10-24-2014 06:08 AM
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.
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10-24-2014 09:47 AM
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.
Are you sure you don't have Jumbo Frame support enabled in the AP-Group?
10-24-2014 11:51 AM
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.
10-24-2014 12:15 PM
Sorry I mispoke earlier, I was thinking about the global Jumbo enable command which is a firewall setting and not under the AP-Group.
What kind of Controller are your 275's terminating to?
10-24-2014 12:34 PM
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.
10-26-2014 02:14 PM
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:
ACMX#255 | ACMP | ACCP | AWMP