Solved: Hi Akash,Thank you so much!

antione-smith · ‎10-13-2015

Hola.

Need quick help to identify where MPLS LDP issue is, PE to P, take a look below, can be quick fix, but interesting issue.

I have 7606 MPLS PE router, IOS Version 12.2(33)SRC4, with following mods:

1-subslot SPA Interface Processor-600 7600-SIP-600 <--- link to P router

Supervisor Engine 720 (Active) WS-SUP720-3BXL

Directly connected to 12416/PRP MPLS P router, Version 3.5.2, at remote site via optical DWDM.

0/8/CPU0 PRP(Active) N/A IOS XR

0/10/0 SPA SPA-10X1GE-V2

7606 was recently fully reconfigured for restoration after full site outage and MPLS vpn forwarding plane lost connectivity since.

PE1#sh mpls interf
Interface IP Tunnel BGP Static Operational
GigabitEthernet1/0/0 Yes (ldp) Yes No No Yes

PE1#ping vrf 65001 10.120.4.1 repeat 2 <-- L3vpn interface on remote PE

Type escape sequence to abort.
Sending 2, 100-byte ICMP Echos to 10.120.4.1, timeout is 2 seconds:
..
Success rate is 0 percent (0/2)

PE1#sh ip cef vrf 65001 10.120.4.1
10.120.4.0/27
nexthop 10.100.104.181 GigabitEthernet1/0/0 unusable: no label

PE1#trace mpls ipv4 10.100.100.2 255.255.255.255
Tracing MPLS Label Switched Path to 10.100.100.2/32, timeout is 2 seconds

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,
'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.
0 10.100.104.182 MRU 0 [No Label]
Q 1 *

PE1#sh run int GigabitEthernet1/0/0
!
interface GigabitEthernet1/0/0
description Connection to P1
mtu 9180
ip address 10.100.104.182 255.255.255.252
ip ospf message-digest-key 1 md5
ip ospf network point-to-point
speed nonegotiate
mls qos trust dscp
mpls traffic-eng tunnels
mpls ip
bfd interval 100 min_rx 100 multiplier 3

Control plane looks normal

PE1#sh ip route vrf 65001 10.120.4.1

Routing Table: 65001
Routing entry for 10.120.4.0/27
Known via "bgp 65500", distance 200, metric 0, type internal
Last update from 10.100.100.2 03:55:00 ago
Routing Descriptor Blocks:
* 10.100.100.2 (default), from 10.100.100.4, 03:55:00 ago
Route metric is 0, traffic share count is 1
AS Hops 0
MPLS Required

PE1#sh mpls ldp neigh 10.100.100.2 detail <-- remote PE router
Peer LDP Ident: 10.100.100.2:0; Local LDP Ident 10.100.100.214:0
TCP connection: 10.100.100.2.646 - 10.100.100.214.34284
Password: not required, none, in use
State: Oper; Msgs sent/rcvd: 2288/739; Downstream; Last TIB rev sent 1138
Up time: 06:42:10; UID: 10476; Peer Id 2;
LDP discovery sources:
Targeted Hello 10.100.100.214 -> 10.100.100.2, active, passive;
holdtime: infinite, hello interval: 10000 ms
Addresses bound to peer LDP Ident:
10.100.100.2 10.10.1.90 10.10.2.223 10.100.111.1
10.100.101.49 10.100.115.5 10.100.101.57 10.100.101.69
10.100.111.254 10.100.101.2
Peer holdtime: 180000 ms; KA interval: 60000 ms; Peer state: estab
Clients: Dir Adj Client

