cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
361
Views
1
Helpful
1
Replies

MPLS LDP Xconnect interface not forwarding traffic

adamspera
Beginner
Beginner

Hello! I am trying to set up the following topology, where the devices on the ends do not know the three middle devices are there.

Device #1 <> NCS5001 <> NCS5001 <> NCS5001 <> Device #2

I have set up OSPF on the NCS's to enable communication between them, and enabled MPLS LDP communication through OSPF. I have also created a Xconnect p2p group that is registering as UP UP. Though the end devices cannot communicate. I have attached some output relevant to the issue, as well as a text file with abbreviated running configs.

I believe the source of the issue is that the interface Ge0/0/0/0 on edgemost NCS's that connect to the client devices, are not transmitting any traffic, yet are receiving it? Interesting issue.

Thanks for any help or thoughts!

 

DEVICE #1 (leftmost)
RP/0/RP0/CPU0:ios#show mpls forwarding 
Wed May 17 02:12:49.061 UTC
Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       
Label  Label       or ID              Interface                    Switched    
------ ----------- ------------------ ------------ --------------- ------------
24000  Pop         PW(2.2.2.2:100)    Gi0/0/0/0    point2point     0           
24001  Pop         2.2.2.2/32         Gi0/0/0/15   10.0.0.2        27414       
24002  Pop         10.0.1.0/24        Gi0/0/0/15   10.0.0.2        0           
24003  24001       3.3.3.3/32         Gi0/0/0/15   10.0.0.2        0           
RP/0/RP0/CPU0:ios#sh l2vpn xconnect            
Wed May 17 02:13:06.317 UTC
Legend: ST = State, UP = Up, DN = Down, AD = Admin Down, UR = Unresolved,
        SB = Standby, SR = Standby Ready, (PP) = Partially Programmed,
        LU = Local Up, RU = Remote Up, CO = Connected, (SI) = Seamless Inactive

XConnect                   Segment 1                       Segment 2                
Group      Name       ST   Description            ST       Description            ST    
------------------------   -----------------------------   -----------------------------
test       p2p        UP   Gi0/0/0/0              UP       2.2.2.2         100    UP    
----------------------------------------------------------------------------------------
RP/0/RP0/CPU0:ios#sh int Gi0/0/0/0
Wed May 17 02:13:27.200 UTC
GigabitEthernet0/0/0/0 is up, line protocol is up 
  Interface state transitions: 1
  Hardware is GigabitEthernet, address is 00bc.60eb.7bc6 (bia 00bc.60eb.7bc6)
  Layer 2 Transport Mode
  MTU 1514 bytes, BW 1000000 Kbit (Max: 1000000 Kbit)
     reliability 255/255, txload 0/255, rxload 0/255
  Encapsulation ARPA,
  Full-duplex, 1000Mb/s, TFD, link type is force-up
  output flow control is off, input flow control is off
  Carrier delay (up) is 10 msec
  loopback not set,
  Last link flapped 01:25:18
  Last input 00:00:00, output never
  Last clearing of "show interface" counters never
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     628 packets input, 72700 bytes, 0 total input drops
     0 drops for unrecognized upper-level protocol
     Received 14 broadcast packets, 103 multicast packets
              0 runts, 0 giants, 0 throttles, 0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 packets output, 0 bytes, 0 total output drops
     Output 0 broadcast packets, 0 multicast packets
     0 output errors, 0 underruns, 0 applique, 0 resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions


RP/0/RP0/CPU0:ios#sh mpls l?
label  lctrl  ldp  lib
lsd    
RP/0/RP0/CPU0:ios#sh mpls ldp forwarding 
Wed May 17 02:19:04.337 UTC

Codes: 
  - = GR label recovering, (!) = LFA FRR pure backup path 
  {} = Label stack with multi-line output for a routing path
  G = GR, S = Stale, R = Remote LFA FRR backup
  E = Entropy label capability

Prefix          Label   Label(s)       Outgoing     Next Hop            Flags  
                In      Out            Interface                        G S R E
--------------- ------- -------------- ------------ ------------------- -------
2.2.2.2/32      24001   ImpNull        Gi0/0/0/15   10.0.0.2                   
3.3.3.3/32      24003   24001          Gi0/0/0/15   10.0.0.2                   
10.0.1.0/24     24002   ImpNull        Gi0/0/0/15   10.0.0.2                   
DEVICE #2 (middle)

