topic Re: Excessive undersized/giant packets between switch HP and Cisco in Switches, Hubs, and Modems

Excessive undersized/giant packets between switch HP and Cisco

jcp_1 — Wed, 01 Aug 2007 09:10:31 GMT

Hi

I've this warning on my switch HP 2524 (F.05.09). The port 1 is connected to switch cisco 2950 (IOS : 12.1(12c)EA1).

W 08/01/07 15:13:30 FFI: port 1-Excessive undersized/giant packets. See help.
W 08/01/07 15:13:30 FFI: port 1-Excessive jabbering. See Help

On switch HP interface 1, I've this configuration.
Vlan1 : Untagged
Vlan6 : Tagged
Vlan8 : Tagged
Vlan10 : Tagged
Vlan200 : Tagged

On Switch Cisco, I've this configuration
switchport mode trunk

By default, vlan 1 is native vlan and mtu at 1500.

I don't see why I've this warning, if somebody has a small idea.

Thanks

Re: Excessive undersized/giant packets between switch HP and Cisco

Mohieddin Kharnoub — Wed, 01 Aug 2007 23:22:39 GMT

Hi

I believe you better check the Mini-GBIC in case you connect by fiber.

Also the following link will be helpful in your troubleshooting:

http://www.hp.com/rnd/library/troubleshoot_lan.htm

Good Luck !!!

Re: Excessive undersized/giant packets between switch HP and Cisco

Paulen — Thu, 02 Aug 2007 01:46:55 GMT

You wouldn't find a miniGbic in a 2524 - especially not in port 1. We see the same thing from time to time between ports on certain gear - seems inevitable.

Just be sure you use the same duplex settings; AUTO/AUTO or 100Fdx/100Fdx. On Cisco you adjust duplex and speed in two steps.

/BT

Re: Excessive undersized/giant packets between switch HP and Cisco

jcp_1 — Thu, 02 Aug 2007 02:10:48 GMT

On switch HP and Cisco, interfaces are configured to auto/auto (100 full).

Thanks

Re: Excessive undersized/giant packets between switch HP and Cisco

Mohieddin Kharnoub — Thu, 02 Aug 2007 02:25:02 GMT

Hi

Sometimes, manually configured ports can be less headache :)

Sorry for the Mini-GBIC, it should be transceiver.

Good Luck !!!

Re: Excessive undersized/giant packets between switch HP and Cisco

jcp_1 — Thu, 02 Aug 2007 04:04:20 GMT

I try to force speed and duplex for solve the problem. I would do that this evening because I don't want to cut the production. (it is 11:00 am in France)

Thanks

Re: Excessive undersized/giant packets between switch HP and Cisco

rick jones — Thu, 02 Aug 2007 11:37:07 GMT

If both ends have negotiated to the same duplex setting don't mess with it.

It seems a little odd that you would have a trunk configured on one end, but not the other.

Re: Excessive undersized/giant packets between switch HP and Cisco

Mohieddin Kharnoub — Thu, 02 Aug 2007 14:27:01 GMT

Hi Rick

I had a similar problem before, a Cisco ISR 2800 series Router connected to 3500, both are on Auto, and the Cisco ethernet interface was showing Full duplex, and on the 3500 (k.12.05) was showing half duplex, and many drops happening.

So after setting it manually on both sides to 100-full everything back to normal.

Good Luck !!!

Re: Excessive undersized/giant packets between switch HP and Cisco

Teknisk Drift_1 — Fri, 03 Aug 2007 05:32:37 GMT

We have seen the Excessive.... error messages occur intermittently on ports when a link is established. So once in a while they'll turn up out of the blue, when two switches are connected, or a server is booted. But they only occur once, and then no more, so we haven't looked into it. Seems like it's just some hickup in the link establishment.

I'd go with the manual config, too. There's are sometimes subtle compatibility problems between switches from different makers, that prevent the auto-negotiation from working properly.

We've also seen that sometimes switches of other brands (Nortel, Bay) have failed to communicate properly with ProCurves after the other-brand switch has been rebooted. Ports have had to be shut down and reopenened to make it all work.

As for the trunk, a Cisco trunk is just a port that tags VLANS (ie. that bundles multiple VLANS on one link).