[nsp] Catalyst6509 GE interface hang without any indication

[Mohacsi Janos]

On Tue, 25 May 2004, Joe Shen wrote:

> Hi,
>
>
> We are using a Catalyst6509 as distribution layer switch which is
> connected to M160 by GE interface( OSPF run on both side)..
>
> Yesterday we noticed that no traffic occur on that GE link at some
> special time.
>  When trying to "ping"  the other side on either platform,  no responds
> got.
>  But, on either M160 or Catalyst6509 "sh interface"
> showed  no errors information.  When checking syslog, there is no error
> record  either.
>
> We also checked the configuration record for both system, and found
> there is no  modification in configuration at the time when
> link load becomes zero.
>
> As last resort, we solved this problem by  "shutdown"  GE VLAN interface
> on Catalyst6509, and  "no shut" consequently, then everything
> come up.
>
> But, today another Catalyst6509 of our system hanged on its uplink GE.
> We have to restarted the box to solve. Different from the catalyst6509
> hanged yesterday, this catalyst6509 have netflow-export enabled for
> month.  ( I included the detailed info at the end )
>
> I tried hard to find out the reason but  can't find any information
> related on Cisco's site.

Try to setup fixed settings on GE interface: duplex full, and no
negotiation. Cisco and other boxes tend to not like some kind of
autonegotiation. But in this case the interface goes down... If you fix
the some config settings on the both side, that might resolve your
problem.

Regards,
	Janos Mohacsi
	Network Engineer,
	NIIF/HUNGARNET