PE1#sh run | sec mpls
mpls traffic-eng tunnels
mpls ldp neighbor 10.100.100.1 password 7 130603304F5D1407
mpls ldp graceful-restart timers max-recovery 600
mpls ldp graceful-restart
no mpls ip propagate-ttl forwarded
mpls label protocol ldp
match mpls experimental topmost 1 3 6
match mpls experimental topmost 5
match mpls experimental topmost 4
neighbor 10.100.100.129 encapsulation mpls
neighbor 10.100.100.220 encapsulation mpls
neighbor 10.100.100.75 encapsulation mpls
neighbor 10.100.100.193 encapsulation mpls
neighbor 10.100.100.83 encapsulation mpls
neighbor 10.100.100.203 encapsulation mpls
neighbor 10.100.100.2 encapsulation mpls
neighbor 10.100.100.136 encapsulation mpls
neighbor 10.100.100.3 encapsulation mpls
neighbor 10.100.100.83 encapsulation mpls
neighbor 10.100.100.14 encapsulation mpls
neighbor 10.100.100.2 encapsulation mpls
neighbor 10.100.100.5 encapsulation mpls
neighbor 10.100.100.8 encapsulation mpls
neighbor 10.100.100.203 encapsulation mpls
neighbor 10.100.100.65 encapsulation mpls
neighbor 10.100.100.11 encapsulation mpls
neighbor 10.100.100.12 encapsulation mpls
neighbor 10.100.100.83 encapsulation mpls
neighbor 10.100.100.203 encapsulation mpls
neighbor 10.100.100.14 encapsulation mpls
neighbor 10.100.100.73 encapsulation mpls
neighbor 10.100.100.193 encapsulation mpls
neighbor 10.100.100.138 encapsulation mpls
neighbor 10.100.100.83 encapsulation mpls
neighbor 10.100.100.65 encapsulation mpls
neighbor 10.100.100.5 encapsulation mpls
neighbor 10.100.100.220 encapsulation mpls
neighbor 10.100.100.203 encapsulation mpls
neighbor 10.100.100.136 encapsulation mpls
neighbor 10.100.100.132 encapsulation mpls
neighbor 10.100.100.129 encapsulation mpls
neighbor 10.100.100.75 encapsulation mpls
neighbor 10.100.100.3 encapsulation mpls
neighbor 10.100.100.220 encapsulation mpls
neighbor 10.100.100.75 encapsulation mpls
neighbor 10.100.100.14 encapsulation mpls
neighbor 10.100.100.8 encapsulation mpls
neighbor 10.100.100.14 encapsulation mpls
neighbor 10.100.100.132 encapsulation mpls
neighbor 10.100.100.134 encapsulation mpls
neighbor 10.100.100.129 encapsulation mpls
neighbor 10.100.100.193 encapsulation mpls
neighbor 10.100.100.220 encapsulation mpls
neighbor 10.100.100.75 encapsulation mpls
neighbor 10.100.100.218 encapsulation mpls
neighbor 10.100.100.203 encapsulation mpls
neighbor 10.100.100.138 encapsulation mpls
neighbor 10.100.100.83 encapsulation mpls
neighbor 10.100.100.65 encapsulation mpls
neighbor 10.100.100.136 encapsulation mpls
neighbor 10.100.100.14 encapsulation mpls
mpls traffic-eng tunnels
mpls ip
mpls ip
mpls traffic-eng tunnels
mpls ip
xconnect 10.100.100.3 4056 encapsulation mpls
backup peer 10.100.100.2 4055
xconnect 10.100.100.3 3056 encapsulation mpls
backup peer 10.100.100.2 3055
xconnect 10.100.100.3 5104 encapsulation mpls
xconnect 10.100.100.3 5105 encapsulation mpls
mpls traffic-eng router-id Loopback0
mpls traffic-eng area 0
mpls traffic-eng multicast-intact
neighbor mpls_peer peer-group
neighbor mpls_peer remote-as 65500
neighbor mpls_peer update-source Loopback0
neighbor 10.100.100.4 peer-group mpls_peer
neighbor 10.100.100.66 peer-group mpls_peer
neighbor mpls_peer send-community extended
snmp-server enable traps mpls ldp
snmp-server enable traps mpls vpn
mpls ldp router-id Loopback0

------------ P router -------------------

P1#sh mpls interf
Interface LDP Tunnel Enabled
-------------------------- -------- -------- --------
GigabitEthernet0/10/0/2 Yes No Yes

P1#sh run int GigabitEthernet0/10/0/2
interface GigabitEthernet0/10/0/2
description "Connection to PE1 gi1/0/1"
cdp
mtu 9194
ipv4 address 10.100.104.181 255.255.255.252
load-interval 30

