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Frequent Contributor II
Posts: 110
Registered: ‎07-24-2014

Too many undersized/giant packets on port warning

I have AP-275's connected to HP switches. On most of these ports, I get the error:

 

Too many undersized/giant packets on port #

 

And the message details indicates it may be a malfunctioning NIC.

 

Is this a setting - MTU or something? All of the (thousands of) errors are giants.

Frequent Contributor II
Posts: 110
Registered: ‎07-24-2014

Re: Too many undersized/giant packets on port warning

I tried the

 

 jumbo max-frame-size 2048

 

config command and will keep an eye on the error count

Frequent Contributor II
Posts: 110
Registered: ‎07-24-2014

Re: Too many undersized/giant packets on port warning

which didn't help - still clocking giant errors.

 

What's the MTU size of a 275?

Aruba
Posts: 429
Registered: ‎05-30-2012

Re: Too many undersized/giant packets on port warning

Kevets,

I'm a little surprised that setting the value above 2000 didn't resolve the issue. The APs natively send out Path MTU frames which can result in errors on switch ports but they are normally no larger than 1576. Take a look at this KB article.

 

https://arubanetworkskb.secure.force.com/pkb/articles/FAQ/ArubaOS-AP-MTU-Support

 

Are you sure you don't have Jumbo Frame support enabled in the AP-Group?

 

Best regards,

 

Madani

Frequent Contributor II
Posts: 110
Registered: ‎07-24-2014

Re: Too many undersized/giant packets on port warning

where would I look for that? I see SAP MTU (which is blank) and RAP MTU (1200 bytes, but I don't have any RAPs anyway). I don't see anything in the controller AP Group config that contains the word Jumbo.

Aruba
Posts: 429
Registered: ‎05-30-2012

Re: Too many undersized/giant packets on port warning

Sorry I mispoke earlier, I was thinking about the global Jumbo enable command which is a firewall setting and not under the AP-Group.

 

http://www.arubanetworks.com/techdocs/ArubaOS_64x_WebHelp/Content/ArubaFrameStyles/Network_Parameters/Jumbo_Frame_Support.htm

 

What kind of Controller are your 275's terminating to?

Aruba
Posts: 429
Registered: ‎05-30-2012

Re: Too many undersized/giant packets on port warning

Also when the SAP MTU is blank it means that the AP is going to send Path MTU discovery frames but again, I believe those are only supposed to be as large as 1576. I looking to see if there was any change in that behavior.

Frequent Contributor II
Posts: 110
Registered: ‎07-24-2014

Re: Too many undersized/giant packets on port warning

Controller is a 7210 runnung 6.4.2.1

MVP
Posts: 130
Registered: ‎06-11-2013

Re: Too many undersized/giant packets on port warning

Are you tunneling traffic through the controller or are you using bridge mode?

 

You could try and enable jumbo frames on the HP switch (this is disabled by default), you can enable this on the VLAN: 

 

vlan 1000

  jumbo

  exit

 


ACMX#255 | ACMP | ACCP | AWMP
www.securelink.nl
Frequent Contributor II
Posts: 110
Registered: ‎07-24-2014

Re: Too many undersized/giant packets on port warning

I am tunneling traffic on a VLAN that the switch is unaware of.

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