04-14-2012 03:06 AM
I have an LDP session configured over my P2P interface and it is not coming up . What can be the reason ? I can ping the P2P IP adddress
*************************
interface FastEthernet4/1
ip address 10.10.0.46 255.255.255.252
ip ospf network non-broadcast
ip ospf cost 10
mpls ip
Router #sh mpls ldp neighbor
*****************************************
interface GigabitEthernet3/4.1254
encapsulation dot1Q 1254
ip address 10.10.0.45 255.255.255.252
ip ospf network non-broadcast
ip ospf cost 10
mpls ip
Regards
Haris P
04-14-2012 03:15 AM
Hi Haris,
what do you have in
sh mpls ldp disc
?
04-14-2012 03:50 AM
Router2#sh mpls ldp discovery
Local LDP Identifier:
172.16.12.6:0
Discovery Sources:
Interfaces:
GigabitEthernet3/4.326 (ldp): xmit
Router1#sh mpls ldp discovery
Local LDP Identifier:
172.16.22.137:0
Discovery Sources:
Interfaces:
FastEthernet4/1 (ldp): xmit
04-14-2012 04:08 AM
Hi Haris,
thanks, I guess these IPs - 172.16.12.6 and 172.16.22.137 are assigned to the loopback interfaces? do you advertise 'em in OSPF, i.e can R1 reach 172.16.12.6 and vice versa?
you can also enable these debugs, assuming you're in a lab that'll not cause any issues:
debug mpls ldp messages received all
debug mpls ldp messages sent all
HTH,
Ivan.
04-14-2012 05:05 AM
Yes ,IP's 172.16.12.6 and 172.16.22.137 are for loopbacks and im advertising
this thru OSPF and ping each other loopback IP's (also from lookpack to
loopback ip by specifying source IP)
During the below debug , I saw some messages going to some other neighbors
but not to the one we want . The message are going to loopback while in my
case the P2P ldp session itself not coming up
debug mpls ldp messages received all
0 messages
debug mpls ldp messages sent all
0 messages
04-14-2012 05:38 AM
Harris,
Issue show mpls ldp
Craig
04-14-2012 05:58 AM
Router1#sh mpls interfaces
nterface IP Tunnel Operational
FastEthernet4/1 Yes (ldp) No Yes
Router1#sh mpls ldp bindings
tib entry: 0.0.0.0/0, rev 1106706
local binding: tag: imp-null
tib entry: 10.10.10.0/30, rev 62
local binding: tag: imp-null
tib entry: 10.10.10.4/30, rev 64
local binding: tag: imp-null
tib entry: 10.10.10.12/30, rev 60
Router1#sh mpls ldp parameters
Protocol version: 1
Downstream label generic region: min label: 16; max label: 100000
Session hold time: 180 sec; keep alive interval: 60 sec
Discovery hello: holdtime: 15 sec; interval: 5 sec
Discovery targeted hello: holdtime: 90 sec; interval: 10 sec
Downstream on Demand max hop count: 255
LDP for targeted sessions
LDP initial/maximum backoff: 15/120 sec
LDP loop detection: off
Rouetr2#sh mpls ldp parameters
Protocol version: 1
Session hold time: 180 sec; keep alive interval: 60 sec
Discovery hello: holdtime: 15 sec; interval: 5 sec
Discovery targeted hello: holdtime: 90 sec; interval: 10 sec
Downstream on Demand max hop count: 255
LDP for targeted sessions
LDP initial/maximum backoff: 15/120 sec
LDP loop detection: off
04-14-2012 06:10 AM
Haris,
what is in between, some sort of a switch I guess? is that capable of multicast forwarding, for example can you ping 224.0.0.2 from both routers?
please issue 'sh ip int' for respective interfaces.
04-14-2012 06:25 AM
Router1#ping 224.0.0.2
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 224.0.0.2, timeout is 2 seconds:
Reply to request 0 from 10.10.0.45, 16 ms
On the Router 2 ,im not receiving any reply for this host (it is configured as ospf network non-broadcast )whether this will effect >?
Router2#ping 224.0.0.2
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 224.0.0.2, timeout is 2 seconds:
Router2#sh mpls ldp discovery
Local LDP Identifier:
172.16.12.6:0
Discovery Sources:
Interfaces:
GigabitEthernet3/4.326 (ldp): xmit
Router1#sh mpls ldp discovery
Local LDP Identifier:
172.16.22.137:0
Discovery Sources:
Interfaces:
FastEthernet4/1 (ldp): xmit
interface FastEthernet4/1
ip address 10.10.0.46 255.255.255.252
ip ospf network non-broadcast
ip ospf cost 10
mpls ip
*****************************************
interface GigabitEthernet3/4.1254
encapsulation dot1Q 1254
ip address 10.10.0.45 255.255.255.252
ip ospf network non-broadcast
ip ospf cost 10
mpls ip
04-14-2012 06:41 AM
In between it is a telco network , OSPF is coming up
I just remove the " ip ospf network non-broadcast " and removed the static neighbor statements and i was able to establish the ospf neighbor relationship
Regards
09-24-2014 02:39 AM
Hi
I had same issue and i did remove ospf command from interface.
I did reverify all other neighbor router ospf and interface ip.
I did check mpls ip on all the interface connected on this route, but no luck.
in sh mpls ldp disc all it was showing xmit. but unable to get exact issue.
all loopback ip were advertised to ospf.
Resetted ospf but no luck.
So decided to reboot router, and it does work.
Prior to reboot, below output I was getting.
R3#
*Sep 24 14:46:12.087: %LDP-5-CLEAR_NBRS: Clear LDP neighbors (*) by console
R3#sh mpls ldp discovery all
Local LDP Identifier:
53.0.0.1:0
Discovery Sources:
Interfaces:
FastEthernet0/0 (ldp): xmit
FastEthernet0/1 (ldp): xmit
R3#sh mpl ld nei
R3#sh mpl ld nei
After reboot I could see mpls neighbors.
04-14-2012 07:10 AM
Harris,
In your setup can you add mpls ldp router-id Loopback force
Also, do you have mpls label protocol ldp
Craig
04-14-2012 07:31 AM
Yes , I enter this manually on router
mpls label protocol ldp
no mpls ip propagate-ttl
mpls ldp router-id Loopback1
interface Loopback1
ip address 172.16.22.137 255.255.255.255
end
04-14-2012 07:45 AM
Harris,
Would you reconfigure the mpls ldp router-id X.X.X.X with a /32 network
mask
Craig
04-14-2012 07:46 AM
Harris,
Would you reconfigure the mpls ldp router-id to X.X.X.X with a /32 network mask
Craig
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