P1#sh mpls ldp neigh brief

Peer GR Up Time Discovery Address
----------------- -- --------------- --------- -------
10.100.100.23:0 Y 21w6d 2 9
10.100.100.2:0 Y 21w6d 1 10
10.100.100.11:0 Y 21w6d 1 3
10.100.100.64:0 Y 20w4d 1 6
10.100.100.128:0 Y 5w4d 1 4
10.100.100.12:0 Y 3w5d 1 3
10.100.100.32:0 N 4d17h 1 3

P1#sh mpls ldp neigh 10.100.100.214 <--- no output for LDP adjacency for PE1

P1#sh mpls ldp neigh 10.100.100.2

Peer LDP Identifier: 10.100.100.2:0
TCP connection: 10.100.100.2:43822 - 10.100.100.1:646; MD5 on
Graceful Restart: Yes (Reconnect Timeout: 120 sec, Recovery: 0 sec)
Session Holdtime: 180 sec
State: Oper; Msgs sent/rcvd: 255213/255123
Up time: 21w6d
LDP Discovery Sources:
TenGigE0/0/0/0
Addresses bound to this peer:
10.10.1.90 10.10.2.223 10.100.100.2 10.100.101.2
10.100.101.49 10.100.101.57 10.100.101.69 10.100.111.1
10.100.111.254 10.100.115.5

P1#sh run

mpls ldp
router-id 10.100.100.1
log
neighbor
graceful-restart
!
discovery targeted-hello accept
graceful-restart
graceful-restart reconnect-timeout 300
graceful-restart forwarding-state-holdtime 600
neighbor 10.100.100.2 password encrypted 011012261F5A1622
neighbor 10.100.100.3 password encrypted 110A0D2753431B21
neighbor 10.100.100.5 password encrypted 011012261F5A1622
neighbor 10.100.100.8 password encrypted 0508122D651D5E24
neighbor 10.100.100.11 password encrypted 011012261F5A1622
neighbor 10.100.100.12 password encrypted 094F5A2B5D54073F
neighbor 10.100.100.14 password encrypted 121A1135565A1C29
neighbor 10.100.100.23 password encrypted 12495446425A5E567C7A027D1264744155
neighbor 10.100.100.32 password encrypted 15111F2E407B3B09
neighbor 10.100.100.64 password encrypted 011012261F5A1622
neighbor 10.100.100.74 password encrypted 0508122D651D5E24
neighbor 10.100.100.128 password encrypted 011012261F5A1622
neighbor 10.100.100.192 password encrypted 094F5A2B5D54073F
neighbor 10.100.100.214 password encrypted 06051B03081F3934
neighbor 10.100.101.18 password encrypted 121A0C041104
neighbor 10.100.101.18 targeted
interface GigabitEthernet0/10/0/1
!
interface GigabitEthernet0/10/0/2
!
interface GigabitEthernet0/11/0/0
!
interface TenGigE0/0/0/0
!
interface TenGigE0/1/0/0
!
interface TenGigE0/2/0/0
!
interface TenGigE0/3/0/0
!
interface TenGigE0/4/0/0
!
interface TenGigE0/5/0/0
!
interface TenGigE0/6/0/0
!
interface TenGigE0/12/0/0
!
interface TenGigE0/13/0/0
!
interface POS0/9/3/0

Akash Agrawal · ‎10-14-2015

Hi,

LDP is not coming up due to password mismatch. On PE1 you have configured ctB$1pM while on core it is ctB$1PM. Please correct password on either side and check if LDP comes up.

From below logs it is clear that both routers are able to transmit/receive each other's LDP hello. It should be related to password only.

PE1#sh mpls ldp disc

Local LDP Identifier:

10.100.100.214:0

Discovery Sources:

Interfaces:

GigabitEthernet1/0/0 (ldp): xmit/recv

LDP Id: 10.100.100.1:0

P1#sh mpls ldp discov

Local LDP Identifier: 10.100.100.1:0
Discovery Sources:
Interfaces:

GigabitEthernet0/10/0/2 : xmit/recv

LDP Id: 10.100.100.214:0, Transport address: 10.100.100.214
Hold time: 15 sec (local:15 sec, peer:15 sec)

View solution in original post

Vinit Jain · ‎10-13-2015

Hello,

First of all I want to point out that you are using pretty old code on both the PE and the P router. its necessary to upgrade the software on both these routers.

Coming to the problem, so you are seeing LDP neighborship from one side but not from other. Is that correct. Could you please confirm if you have loopback to loopback reachability between PE and P router.

