1d11h
Signaling protocol: LDP, peer 192.168.1.2:0 up
Targeted Hello: 192.168.1.1(LDP Id) -> 192.168.1.2, LDP is UP
Graceful restart: not configured and not enabled
Non stop routing: not configured and not enabled
Status TLV support (local/remote) : enabled/supported
LDP route watch : enabled
Label/status state machine : established, LruRrd
Last local dataplane status rcvd: No fault
Last BFD dataplane status rcvd: Not sent
Last BFD peer monitor status rcvd: No fault
Last local AC circuit status rcvd: No fault
Last local AC circuit status sent: DOWN(pw-tx-fault)
Last local PW i/f circ status rcvd: No fault
Last local LDP TLV status sent: No fault
Last remote LDP TLV status rcvd: DOWN(pw-tx-fault)
Last remote LDP ADJ status rcvd: No fault
MPLS VC labels: local 1655, remote 2399
Group ID: local 15, remote 8
MTU: local 1518, remote 1518
Remote interface description: xxxx
Sequencing: receive disabled, send disabled
Control Word: On (configured: autosense)
SSO Descriptor: 192.168.1.2/711, local label: 1655
Dataplane:
SSM segment/switch IDs: 4129/4128 (used), PWID: 2
VC statistics:
transit packet totals: receive 0, send 2197996926
transit byte totals: receive 0, send 3296995389000
transit packet drops: receive 0, seq error 0, send 0

[Harold Ritter]

Hi @CiscoBuddy1 ,

Can you please post the output from the same command from the peer router?

[CiscoBuddy1]

Hi @Harold Ritter ,

Issue is resolved, i found mpls ldp sync command missing in OSPF global configuration.

[Harold Ritter]

Hi @CiscoBuddy1 ,

I am glad the issue is resolved. Thanks for the feedback.

[MHM Cisco World]

You need to use pw-class and specify protocol and encap.

Also you need to be sure that IP use in xconnect is same as mpls ID if not then xconnect will be down.

MHM