topic CAPWAP timers in Wireless

CAPWAP timers

janesh_abey — Sun, 04 Jul 2021 04:04:07 GMT

Hi all,

We are looking at options in the design stage to increase the AP timers so that HREAP APs will not go standalone due to bad WAN links.

One possible way to achieve this is to disable heartbeat which is is the default setting.

The other option that I could see to acheive this is by tuning CAPWAP timers.

Not too sure whether tuning CAPWAP timers is the best approach.

Having said that, Table 8-17 of Cisco WLC config guide pg 505 implies that we could adjust CAPWAP timers.

However I cannot see this option under the AP advanced tab on the WLC. WLC is running 7.0.98.

Any advice is much appreciated.

cheers,

janesh

CAPWAP timers

Scott Fella — Mon, 14 Nov 2011 00:46:56 GMT

You can adjust some timers, but from the CLI:

http://www.cisco.com/en/US/products/ps6366/products_tech_note09186a00809a3f5d.shtml#backinfo

Re: CAPWAP timers

janesh_abey — Mon, 14 Nov 2011 04:48:27 GMT

Hi Scott,

Thanks for taking time to reply.The link only provides details on fast-ap-configuration timers.

My query was in relation to CAPWAP timers.

On the same topic, HREAP deployment guide states that "Roundtrip latency must not exceed 300 milliseconds (ms) for data and 100 ms for voice and data between the access point and the controller"

The doco (hreap deployment guide, Cisco WLC 7.0 config guide and networkers slides) does not indicate what are the consequences if we exceed the recommended RTT values.Put it differently whats the exact impact on data and voice?

Also what is the consequence of disabling hearbeat for H-REAP WAP? If the WAN link fails I beleive the CAPWAP timers come into play to enforce standalone mode of operation.

Thanks,

Janesh

Re: CAPWAP timers

Scott Fella — Mon, 14 Nov 2011 07:03:16 GMT

Well basically if your latency is greater than the requirement, there is no guarantee it will work. You can't guarantee voice calls at all and for data, you also risk AP's going to stand alone mode. You might want to deploy those AP's in autonomous mode if you have issues with the AP join. This will not help though if you are running voice. Like the guide mentions, you would have to priorities the capwap traffic.

Here is a doc on lwapp traffic study

http://www.cisco.com/en/US/tech/tk722/tk809/technologies_white_paper09186a0080901caa.shtml

Sent from my iPhone

Re: CAPWAP timers

janesh_abey — Mon, 14 Nov 2011 20:42:19 GMT

Hi Scott,

Many thanks for the reply.That is exactly waht I was after.

cheers,

Janesh