Pinging across an LSP from Cisco<--Juniper--->Cisco

From: Martin, Christian (cmartin@gnilink.net)
Date: Sun Aug 05 2001 - 23:12:08 EDT


Folks,

I am having an problem pinging across an LSP built between two Cisco 12012s
running 12.0(16)S, through 3 Juniper M20s running 4.4R2.3. I can
successfully trace across the tunnel. I have tried using both explicit and
implict null signalling. The penultimate hop on both simplex LSPs shows
packets traversing. Performing a debug IP packet detail shows the tunnel
process switching the packet (via cef) through the appropriate outbound
interface that the tunnel lives. CEF tables look clean. Pings do not show
up on the other side when debugging, however. I have autoroute announce
configured on the LSPs.

Any help would be appreciated...

TIA,
-chris

Here is some info: (One of the things that seems funny is that the tail of
the LSP is saying "implicit-null", yet it is signalling explicit null in the
RESV message. Maybe the cisco is not expecting to receive labeled packets?)

The topology is as follows:

     P1------P3------P5
    / | | | \
   / | | | \
PE2 | | | PE1
   \ | | | /
    \ | | | /
     P2------P4------P6

R4.04-GSR8-PE2#p 10.0.0.8

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.0.8, timeout is 2 seconds:

05:00:57: IP-CEF: process switch tunnel: Tunnel0->ATM4/0.841
05:00:57: IP: s=10.0.0.7 (local), d=10.0.0.8, len 100, cef process switched
05:00:57: ICMP type=8, code=0.
05:00:59: IP-CEF: process switch tunnel: Tunnel0->ATM4/0.841
05:00:59: IP: s=10.0.0.7 (local), d=10.0.0.8, len 100, cef process switched
05:00:59: ICMP type=8, code=0.
 <-snip->

R4.04-GSR8-PE2#sh mpls traffic-eng tunnels

Name: PE2<->PE1 (Tunnel0) Destination: 10.0.0.8
  Status:
    Admin: up Oper: up Path: valid Signalling: connected

    path option 1, type dynamic (Basis for Setup, path weight 40)

  Config Paramters:
    Bandwidth: 0 Priority: 7 7 Affinity: 0x0/0xFFFF
    AutoRoute: enabled LockDown: disabled Loadshare: 0 bw-based

  InLabel : -
  OutLabel : ATM4/0.841, 100024
  RSVP Signalling Info:
       Src 10.0.0.7, Dst 10.0.0.8, Tun_Id 0, Tun_Instance 73
    RSVP Path Info:
      My Address: 10.0.0.7
      Explicit Route: 192.168.1.37 192.168.1.10 192.168.1.22 192.168.1.30
                      10.0.0.8
      Record Route:
      Tspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits
    RSVP Resv Info:
      Record Route: NONE
      Fspec: ave rate=0 kbits, burst=1000 bytes, peak rate=Inf

LSP Tunnel PE1<->PE2 is signalled, connection is up
  InLabel : ATM4/0.841, implicit-null <<<<-------------------*************
  OutLabel : -
  RSVP Signalling Info:
       Src 10.0.0.8, Dst 10.0.0.7, Tun_Id 0, Tun_Instance 71
    RSVP Path Info:
      My Address: 10.0.0.7
      Explicit Route: NONE
      Record Route: NONE
      Tspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits
    RSVP Resv Info:
      Record Route: NONE
      Fspec: ave rate=0 kbits, burst=1000 bytes, peak rate=Inf
R4.04-GSR8-PE2#

R4.04-GSR8-PE2#sh int lo0
Loopback0 is up, line protocol is up
  Hardware is Loopback
  Internet address is 10.0.0.7/32
  MTU 1514 bytes, BW 8000000 Kbit, DLY 5000 usec, rely 255/255, load 1/255
  Encapsulation LOOPBACK, loopback not set
  Last input 00:00:08, output never, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  Output queue 0/0, 0 drops; input queue 0/75, 0 drops
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     2070 packets output, 3133980 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
R4.04-GSR8-PE2#

R4.04-GSR8-PE2#sh ip cef 10.0.0.8 internal
10.0.0.8/32, version 53
0 packets, 0 bytes
  tag information set, shared
    local tag: tunnel-head
    fast tag rewrite with Tu0, point2point, tags imposed: {100024}
  via 10.0.0.8, Tunnel0, 1 dependency
    next hop 10.0.0.8, Tunnel0
    valid adjacency
    tag rewrite with Tu0, point2point, tags imposed: {100024}
R4.04-GSR8-PE2#