Could you please share the below output:

- show mpls ldp bindings <P_loopback> (on PE1)
- show tcp brief | in .646
- show mls cef exception status

- were there any recent changes done on the router after which this problem was triggered.

Also, please capture the show log output (in a file) from the PE router to see if there are any error logs reported. if there is any problem on the 7600 platform, you might be get some errors there.

Regards

Vinit

Thanks
--Vinit

antione-smith · ‎10-14-2015

Hi Vint,

Thanks for reply.. I agree, code on these boxes are too old, but the boxes will swap out soon.

Actually, I am not seeing LDP from both ways:

P to PE via loopback

P1#sh ip route 10.100.100.214

Routing entry for 10.100.100.214/32
Known via "ospf 100", distance 110, metric 11, type intra area
Installed Oct 13 14:38:27.650
Routing Descriptor Blocks
10.100.104.182, from 10.100.100.214, via GigabitEthernet0/10/0/2
Route metric is 11
No advertising protos.

P1#sh run int loo0
interface Loopback0
ipv4 address 10.100.100.1 255.255.255.255

P1#ping 10.100.100.214 source loopback0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.100.100.214, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 6/6/7 ms

P1#sh tcp brief | in .646
0x482784a8 0 0 10.100.100.1:646 10.100.100.23:44187 ESTAB
0x4829c450 0 0 10.100.100.1:646 10.100.100.2:43822 ESTAB
0x48299670 0 0 10.100.100.1:646 10.100.100.64:17206 ESTAB
0x48297654 0 0 10.100.100.1:646 10.100.100.128:21443 ESTAB
0x482992fc 0 0 10.100.100.1:646 10.100.100.11:41045 ESTAB
0x4829a004 0 0 10.100.100.1:646 10.100.100.12:50278 ESTAB
0x4829751c 0 0 10.100.100.1:646 10.100.100.32:30817 ESTAB
0x48296134 0 0 0.0.0.0:646 0.0.0.0:0 LISTEN

P1#sh cef exceptions
CEF Exception Statistics
Node: 0/0/CPU0
Slow encap packets : 0
Unsupported packets : 0
Redirect packets : 0
Receive packets : 110696
Broadcast packets : 0
IP options packets : 1
TTL expired packets : 5155941
Fragmented packets : 0
Node: 0/1/CPU0
Slow encap packets : 0
Unsupported packets : 0
Redirect packets : 0
Receive packets : 0
Broadcast packets : 0
IP options packets : 0
TTL expired packets : 0
Fragmented packets : 0
Node: 0/2/CPU0
Slow encap packets : 0
Unsupported packets : 0
Redirect packets : 0
Receive packets : 0
Broadcast packets : 0
IP options packets : 0
TTL expired packets : 0
Fragmented packets : 0
Node: 0/3/CPU0
Slow encap packets : 0
Unsupported packets : 0
Redirect packets : 0
Receive packets : 0
Broadcast packets : 0
IP options packets : 0
TTL expired packets : 0
Fragmented packets : 0
Node: 0/4/CPU0
Slow encap packets : 0
Unsupported packets : 0
Redirect packets : 0
Receive packets : 1
Broadcast packets : 0
IP options packets : 0
TTL expired packets : 4835749
Fragmented packets : 0
Node: 0/5/CPU0
Slow encap packets : 0
Unsupported packets : 0
Redirect packets : 0
Receive packets : 1
Broadcast packets : 0
IP options packets : 0
TTL expired packets : 4834837
Fragmented packets : 0
Node: 0/6/CPU0
Slow encap packets : 0
Unsupported packets : 0
Redirect packets : 0
Receive packets : 0
Broadcast packets : 0
IP options packets : 0
TTL expired packets : 0
Fragmented packets : 0
Node: 0/8/CPU0
Slow encap packets : 16
Unsupported packets : 0
Redirect packets : 0
Receive packets : 90
Broadcast packets : 0
IP options packets : 0
TTL expired packets : 0
Fragmented packets : 0
Node: 0/9/CPU0
Slow encap packets : 0
Unsupported packets : 0
Redirect packets : 0
Receive packets : 7166323
Broadcast packets : 0
IP options packets : 0
TTL expired packets : 6844725
Fragmented packets : 0
Node: 0/10/CPU0
Slow encap packets : 2
Unsupported packets : 0
Redirect packets : 0
Receive packets : 2869
Broadcast packets : 0
IP options packets : 0
TTL expired packets : 5037355
Fragmented packets : 0
Node: 0/12/CPU0
Slow encap packets : 0
Unsupported packets : 0
Redirect packets : 0
Receive packets : 167
Broadcast packets : 0
IP options packets : 0
TTL expired packets : 4956397
Fragmented packets : 0
Node: 0/13/CPU0
Slow encap packets : 0
Unsupported packets : 0
Redirect packets : 0
Receive packets : 5
Broadcast packets : 0
IP options packets : 0
TTL expired packets : 4931750
Fragmented packets :

