[HECnet] Cisco DECnet Routing

[Tim Sneddon]

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.
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