System information

Troubleshooting AppleTalk
Book Title
9-206
If the Enhanced IGRP router loses the connection to a network, it becomes active for that network.
The router sends out queries to all its neighbors in order to find a new route to the network. The router
remains in Active mode until it has either received replies from all its neighbors or until the active
timer, which determines the maximum period of time a router will stay active, has expired.
If the router receives a reply from each of its neighbors, it computes the new next hop to the network
and becomes passive for that network. However, if the active timer expires, the router removes from
its neighbor table any neighbors that did not reply, again enters Active mode, and issues a
“Stuck-in-Active” message to the console.
AURP: Routes Not Propagated Through AURP Tunnel
Symptom: AppleTalk routes are not propagated through an AURP tunnel. Routes that are known to
exist on one side of the tunnel do not appear in the routing tables of the exterior router on the other
side of the tunnel. Changes on the remote network (such as a route going down) are not learned by
the exterior router on the other side of the tunnel.
Table 9-16 outlines the problems that might cause this symptom and describes solutions to those
problems.
Table 9-16 AURP: Routes Not Propagated Through AURP Tunnel
FDDITalk: No Zone Associated with Routes
Symptom: Routers on an FDDI ring have routes to networks across the ring, but no zones are
associated with the routes. The output of the show appletalk routecommand indicates “no zone set”
for those routes.
Possible Problems Solution
Misconfigured
AURP tunnel
Step 1 Use the show appletalk interfaces exec command to make sure the tunnel
interface is up.
Step 2 Use the show running-config privileged exec command to view the router
configuration. Check the tunnel source and tunnel destination interface
configuration command entries.
Step 3 Exterior routers must have their tunnel interface configured with a tunnel
source and a tunnel destination command. Make sure that the tunnel
destination command on each router points to the IP address of the remote
exterior router’s tunnel interface.
Missing appletalk
route-redistribution
command
Step 1 If changes on the remote network are not learned through the tunnel, use
the show running-config privileged exec command to view the router
configuration. Check for an appletalk route-redistribution global
configuration command entry.
Step 2 If the command is not present, add it to the configuration.
Problem with underlying
IP network
If there are routing problems in the transit network (the IP network through which
the AURP tunnel passes), then AppleTalk traffic might have difficulty traversing the
tunnel.
To troubleshoot your TCP/IP network, follow the procedures outlined in Chapter 7,
“Troubleshooting TCP/IP.”