P1#sh mpls ldp discov

Local LDP Identifier: 10.100.100.1:0
Discovery Sources:
Interfaces:
GigabitEthernet0/10/0/1 : xmit/recv
LDP Id: 10.100.100.128:0, Transport address: 10.100.100.128
Hold time: 15 sec (local:15 sec, peer:15 sec)

GigabitEthernet0/10/0/2 : xmit/recv
LDP Id: 10.100.100.214:0, Transport address: 10.100.100.214
Hold time: 15 sec (local:15 sec, peer:15 sec)

POS0/9/3/0 : xmit/recv
LDP Id: 10.100.100.32:0, Transport address: 10.100.100.32
Hold time: 15 sec (local:15 sec, peer:15 sec)

TenGigE0/0/0/0 : xmit/recv
LDP Id: 10.100.100.2:0, Transport address: 10.100.100.2
Hold time: 15 sec (local:15 sec, peer:15 sec)

TenGigE0/12/0/0 : xmit/recv
LDP Id: 10.100.100.23:0, Transport address: 10.100.100.23
Hold time: 15 sec (local:15 sec, peer:15 sec)

TenGigE0/13/0/0 : xmit/recv
LDP Id: 10.100.100.64:0, Transport address: 10.100.100.64
Hold time: 15 sec (local:15 sec, peer:15 sec)

TenGigE0/4/0/0 : xmit/recv
LDP Id: 10.100.100.11:0, Transport address: 10.100.101.18
Hold time: 15 sec (local:15 sec, peer:15 sec)

TenGigE0/5/0/0 : xmit/recv
LDP Id: 10.100.100.12:0, Transport address: 10.100.100.12
Hold time: 15 sec (local:15 sec, peer:15 sec)

Targeted Hellos:
10.100.100.1 -> 10.100.101.18 (active), xmit/recv
LDP Id: 10.100.100.11:0
Hold time: 90 sec (local:90 sec, peer:90 sec)

10.100.100.1 -> 10.100.100.23 (passive), xmit/recv
LDP Id: 10.100.100.23:0
Hold time: 90 sec (local:90 sec, peer:90 sec)

Broken PE to P

PE1#ping 10.100.100.1 sour loop0

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.100.100.1, timeout is 2 seconds:
Packet sent with a source address of 10.100.100.214
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/9/12 ms

PE1#sh ip route 10.100.100.1
Routing entry for 10.100.100.1/32
Known via "ospf 100", distance 110, metric 11, type intra area
Last update from 10.100.104.181 on GigabitEthernet1/0/0, 15:47:00 ago
Routing Descriptor Blocks:
* 10.100.104.181, from 10.100.100.1, 15:47:00 ago, via GigabitEthernet1/0/0
Route metric is 11, traffic share count is 1

PE1#sh mpls ldp bind 10.100.100.1 255.255.255.255
lib entry: 10.100.100.1/32, rev 749
local binding: label: 262
remote binding: lsr: 10.100.100.83:0, label: 562
remote binding: lsr: 10.100.100.3:0, label: 381
remote binding: lsr: 10.100.100.2:0, label: 3703
remote binding: lsr: 10.100.100.12:0, label: 121
remote binding: lsr: 10.100.100.73:0, label: 226
remote binding: lsr: 10.100.100.75:0, label: 525
remote binding: lsr: 10.100.100.14:0, label: 203
remote binding: lsr: 10.100.100.129:0, label: 47
remote binding: lsr: 10.100.100.193:0, label: 243
remote binding: lsr: 10.100.100.132:0, label: 245
remote binding: lsr: 10.100.100.65:0, label: 1822
remote binding: lsr: 10.100.100.5:0, label: 194
remote binding: lsr: 10.100.100.11:0, label: 104
remote binding: lsr: 10.100.100.203:0, label: 209
remote binding: lsr: 10.100.100.138:0, label: 69
remote binding: lsr: 10.100.100.218:0, label: 53
remote binding: lsr: 10.100.100.136:0, label: 137
remote binding: lsr: 10.100.100.220:0, label: 292

