Information Technology Reference
In-Depth Information
Table9-4
AppleTalk: Zones Missing from Chooser (continued)
Possible Problems
Solution
Route flapping
(unstable route)
The load field displayed in the
show interfaces
command is the
load on the interface as a fraction of 255 (255/255 is completely
saturated), calculated as an exponential average over five
minutes.
2.
If the load is less than 50%, reconfiguring timer values
might solve the problem by allowing RTMP updates more
time to propagate through the network.
If the load is more than 50%, you might need to segment the
network to reduce the number of routers (and therefore the
amount of traffic) on each network segment.
Use the
debug apple events privileged exec
command to
determine whether routes are being aged incorrectly. The
output should resemble the following:
3.
Router#
debug apple events
AppleTalk Events debugging is on
Router#
%AT-6-PATHNOTIFY: Ethernet0: AppleTalk RTMP path to
250-250 down; reported bad by 200.41
Caution:
Because debugging output is assigned high priority in
the CPU process, it can render the system unusable. For this
reason, use
debug
commands only to troubleshoot specific
problems or during troubleshooting sessions with Cisco
technical support staff. Moreover, it is best to use
debug
commands during periods of lower network traffic and fewer
users. Debugging during these periods decreases the likelihood
that increased
debug
command processing overhead will affect
system use.
4.
If routes are being aged incorrectly, use the
appletalk timers
global configuration command to correct
the problem. Suggested timer values are 10, 30, and 90 to
start, but do not exceed 10, 40, and 120. The first number
must always be 10, and the third value should be three times
the second.
You can return the timers to their defaults (10, 20, 60) by using
the
no appletalk timers
global configuration command.
Timers should be consistently set to the same value throughout
the internetwork, or at a minimum, throughout the backbone of
the internetwork.
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