topic Re: Problems with linkloop in Operating System - HP-UX

Problems with linkloop

wardend — Tue, 11 Nov 2008 18:33:31 GMT

We have in environment filled with HP equipment, both new and middle-age. We have Ignite post install scripts that use linkloop. Recently we discovered that any MAC address we put in a linkloop would come back "OK", suggesting a link. I am assuming at this stage that we have a machine that is responding to all MAC addresses. Has anybody seen anything like this?

Re: Problems with linkloop

OFC_EDM — Tue, 11 Nov 2008 18:48:45 GMT

I've never seen that problem.

FYI though..the command is being phased out with hp-ux 11i...see link below for details.

HP-UX 11i v3 non-critical impact:
Network management commands lanadmin, lanscan and linkloop commands are deprecated; use nwmgr (NcWn938)

http://h21007.www2.hp.com/portal/download/files/unprot/STK/HPUX_STK/impacts/i938.html

Re: Problems with linkloop

OFC_EDM — Tue, 11 Nov 2008 18:58:20 GMT

Which OS version are you running?
What's your patch level?
Which version of Ignite are you using?

Can you post the exact command with which you're seeing the issue?

Regards

Re: Problems with linkloop

wardend — Tue, 11 Nov 2008 19:48:03 GMT

We are running 11.31 mostly but some 11.23. Ignite actually runs fine. The post-install scripts we use to configure our private lans fails due its use of linkloop. It is very weird. I can take a linkloop command to any other machine in the environment and change a digit to a non-existant MAC address and it will still indicate connectivity.

Re: Problems with linkloop

Torsten. — Tue, 11 Nov 2008 19:55:21 GMT

Strange ... but how about nwmgr?

Try what it gives, e.g.

nwmgr --diag -A dest=mac_addr [--it number] [-A pktsize=bytes] [-A timeout=seconds] -c lan_instance

Re: Problems with linkloop

rick jones — Wed, 12 Nov 2008 00:20:15 GMT

When you run the linkloop command, can you do so while taking a packet trace on the interface and see what if anything might be happening on the wire?

Re: Problems with linkloop

wardend — Wed, 12 Nov 2008 16:04:34 GMT

I think we have found the problem. We removed the lan connection to a Onboard Administrator/ILO port on an HP 7000 blade. When disconnected the problem went away. We are investigating what's causing this particular unit to mis-behave. Thanks for your help.