PE1#sh tcp brief | in .646
4AB5D810 10.100.100.214.19522 10.100.100.1.646 SYNSENT
4AB3B7B0 10.100.100.214.48675 10.100.100.193.646 ESTAB
549735E4 10.100.100.214.646 10.100.100.218.15433 ESTAB
4AB46FC8 10.100.100.214.50658 10.100.100.11.646 ESTAB
4AB37B68 10.100.100.214.41165 10.100.100.14.646 ESTAB
4AD8D48C 10.100.100.214.21004 10.100.100.12.646 ESTAB
4ABB5E2C 10.100.100.214.22033 10.100.100.3.646 ESTAB
4ABB5838 10.100.100.214.44131 10.100.100.83.646 ESTAB
4AB469D4 10.100.100.214.37750 10.100.100.5.646 ESTAB
4AB4AFEC 10.100.100.214.19797 10.100.100.203.646 ESTAB
4AB3B030 10.100.100.214.32532 10.100.100.129.646 ESTAB
4AB40AD4 10.100.100.214.47057 10.100.100.132.646 ESTAB
4AB33C20 10.100.100.214.20654 10.100.100.75.646 ESTAB
54972FF0 10.100.100.214.60280 10.100.100.138.646 ESTAB
4AB2ED4C 10.100.100.214.35704 10.100.100.73.646 ESTAB
4AB5CBC0 10.100.100.214.56782 10.100.100.136.646 ESTAB
4AD8C604 10.100.100.214.34284 10.100.100.2.646 ESTAB
4AB41C80 10.100.100.214.25738 10.100.100.65.646 ESTAB
5496F6D0 10.100.100.214.646 10.100.100.220.25814 ESTAB

PE1#sh mls cef exception status
Current IPv4 FIB exception state = FALSE
Current IPv6 FIB exception state = FALSE
Current MPLS FIB exception state = FALSE

PE1#sh mpls ldp disc
Local LDP Identifier:
10.100.100.214:0
Discovery Sources:
Interfaces:
GigabitEthernet1/0/0 (ldp): xmit/recv
LDP Id: 10.100.100.1:0
Targeted Hellos:
10.100.100.214 -> 10.100.100.2 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.2:0
10.100.100.214 -> 10.100.100.3 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.3:0
10.100.100.214 -> 10.100.100.5 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.5:0
10.100.100.214 -> 10.100.100.8 (ldp): active, xmit

10.100.100.214 -> 10.100.100.11 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.11:0
10.100.100.214 -> 10.100.100.12 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.12:0
10.100.100.214 -> 10.100.100.14 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.14:0
10.100.100.214 -> 10.100.100.65 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.65:0
10.100.100.214 -> 10.100.100.73 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.73:0
10.100.100.214 -> 10.100.100.75 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.75:0
10.100.100.214 -> 10.100.100.83 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.83:0
10.100.100.214 -> 10.100.100.129 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.129:0
10.100.100.214 -> 10.100.100.132 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.132:0
10.100.100.214 -> 10.100.100.134 (ldp): active, xmit

10.100.100.214 -> 10.100.100.136 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.136:0
10.100.100.214 -> 10.100.100.138 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.138:0
10.100.100.214 -> 10.100.100.193 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.193:0
10.100.100.214 -> 10.100.100.203 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.203:0
10.100.100.214 -> 10.100.100.218 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.218:0
10.100.100.214 -> 10.100.100.220 (ldp): active/passive, xmit/recv
LDP Id: 10.100.100.220:0

Working PE to P example

PE2#ping 10.100.100.1 source loop0

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.100.100.1, timeout is 2 seconds:
Packet sent with a source address of 10.100.100.2
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms

PE2#sh ip route 10.100.100.1
Routing entry for 10.100.100.1/32
Known via "ospf 100", distance 110, metric 2, type intra area
Last update from 10.100.101.1 on TenGigabitEthernet1/0/0, 7w0d ago
Routing Descriptor Blocks:
* 10.100.101.1, from 10.100.100.1, 7w0d ago, via TenGigabitEthernet1/0/0
Route metric is 2, traffic share count is 1

PE2#sh mpls ldp bind 10.100.100.1 255.255.255.255
lib entry: 10.100.100.1/32, rev 4052
local binding: label: 3703
remote binding: lsr: 10.100.100.33:0, label: 26
remote binding: lsr: 10.100.100.20:0, label: 233
remote binding: lsr: 10.100.100.81:0, label: 283
remote binding: lsr: 10.100.100.24:0, label: 8373
remote binding: lsr: 10.100.100.193:0, label: 243
remote binding: lsr: 10.100.100.25:0, label: 4169
remote binding: lsr: 10.100.100.3:0, label: 381
remote binding: lsr: 10.100.100.79:0, label: 591
remote binding: lsr: 10.100.100.73:0, label: 226
remote binding: lsr: 10.100.100.14:0, label: 203
remote binding: lsr: 10.100.100.1:0, label: imp-null
remote binding: lsr: 10.100.100.11:0, label: 104
remote binding: lsr: 10.100.100.8:0, label: 72
remote binding: lsr: 10.100.100.12:0, label: 121
remote binding: lsr: 10.100.100.207:0, label: 276
remote binding: lsr: 10.100.100.5:0, label: 194
remote binding: lsr: 10.100.100.80:0, label: 392
remote binding: lsr: 10.100.100.129:0, label: 47
remote binding: lsr: 10.100.100.65:0, label: 1822
remote binding: lsr: 10.100.100.83:0, label: 562
remote binding: lsr: 10.100.100.203:0, label: 209
remote binding: lsr: 10.100.100.75:0, label: 525
remote binding: lsr: 10.100.100.19:0, label: 56
remote binding: lsr: 10.100.100.208:0, label: 375
remote binding: lsr: 10.100.100.209:0, label: 258
remote binding: lsr: 10.100.100.77:0, label: 1077
remote binding: lsr: 10.100.100.132:0, label: 245
remote binding: lsr: 10.100.100.214:0, label: 262
remote binding: lsr: 10.100.100.136:0, label: 137
remote binding: lsr: 10.100.100.138:0, label: 69
remote binding: lsr: 10.100.100.220:0, label: 292
remote binding: lsr: 10.100.100.218:0, label: 53

PE2#sh tcp brief | in .646
570BFF30 10.100.100.2.646 10.100.100.20.51011 ESTAB
571A72A8 10.100.100.2.646 10.100.100.11.32692 ESTAB
4A63C448 10.100.100.2.646 10.100.100.12.31796 ESTAB
4A63DEE0 10.100.100.2.646 10.100.100.129.62011 ESTAB
4A3CBB44 10.100.100.2.646 10.100.100.214.34284 ESTAB
56B205A8 10.100.100.2.646 10.100.100.79.48998 ESTAB
49AEEF18 10.100.100.2.646 10.100.100.25.40732 ESTAB
56E319D0 10.100.100.2.646 10.100.100.81.48384 ESTAB
56ED0B8C 10.100.100.2.646 10.100.100.220.17975 ESTAB
56B1234C 10.100.100.2.646 10.100.100.65.33556 ESTAB
5720FE8C 10.100.100.2.646 10.100.100.8.24703 ESTAB
46788578 10.100.100.2.646 10.100.100.14.58600 ESTAB
49C0E21C 10.100.100.2.43822 10.100.100.1.646 ESTAB
5658D384 10.100.100.2.646 10.100.100.138.65214 ESTAB
4AA33938 10.100.100.2.646 10.100.100.80.29038 ESTAB
56B47D68 10.100.100.2.646 10.100.100.75.26130 ESTAB
4A8A0DC4 10.100.100.2.646 10.100.100.136.48260 ESTAB
4A8466BC 10.100.100.2.646 10.100.100.33.58395 ESTAB
4A91565C 10.100.100.2.646 10.100.100.208.56612 ESTAB
4A5488C0 10.100.100.2.646 10.100.100.132.12259 ESTAB
4AA9A9C4 10.100.100.2.646 10.100.100.209.16326 ESTAB
4A8E3738 10.100.100.2.646 10.100.100.3.42991 ESTAB
4AA15A2C 10.100.100.2.60646 10.100.111.224.49 TIMEWAIT
571CAE70 10.100.100.2.646 10.100.100.19.57659 ESTAB
4A6DDA48 10.100.100.2.646 10.100.100.83.14511 ESTAB
4A73AE68 10.100.100.2.646 10.100.100.207.38249 ESTAB
4A43536C 10.100.100.2.646 10.100.100.193.21168 ESTAB
4A883850 10.100.100.2.646 10.100.100.24.27521 ESTAB
56F58F28 10.100.100.2.646 10.100.100.5.53889 ESTAB
573015E0 10.100.100.2.646 10.100.100.73.57339 ESTAB
4AB15038 10.100.100.2.646 10.100.100.77.12405 ESTAB
4A3F4908 10.100.100.2.646 10.100.100.218.26383 ESTAB
56E77794 10.100.100.2.646 10.100.100.203.61840 ESTAB