R4.04-GSR8-PE2#sh mpls traffic-eng forwarding-adjacency
  destination 0000.0000.0008.00 has 1 tunnels
R4.04-GSR8-PE2#

R4.04-GSR8-PE2#sh mpls traffic-eng autoroute
MPLS TE autorouting enabled
  destination 0000.0000.0008.00 has 1 tunnels
    Tunnel0 (traffic share 0, nexthop 10.0.0.8)
                (flags: Announce)
R4.04-GSR8-PE2#

R4.04-GSR8-PE2#sh clns is-neighbors

System Id Interface State Type Priority Circuit Id Format
R3.4-M20-P2 AT4/0.841 Up L2 0 00 Phase V
R3.4-M20-P1 AT4/0.840 Up L2 0 00 Phase V
R4.04-GSR8-PE2#

******** On the Penultimate hop....

lab@R3.4-M20-P2> show mpls lsp name PE1<->PE2 extensive
Ingress LSP: 5 sessions
Total 0 displayed, Up 0, Down 0

Egress LSP: 6 sessions
Total 0 displayed, Up 0, Down 0

Transit LSP: 3 sessions

10.0.0.7
  From: 10.0.0.8, LSPstate: Up, ActiveRoute: 1, LSPname: PE1<->PE2
  Resv style: 1 SE, Label in: 100025, Label out: 0 <<<<---------------****
  Time left: 150, Since: Sun Aug 5 21:44:39 2001
  Tspec: rate 0bps size 8kbps peak 0bps m 0 M 0
  Port number: sender 71 receiver 0 protocol 0
  PATH rcvfrom: 192.168.1.10 (at-0/3/0.834) 417 pkts
  PATH sentto: 192.168.1.38 (at-0/3/0.841) 416 pkts
  RESV rcvfrom: 192.168.1.38 (at-0/3/0.841) 619 pkts
  Explct route: 192.168.1.38 10.0.0.7
Total 1 displayed, Up 1, Down 0

lab@R3.4-M20-P2>

lab@R3.4-M20-P2> show mpls lsp name PE1<->PE2 statistics
Ingress LSP: 5 sessions
Total 0 displayed, Up 0, Down 0

Egress LSP: 6 sessions
Total 0 displayed, Up 0, Down 0

Transit LSP: 3 sessions
To From State Packets Bytes LSPname
10.0.0.7 10.0.0.8 Up 14 1280 PE1<->PE2
Total 1 displayed, Up 1, Down 0

lab@R3.4-M20-P2>

lab@R3.4-M20-P2> show mpls lsp name PE2<->PE1 extensive
Ingress LSP: 5 sessions
Total 0 displayed, Up 0, Down 0

Egress LSP: 6 sessions
Total 0 displayed, Up 0, Down 0

Transit LSP: 3 sessions

10.0.0.8
  From: 10.0.0.7, LSPstate: Up, ActiveRoute: 1, LSPname: PE2<->PE1
  Resv style: 1 SE, Label in: 100024, Label out: 100052
  Time left: 158, Since: Sun Aug 5 21:44:32 2001
  Tspec: rate 0bps size 8kbps peak 0bps m 0 M 0
  Port number: sender 73 receiver 0 protocol 0
  PATH rcvfrom: 192.168.1.38 (at-0/3/0.841) 933 pkts
  PATH sentto: 192.168.1.10 (at-0/3/0.834) 417 pkts
  RESV rcvfrom: 192.168.1.10 (at-0/3/0.834) 418 pkts
  Explct route: 192.168.1.10 192.168.1.22 192.168.1.30 10.0.0.8
  Record route: 192.168.1.38 <self> ...incomplete
Total 1 displayed, Up 1, Down 0

lab@R3.4-M20-P2>

lab@R3.4-M20-P2> show mpls lsp name PE2<->PE1 statistics
Ingress LSP: 5 sessions
Total 0 displayed, Up 0, Down 0

Egress LSP: 6 sessions
Total 0 displayed, Up 0, Down 0

Transit LSP: 3 sessions
To From State Packets Bytes LSPname
10.0.0.8 10.0.0.7 Up 43 3176 PE2<->PE1
Total 1 displayed, Up 1, Down 0

lab@R3.4-M20-P2>

On the other end...

