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Multipoint Wireless Support for the Cisco uBR7200 Series Universal Broadband Router
show radio flap-list
149
Cisco IOS Release 12.1(5)XM
show radio flap-list
To display the radio flap-list of a wireless modem card, use the show radio flap-list EXEC command.
show radio flap-list [sort-flap | sort-time]
Syntax Description
Defaults No default behavior or values.
Command Modes EXEC
Command History
Usage Guidelines The Cisco uBR7200 series universal broadband routers maintain a database of flapping radio subscriber
to assist in locating problems. The flapping radio modem detector tracks the upstream and downstream
performance of all radio modems on the network, without impacting throughput and performance or
creating additional packet overhead on the network. The radio modem flap list keeps track of the radio
modem MAC address, up and down transitions, registration events, missed periodic ranging packets,
upstream power adjustments, and the physical interface on the Cisco uBR7200 series.
The flap list collects the following station maintenance statistics:
• Detects interface up/down flap; the reinsertion counter counts the number of times a radio modem
comes up and inserts into the network. This helps identify potential problems in the downstream,
because improperly provisioned radio modems tend to try to reestablish a link repeatedly.
• Detects intermittent upstream; the keepalive hits versus misses is the number of times radio
modems do not respond or do not respond to the MAC layer keepalive messages. A number of
misses indicates a potential problem in the upstream.
• Lists radio modem MAC addresses sorted by flap rate or most recent flap time.
Use the following suggestions for interpreting different network conditions based on the flap-list
statistics:
• Condition 1: Low miss/hit ratio, low insertion, low flap counter, and old timestamp.
Analysis: This exhibits an optimal network situation.
• Condition 2: High ratio of misses over hits (> 10%)
Analysis: Hit/miss analysis should be done after the Ins count stops incrementing. In general, if
the hit and miss counts are about the same order of magnitude, then the upstream may be
experiencing noise. If the miss count is greater, then the modem is probably dropping out frequently
sort-flap A sorting option that specifies the number of times the radio modem had
flapped.
sort-time A sorting option that specifies the most recent flapping activity.
Release Modification
12.1(3)XQ1 This command was introduced.