RP/0/RP0/CPU0:ios#show mpls forwarding 
Wed May 17 02:12:49.061 UTC
Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       
Label  Label       or ID              Interface                    Switched    
------ ----------- ------------------ ------------ --------------- ------------
24000  Pop         PW(2.2.2.2:100)    Gi0/0/0/0    point2point     0           
24001  Pop         2.2.2.2/32         Gi0/0/0/15   10.0.0.2        27414       
24002  Pop         10.0.1.0/24        Gi0/0/0/15   10.0.0.2        0           
24003  24001       3.3.3.3/32         Gi0/0/0/15   10.0.0.2        0           
RP/0/RP0/CPU0:ios#sh l2vpn xconnect            
Wed May 17 02:13:06.317 UTC
Legend: ST = State, UP = Up, DN = Down, AD = Admin Down, UR = Unresolved,
        SB = Standby, SR = Standby Ready, (PP) = Partially Programmed,
        LU = Local Up, RU = Remote Up, CO = Connected, (SI) = Seamless Inactive

XConnect                   Segment 1                       Segment 2                
Group      Name       ST   Description            ST       Description            ST    
------------------------   -----------------------------   -----------------------------
test       p2p        UP   Gi0/0/0/0              UP       2.2.2.2         100    UP    
----------------------------------------------------------------------------------------
RP/0/RP0/CPU0:ios#sh int Gi0/0/0/0
Wed May 17 02:13:27.200 UTC
GigabitEthernet0/0/0/0 is up, line protocol is up 
  Interface state transitions: 1
  Hardware is GigabitEthernet, address is 00bc.60eb.7bc6 (bia 00bc.60eb.7bc6)
  Layer 2 Transport Mode
  MTU 1514 bytes, BW 1000000 Kbit (Max: 1000000 Kbit)
     reliability 255/255, txload 0/255, rxload 0/255
  Encapsulation ARPA,
  Full-duplex, 1000Mb/s, TFD, link type is force-up
  output flow control is off, input flow control is off
  Carrier delay (up) is 10 msec
  loopback not set,
  Last link flapped 01:25:18
  Last input 00:00:00, output never
  Last clearing of "show interface" counters never
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     628 packets input, 72700 bytes, 0 total input drops
     0 drops for unrecognized upper-level protocol
     Received 14 broadcast packets, 103 multicast packets
              0 runts, 0 giants, 0 throttles, 0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 packets output, 0 bytes, 0 total output drops
     Output 0 broadcast packets, 0 multicast packets
     0 output errors, 0 underruns, 0 applique, 0 resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions


RP/0/RP0/CPU0:ios#sh mpls l?
label  lctrl  ldp  lib
lsd    
RP/0/RP0/CPU0:ios#sh mpls ldp forwarding 
Wed May 17 02:19:04.337 UTC

Codes: 
  - = GR label recovering, (!) = LFA FRR pure backup path 
  {} = Label stack with multi-line output for a routing path
  G = GR, S = Stale, R = Remote LFA FRR backup
  E = Entropy label capability

Prefix          Label   Label(s)       Outgoing     Next Hop            Flags  
                In      Out            Interface                        G S R E
--------------- ------- -------------- ------------ ------------------- -------
2.2.2.2/32      24001   ImpNull        Gi0/0/0/15   10.0.0.2                   
3.3.3.3/32      24003   24001          Gi0/0/0/15   10.0.0.2                   
10.0.1.0/24     24002   ImpNull        Gi0/0/0/15   10.0.0.2                   
DEVICE #3 (rightmost)
RP/0/RP0/CPU0:ios#show mpls forwarding
Wed May 17 02:35:51.858 UTC
Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       
Label  Label       or ID              Interface                    Switched    
------ ----------- ------------------ ------------ --------------- ------------
24001  24000       1.1.1.1/32         Gi0/0/0/15   10.0.1.2        0           
24002  Pop         10.0.0.0/24        Gi0/0/0/15   10.0.1.2        0           
24003  Pop         2.2.2.2/32         Gi0/0/0/15   10.0.1.2        34998       
24005  Pop         PW(2.2.2.2:100)    Gi0/0/0/0    point2point     0           
RP/0/RP0/CPU0:ios#sh l2vpn xconnect
Wed May 17 02:35:58.768 UTC
Legend: ST = State, UP = Up, DN = Down, AD = Admin Down, UR = Unresolved,
        SB = Standby, SR = Standby Ready, (PP) = Partially Programmed,
        LU = Local Up, RU = Remote Up, CO = Connected

