topic Re: Capwap mtu 1005 in Wireless

Capwap mtu 1005

Sanju_13 — Sun, 24 Mar 2024 12:37:31 GMT

Hi team,

In my environment, I've noticed an anomaly with our 500 APs. Around 450 of them are establishing CAPWAP tunnels with 1485 MTU, while the remaining 50 are using 1005 MTU.

AP Model: 9166 {All APs are in local mode}

WLC: 9800

is it any bug or configuration issue.

Thanks in advance

Re: Capwap mtu 1005

Mark Elsen — Wed, 20 Mar 2024 07:06:03 GMT

- I can't see any MTU differences in your screenshot ,

Re: Capwap mtu 1005

Sanju_13 — Sun, 24 Mar 2024 12:37:52 GMT

Hi marce,

Above the output of 'show capwap detailed | e 1485 ".

"show capwap detailed" command output attached below.

Re: Capwap mtu 1005

Mark Elsen — Wed, 20 Mar 2024 07:43:53 GMT

- In that screenshot I only see 1485 as MTU ,

Re: Capwap mtu 1005

balaji.bandi — Wed, 20 Mar 2024 07:54:55 GMT

Not sure you may be hitting with Bug : ( what Code running your WLC ?)

https://bst.cisco.com/bugsearch/bug/CSCwf52815

Re: Capwap mtu 1005

Sanju_13 — Wed, 20 Mar 2024 11:29:44 GMT

We are using 17.9.4

Re: Capwap mtu 1005

balaji.bandi — Wed, 20 Mar 2024 21:57:14 GMT

we are running 17.9.4a i dont see any issue, worth open a TAC case.

Re: Capwap mtu 1005

MHM Cisco World — Wed, 20 Mar 2024 22:26:32 GMT

If these AP in site run IPSec over tunnel or over MPLS and there are multi label then ot can mtu reduce to this value.

This vlaue is nego between WLC and AP

And both agree in one value.

I dont think it bug.

Dont worry of the capwap is health

MHM