I have a dozen of ASR's and having LDP problem between two of them: one ASR1006 and one ASR1001 over an inter-metro WAN. The LDP session is broken every now and then, even though the OSPF between them has no adjacency issues. All other LDP sessions between the adjacent routers are working fine.
Here is the LDP discovery details when the session is down. Both are transmitting hellos but neither are receiving. What are the possible causes of this? How to troubleshoot? We initially thought of the IOS issue, but have upgraded from 15.1(2)S1 to 152-2.S without resolving the problem.
sh mpls ldp discovery d Local LDP Identifier: 172.16.33.1:0 Discovery Sources: Interfaces: GigabitEthernet0/0/0 (ldp): xmit/recv Enabled: Interface config Hello interval: 5000 ms; Transport IP addr: 172.16.33.1 LDP Id: 172.16.33.2:0 Src IP addr: 172.16.32.2; Transport IP addr: 172.16.33.2 Hold time: 15 sec; Proposed local/peer: 15/15 sec Reachable via 172.16.33.2/32 Password: not required, none, in use Clients: IPv4 GigabitEthernet0/0/7.1 (ldp): xmit <---------------problem session Enabled: Interface config Hello interval: 5000 ms; Transport IP addr: 172.16.33.1 Clients: IPv4 GigabitEthernet0/0/7.2 (ldp): xmit/recv Enabled: Interface config Hello interval: 5000 ms; Transport IP addr: 172.16.33.1 LDP Id: 172.16.33.10:0 Src IP addr: 172.16.32.37; Transport IP addr: 172.16.33.10 Hold time: 15 sec; Proposed local/peer: 15/15 sec Reachable via 172.16.33.10/32 Password: not required, none, in use Clients: IPv4
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