Step 1 Use the show appletalk traffic command to check the field showing the number of ZIP requests:
Compare this output with the output shown by the command 30 seconds later.
Step 2 If the traffic counters for ZIP requests are incrementing very rapidly (by more than 10 every 30 seconds) a ZIP storm is probably occurring.
Use the debug apple zip privileged exec command to identify the network for which the zone is being requested by neighboring routers. You can also use the show apple private exec command to check the number of pending ZIP requests.
Step 3 Identify the router that injected the network number into the internetwork (and that is causing the excessive ZIP traffic). The show appletalk traffic and show appletalk route exec commands provide information that can help you find the suspect router.
For example, you can use the show appletalk route exec command to view the AppleTalk routing table. Check whether a network shows up in the routing table, even though the display indicates that no zone is set.
If you find a network for which no zone is set, a node on that network is probably not responding to ZIP requests, resulting in the ZIP storm.
Step 4 Determine why the node is not responding to ZIP requests. Access lists or other filters might be the cause.
ZIP storms can also result from a defect in the software running on the node. Contact the vendor to determine whether there is a known problem.
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