PE1#sh mls cef exception ?
priorities recovery priorities
status ERM status

NAS_CEN_PE2#sh mls cef exception status
Current IPv4 FIB exception state = FALSE
Current IPv6 FIB exception state = FALSE
Current MPLS FIB exception state = FALSE

Akash Agrawal · ‎10-14-2015

Hi,

LDP is not coming up due to password mismatch. On PE1 you have configured ctB$1pM while on core it is ctB$1PM. Please correct password on either side and check if LDP comes up.

From below logs it is clear that both routers are able to transmit/receive each other's LDP hello. It should be related to password only.

PE1#sh mpls ldp disc

Local LDP Identifier:

10.100.100.214:0

Discovery Sources:

Interfaces:

GigabitEthernet1/0/0 (ldp): xmit/recv

LDP Id: 10.100.100.1:0

P1#sh mpls ldp discov

Local LDP Identifier: 10.100.100.1:0
Discovery Sources:
Interfaces:

GigabitEthernet0/10/0/2 : xmit/recv

LDP Id: 10.100.100.214:0, Transport address: 10.100.100.214
Hold time: 15 sec (local:15 sec, peer:15 sec)

antione-smith · ‎10-14-2015

Hi Akash,

Thank you so much!!

Nail on the head, 100% success immediately.

PE1(config)#mpls ldp neighbor 10.100.100.1 password ctB$1PM

PE1#sh mpls ldp neigh 10.100.100.1
Peer LDP Ident: 10.100.100.1:0; Local LDP Ident 10.100.100.214:0
TCP connection: 10.100.100.1.646 - 10.100.100.214.23460
State: Oper; Msgs sent/rcvd: 173/173; Downstream
Up time: 00:00:12
LDP discovery sources:
GigabitEthernet1/0/0, Src IP addr: 10.100.104.181
Addresses bound to peer LDP Ident:
10.100.100.1 10.100.101.90 10.100.101.37 10.100.101.17
10.100.101.1 10.100.101.45 10.100.101.41 10.100.101.21
10.100.104.181 10.100.105.2

PE1#ping vrf SONUS 10.120.4.1 repeat 2

Type escape sequence to abort.
Sending 2, 100-byte ICMP Echos to 10.120.4.1, timeout is 2 seconds:
!!
Success rate is 100 percent (2/2), round-trip min/avg/max = 8/8/8 ms

PE1#sh mpls forw 10.120.4.1
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or VC or Tunnel Id Switched interface

PE1#sh ip cef vrf SONUS 10.120.4.1
10.120.4.0/27
nexthop 10.100.104.181 GigabitEthernet1/0/0 label 16000 1809

PE1#trace mpls ipv4 10.100.100.1 255.255.255.255
Tracing MPLS Label Switched Path to 10.100.100.1/32, timeout is 2 seconds

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,
'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.
0 10.100.104.182 MRU 9180 [Labels: implicit-null Exp: 0]

Good talent and thanks again man... I owe you a few beers anytime :-)

Help - core LSP broken - unusable: no label