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!
