Minimum Delay for Wireless Network

[prashanma]

Hi Team,

What is the minimum delay for Wireless network ? (Between Wireless user and WLC) 

Is it less than 1ms ?

BR

[Joseph W. Doherty]

What you want to see in not much deviation from the minimal value.

[rasmus.elmholt]

It is all relative. I think the recommendation is below 300ms, but I have SAT links with 600ms RTT witch still works.
As long as the RTT is constant it means there is no congestion and the links are stable.

[prashanma]

Thank you Rasmus, 

So in my scenario it less than 4ms. So capwap seems ok. 

We did the Band 2.4 to 5 in some wireless user, when we do that delay to specification suddenly get reduced

Also I did some icmp testing from wireless user, I noticed that there are some request time-out. What can be cause the issue now ? Internet link and MPLS link usage are normal.

Any Cisco Tools for check the Wireless interference ?

[Joseph W. Doherty]

"We did the Band 2.4 to 5 in some wireless user, when we do that delay to specification suddenly get reduced"

That's often because the 5 gig bands are often less utilized - there's also more channels too.

"Also I did some icmp testing from wireless user, I noticed that there are some request time-out. What can be cause the issue now ? Internet link and MPLS link usage are normal."

I.e. ping testing? If so, depending on what you're pinging, like a Cisco device, device at that moment just too busy to reply. Lost pings aren't always indicative of a network issue.

"Any Cisco Tools for check the Wireless interference ?"

That's a question probably better asked in the Wireless forums.

[rasmus.elmholt]

You need to take a look at you RF environment. Use the Cleanair functionality on the controller.
As Joseph says the things you see with ping jumping all over the place is most likely caused by heavy utilisation of the 2,4 RF spectrum. Both by you users or interference.
Cisco got a tool called Wireless Lan Config Analyzer (WLCCA) I have used once or twice to summarise and generate a report of your wireless health.