Pengo Computer Accessories UBR7200 manual Show radio flap-list, Flapped, Sort-time, 149

Multipoint Wireless Support for the Cisco uBR7200 Series Universal Broadband Router

show radio flap-list

show radio flap-list

Syntax Description

Defaults

Command Modes

Command History

Usage Guidelines

To display the radio flap-list of a wireless modem card, use the show radio flap-listEXEC command.

show radio flap-list [sort-flap sort-time]

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.

No default behavior or values.

EXEC

ReleaseModification

12.1(3)XQ1 This command was introduced.

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

Cisco IOS Release 12.1(5)XM

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