Hi
Is anybody aware of a particular bug in the S train relating to this or
maybe a specific order of operations that should be carried out to
ensure these sessions come up successfully every time?
I have had a mixed bag of problems but mostly I end up with 'LDP Id:
80.0.100.8:0; no host route to transport addr' or similar, when all the
configuration is interface based with the correct transport addresses
defined. Whenever I have this issue and remove the per-neighbour
password config the problem goes away and the session comes up.
The logging is mostly:
00:01:57: %TCP-6-BADAUTH: No MD5 digest from 80.0.100.8(22874) to
80.0.100.6(646)
And once the password config is removed:
00:03:02: %LDP-5-NBRCHG: LDP Neighbor (vrf SP1000) 60.60.60.60:0 (3) is
UP
R8(config)#do sh mpls ldp disc vrf SP1000
Local LDP Identifier:
80.0.100.8:0
Discovery Sources:
Interfaces:
FastEthernet0/0.806 (ldp): xmit/recv
LDP Id: 60.60.60.60:0; IP addr: 80.0.100.6; no host route
<- This session is actually up
Does anybody know exactly what LDP is trying do when it 'looks up the
remote transport address'? Is it something other than a unicast RIB
lookup?
Here is some example config from SP labs/Section05 (R6-R8):
R8 ------------------------->
R8(config-subif)#do sh run int FastEthernet0/0.806
Building configuration...
Current configuration : 184 bytes
!
interface FastEthernet0/0.806
encapsulation dot1Q 806
ip vrf forwarding SP1000
ip address 80.0.100.8 255.255.255.240
mpls ldp discovery transport-address interface
mpls ip
end
R8(config-subif)#do sh mpls ldp disc vrf SP1000 det
Local LDP Identifier:
80.0.100.8:0
Discovery Sources:
Interfaces:
FastEthernet0/0.806 (ldp): xmit/recv
Enabled: Interface config
Hello interval: 5000 ms; Transport IP addr: 80.0.100.8
LDP Id: 60.60.60.60:0; no host route to transport addr
Src IP addr: 80.0.100.6; Transport IP addr: 80.0.100.6
Hold time: 15 sec; Proposed local/peer: 15/15 sec
Reachable via 80.0.100.0/28
Password: not required, none, in use
R8(config-subif)#do sh run | i SP1000 80.0.100.6 pass
mpls ldp neighbor vrf SP1000 80.0.100.6 password ipexpert
R6 ------------------------->
R6(config-subif)#do sh run int f0/0.806
Building configuration...
Current configuration : 158 bytes
!
interface FastEthernet0/0.806
encapsulation dot1Q 806
ip address 80.0.100.6 255.255.255.240
mpls ldp discovery transport-address interface
mpls ip
end
R6(config-subif)#do sh mpls ldp disc det
Local LDP Identifier:
60.60.60.60:0
Discovery Sources:
Interfaces:
FastEthernet0/0.806 (ldp): xmit/recv
Enabled: Interface config
Hello interval: 5000 ms; Transport IP addr: 80.0.100.6
LDP Id: 80.0.100.8:0; no host route to transport addr
Src IP addr: 80.0.100.8; Transport IP addr: 80.0.100.8
Hold time: 15 sec; Proposed local/peer: 15/15 sec
Reachable via 80.0.100.0/28
Password: not required, neighbor, in use
R6(config-subif)#do sh run | i 80.0.100.8 pass
mpls ldp neighbor 80.0.100.8 password ipexpert
--Dan Holme
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