R4.05-GSR-PE1#sh mpls traff tunnels

Name: PE1<->PE2 (Tunnel0) Destination: 10.0.0.7
  Status:
    Admin: up Oper: up Path: valid Signalling: connected

    path option 1, type dynamic (Basis for Setup, path weight 40)

  Config Paramters:
    Bandwidth: 0 Priority: 7 7 Affinity: 0x0/0xFFFF
    AutoRoute: enabled LockDown: disabled Loadshare: 0 bw-based

  InLabel : -
  OutLabel : ATM9/0.843, 100052
  RSVP Signalling Info:
       Src 10.0.0.8, Dst 10.0.0.7, Tun_Id 0, Tun_Instance 71
    RSVP Path Info:
      My Address: 10.0.0.8
      Explicit Route: 192.168.1.29 192.168.1.21 192.168.1.9 192.168.1.38
                      10.0.0.7
      Record Route: NONE
      Tspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits
    RSVP Resv Info:
      Record Route: NONE
      Fspec: ave rate=0 kbits, burst=1000 bytes, peak rate=Inf

LSP Tunnel PE2<->PE1 is signalled, connection is up
  InLabel : ATM9/0.843, implicit-null
  OutLabel : -
  RSVP Signalling Info:
       Src 10.0.0.7, Dst 10.0.0.8, Tun_Id 0, Tun_Instance 73
    RSVP Path Info:
      My Address: 10.0.0.8
      Explicit Route: NONE
      Record Route: NONE
      Tspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits
    RSVP Resv Info:
      Record Route: NONE
      Fspec: ave rate=0 kbits, burst=1000 bytes, peak rate=Inf
R4.05-GSR-PE1#

R4.05-GSR-PE1#sh ip cef 10.0.0.7 in
10.0.0.7/32, version 56
0 packets, 0 bytes
  tag information set, shared
    local tag: tunnel-head
    fast tag rewrite with Tu0, point2point, tags imposed: {100052}
  via 10.0.0.7, Tunnel0, 3 dependencies
    next hop 10.0.0.7, Tunnel0
    valid adjacency
    tag rewrite with Tu0, point2point, tags imposed: {100052}
R4.05-GSR-PE1#

R4.05-GSR-PE1#sh clns is-neighbors

System Id Interface State Type Priority Circuit Id Format
R4.3-M20-P6 AT9/0.843 Up L2 0 00 Phase V
R4.3-M20-P5 AT9/0.842 Up L2 0 00 Phase V
R4.05-GSR-PE1#

lab@R4.3-M20-P6> show mpls lsp name PE2<->PE1 extensive
Ingress LSP: 5 sessions
Total 0 displayed, Up 0, Down 0

Egress LSP: 5 sessions
Total 0 displayed, Up 0, Down 0

Transit LSP: 4 sessions

10.0.0.8
  From: 10.0.0.7, LSPstate: Up, ActiveRoute: 1, LSPname: PE2<->PE1
  Resv style: 1 SE, Label in: 100051, Label out: 0
  Time left: 125, Since: Sun Aug 5 21:50:26 2001
  Tspec: rate 0bps size 8kbps peak 0bps m 0 M 0
  Port number: sender 73 receiver 0 protocol 0
  PATH rcvfrom: 192.168.1.21 (at-0/2/0.837) 414 pkts
  PATH sentto: 192.168.1.30 (at-0/2/0.843) 413 pkts
  RESV rcvfrom: 192.168.1.30 (at-0/2/0.843) 608 pkts
  Explct route: 192.168.1.30 10.0.0.8
  Record route: 192.168.1.38 192.168.1.9 192.168.1.21 <self>
...incomplete
Total 1 displayed, Up 1, Down 0

lab@R4.3-M20-P6>

lab@R4.3-M20-P6> show mpls lsp name PE1<->PE2 extensive
Ingress LSP: 5 sessions
Total 0 displayed, Up 0, Down 0

Egress LSP: 5 sessions
Total 0 displayed, Up 0, Down 0

Transit LSP: 4 sessions

10.0.0.7
  From: 10.0.0.8, LSPstate: Up, ActiveRoute: 1, LSPname: PE1<->PE2
  Resv style: 1 SE, Label in: 100052, Label out: 100053
  Time left: 133, Since: Sun Aug 5 21:50:33 2001
  Tspec: rate 0bps size 8kbps peak 0bps m 0 M 0
  Port number: sender 71 receiver 0 protocol 0
  PATH rcvfrom: 192.168.1.30 (at-0/2/0.843) 893 pkts
  PATH sentto: 192.168.1.21 (at-0/2/0.837) 410 pkts
  RESV rcvfrom: 192.168.1.21 (at-0/2/0.837) 411 pkts
  Explct route: 192.168.1.21 192.168.1.9 192.168.1.38 10.0.0.7
Total 1 displayed, Up 1, Down 0

lab@R4.3-M20-P6>



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