[nsp] Weird Error on Cat6k

Chris Roberts croberts at bongle.co.uk
Sun Mar 16 19:37:45 EST 2003

Looks to me like some provider on this peering LAN has a dodgy device with a
failing card, or bugs which is spitting out dodgy frames, or failing to
encapsulate properly/generate IP crc's properly.

I suppose it could also be a problem at the exchange level, although if it's
only a single peer I wouldn't suspect it.

If it's always the same neighbour I'd get in touch with the person in
question and have them take a look at their kit/work with their vendor. Do
you know the vendor of the affected peer? I've heard of certain vendors
having problems like these before in particular.


----- Original Message -----
From: "Stephen J. Wilcox" <steve at telecomplete.co.uk>
To: <cisco-nsp at puck.nether.net>
Sent: Sunday, March 16, 2003 4:30 PM
Subject: [nsp] Weird Error on Cat6k

> Hello,
> just wondering if anyone has ever seen the following error messages and
> what they mean exactly. I cant find anything on TAC and nothing comes up
from a
> google search either. (Platform is Cat6k/SUP1A/12.1(13)E4)
> Its curious that a couple minutes later a large peer flaps for the next 90
> during which I see some more MLS LEN errors (never seen before, altho I
> regularly see MLS TOO SHRT). This is on a public peering LAN and I note
> peers see sessions flapping with this neighbor at this time also
suggesting this
> is something originating from the peer not me.
> TIA, Steve.
> *Mar 15 22:57:40: %MLS_STAT-SP-4-IP_CSUM_ERR: IP checksum errors
> *Mar 15 22:58:06: %CENTAURI-SP-4-INTR_THROTTLE: Throttling "IP_CSUM" Intr.
> Exceeded permitted 1000/100 intrs/msec
> *Mar 15 22:58:06: %PERSEUS-SP-4-INTR_THROTTLE: Throttling "IP_CSUM_ERR"
> Exceeded permitted 1000/100 intrs/msec
> *Mar 15 22:58:10: %MLS_STAT-SP-4-IP_LEN_ERR: MAC/IP length inconsistencies
> *Mar 15 22:59:40: %MLS_STAT-SP-4-IP_TOO_SHRT: Too short IP packets
> Mar 15 23:02:43: %BGP-3-NOTIFICATION: received from neighbor xxx 4/0
> (hold time expired) 0 bytes
> Mar 15 23:02:43: %BGP-5-ADJCHANGE: neighbor xxx Down BGP Notification
> received
> Mar 15 23:03:36: %BGP-5-ADJCHANGE: neighbor xxx Up
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