15 Feb
2019
15 Feb
'19
5:27 a.m.
Hi everyone,
I've some across a bit of a problem and was hoping that someone else here
has either experienced it or is able to have a clue as to what is going on.
I run a Cisco 1841 (a12rtr) here which is my link to the HECnet. This is
established with three GRE tunnels to area 22, 61 and 42. This router is
inside a network that is edged with a Cisco ASA (gatekeeper). The router
a12rtr also has other GRE tunnels and 6in4 tunnels.
All tunnels are established and traffic is flowing over the ipv4 and ipv6
tunnels without issue. There is also traffic flowing over the DECnet
tunnels as well. However...
Despite having adjacencies for the three DECnet routers on the other end of
the DECnet tunnels, my routing table is not filling up.
Area Cost Hops Next Hop to Node Expires Prio
*12 0 0 (Local) -> A12RTR
Node Cost Hops Next Hop to Node Expires Prio
*(Area) 0 0 (Local) -> A12RTR
*BENDER 10 1 FastEthernet0/1 -> BENDER 60
*TRON 10 1 FastEthernet0/1 -> TRON 99
*ELYSIM 10 1 FastEthernet0/1 -> ELYSIM 1525
*A12RTR 0 0 (Local) -> A12RTR
a12rtr#show decnet neighbors
Net Node Interface MAC address Flags
0 22.1023 Tunnel58 0000.0000.0000 A
0 42.1022 Tunnel51 0000.0000.0000 A
0 61.1023 Tunnel53 0000.0000.0000 A
0 12.2 FastEthernet0/1 aa00.0400.0230
0 12.3 FastEthernet0/1 aa00.0400.0330
0 12.12 FastEthernet0/1 aa00.0400.0c30
I can also see that the routers are communicating when I switch on debug:
*Feb 15 04:19:37.007: DNET-ADJ: Endnode hello from 12.3
*Feb 15 04:19:39.835: DNET-ADJ: Level 2 hello from 42.1022
*Feb 15 04:19:39.835: DNET-ADJ: Level 2 (IV+) hello from 42.1022
*Feb 15 04:19:43.207: DNET-ADJ: Endnode hello from 12.2
*Feb 15 04:19:45.211: DNET-ADJ: Level 2 hello from 61.1023
*Feb 15 04:19:45.211: DNET-ADJ: Level 2 (IV+) hello from 61.1023
*Feb 15 04:19:46.315: DNET-ADJ: Level 2 hello from 22.1023
*Feb 15 04:19:46.315: DNET-ADJ: Level 2 (IV+) hello from 22.1023
So, I am a bit confused as to why there is no routing being exchanged. Is
this just a bug and I need to give the router a reboot (it has only been up
for 6 days).?
I did notice this:
a12rtr#show decnet database
Area/Node Cost Hops Next Hop to Node Status
12 0 0 (Local) -> A12RTR Active
22 20 1 Tunnel58 -> 22.1023 Backup
42 20 1 Tunnel51 -> 42.1022 Backup
61 20 1 Tunnel53 -> 61.1023 Backup
BENDER 10 1 FastEthernet0/1 -> BENDER Active
TRON 10 1 FastEthernet0/1 -> TRON Active
ELYSIM 10 1 FastEthernet0/1 -> ELYSIM Active
A12RTR 0 0 (Local) -> A12RTR Active
The tunnels are all listed as "backup". I've tried a lot of different
things and I'm still experimenting, but I still don't have an answer.
Despite a very long time working with this stuff I've never encountered a
situation where the routing table did not populate.
Any thoughts would be greatly appreciated :-)
Regards, Tim.