System information

Troubleshooting AppleTalk 9-203
AppleTalk Enhanced IGRP: Routes Missing from Routing Table
AppleTalk Enhanced IGRP: Routes Missing from Routing Table
Symptom: Routes are missing from the routing table of routers running AppleTalk Enhanced IGRP.
Clients (Macintosh computers) on one network cannot access servers on a different network. Clients
might or might not be able to connect to servers on the same network. The problem might occur in
internetworks running only Enhanced IGRP or in an internetwork running Enhanced IGRP and
RTMP.
Table 9-13 outlines the problems that might cause this symptom and describes solutions to those
problems.
Table 9-13 AppleTalk Enhanced IGRP: Routes Missing from Routing Table
Timer values are mismatched
Step 1 Use the show appletalk eigrp neighbors exec command. Make sure
that all directly connected AppleTalk Enhanced IGRP routers appear
in the output.
Step 2 Examine the uptime field in the show appletalk eigrp neighbors
output. A continuously resetting uptime counter indicates that hello
packets from the neighboring router are arriving sporadically. This
might be caused by a timer value mismatch or by hardware problems.
Step 3 Use the show interface exec command to determine whether the
interface and line protocol are up. Look for high numbers in the queue
fields and excessive drop counts. The queue fields displays the
maximum size of the queue and the number of packets dropped due to
a full queue.
If there are many drops, if the queue count is high, or if the interface or
line protocol is down, there is probably something wrong with the
interface or other hardware. For more information on troubleshooting
hardware, see Chapter 3,“Troubleshooting Hardware and Booting
Problems,” and Chapter 15, “Troubleshooting Serial Line Problems.”
Step 4 Use the show running-config privileged exec command on all
AppleTalk Enhanced IGRP routers in the network. Look for appletalk
eigrp-timers interface configuration command entries. The values
configured by this command must be the same for all AppleTalk
Enhanced IGRP routers on the network.
Step 5 If any routers have conflicting timer values, reconfigure them to
conform with the rest of the routers on the network. These values can
be returned to their defaults with the no appletalk eigrp-timers
interface configuration command.
Older version of the
Cisco IOS software
If problems persist, upgrade to the latest release of the Cisco IOS software.
Possible Problem Solution
Routers not establishing
neighbors properly
For information on troubleshooting this problem, see the section “AppleTalk
Enhanced IGRP: Routers Not Establishing Neighbors” earlier in this chapter.
AppleTalk Enhanced
IGRP is not enabled on
interfaces
Use the show running-config privileged exec command on routers that are running
Enhanced IGRP. Check the interface configurations for appletalk protocol eigrp
interface configuration command entries.
This command must be present in order for an interface to generate AppleTalk
Enhanced IGRP hello messages and routing updates.
Possible Problem Solution