XConnect                   Segment 1                       Segment 2                
Group      Name       ST   Description            ST       Description            ST    
------------------------   -----------------------------   -----------------------------
test       p2p        UP   Gi0/0/0/0              UP       2.2.2.2         100    UP    
----------------------------------------------------------------------------------------
RP/0/RP0/CPU0:ios#sh int Gi0/0/0/0
Wed May 17 02:36:05.159 UTC
GigabitEthernet0/0/0/0 is up, line protocol is up 
  Interface state transitions: 3
  Hardware is GigabitEthernet, address is c472.95a7.b206 (bia c472.95a7.b206)
  Layer 2 Transport Mode
  MTU 1514 bytes, BW 1000000 Kbit (Max: 1000000 Kbit)
     reliability 255/255, txload 0/255, rxload 0/255
  Encapsulation ARPA,
  Full-duplex, 1000Mb/s, TFD, link type is force-up
  output flow control is off, input flow control is off
  Carrier delay (up) is 10 msec
  loopback not set,
  Last link flapped 01:26:55
  Last input 00:00:00, output 01:26:57
  Last clearing of "show interface" counters never
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     703 packets input, 84207 bytes, 0 total input drops
     19 drops for unrecognized upper-level protocol
     Received 6 broadcast packets, 123 multicast packets
              0 runts, 0 giants, 0 throttles, 0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     28 packets output, 5389 bytes, 0 total output drops
     Output 5 broadcast packets, 23 multicast packets
RP/0/RP0/CPU0:ios#sh mpls ldp forwarding
Wed May 17 02:36:18.018 UTC

Codes: 
  - = GR label recovering, (!) = LFA FRR pure backup path 
  {} = Label stack with multi-line output for a routing path
  G = GR, S = Stale, R = Remote LFA FRR backup
  E = Entropy label capability

Prefix          Label   Label(s)       Outgoing     Next Hop            Flags  
                In      Out            Interface                        G S R E
--------------- ------- -------------- ------------ ------------------- -------
1.1.1.1/32      24001   24000          Gi0/0/0/15   10.0.1.2                   
2.2.2.2/32      24003   ImpNull        Gi0/0/0/15   10.0.1.2                   
10.0.0.0/24     24002   ImpNull        Gi0/0/0/15   10.0.1.2                   

 

Thanks again!

1 Accepted Solution

Accepted Solutions

Harold Ritter
Cisco Employee
Cisco Employee

Hi @adamspera ,

You need to run the pseudowire between the two end NCS devices, not to the middle one.

DEVICE #1 RUNNING (left)

l2vpn     

 xconnect group test

  p2p p2p

   interface GigabitEthernet0/0/0/0

   neighbor ipv4 3.3.3.3 pw-id 100

 DEVICE #3 (right most) running

l2vpn     

 xconnect group test

  p2p p2p

   interface GigabitEthernet0/0/0/0

   neighbor ipv4 1.1.1.1 pw-id 100

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

View solution in original post

1 Reply 1

Harold Ritter
Cisco Employee
Cisco Employee

Hi @adamspera ,

You need to run the pseudowire between the two end NCS devices, not to the middle one.

DEVICE #1 RUNNING (left)

l2vpn     

 xconnect group test

  p2p p2p

   interface GigabitEthernet0/0/0/0

   neighbor ipv4 3.3.3.3 pw-id 100

 DEVICE #3 (right most) running

l2vpn     

 xconnect group test

  p2p p2p

   interface GigabitEthernet0/0/0/0

   neighbor ipv4 1.1.1.1 pw-id 100

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: