Re: [nsp] Ethernet errors between 7500/PA-FE-TX and 3548XL switch

From: George Robbins (grr@shandakor.tharsis.com)
Date: Tue Jun 13 2000 - 17:58:34 EDT


So, who's fault it it - the router for not encapsulating the keep-alives
or the switch for not tolerating perfectly good albeit unencapsulated
ethernet packets?

Of course it *would* be nice if Cisco would make the PA-FE autonegotiate
and handle 10/100 like any $50 PCI-based NIC. 8-(

                                                George

> To: c.spurgeon@mail.utexas.edu
> Cc: cisco-nsp@puck.nether.net
> Subject: Re: [nsp] Ethernet errors between 7500/PA-FE-TX and 3548XL switch
> From: sthaug@nethelp.no
> Date: Tue, 13 Jun 2000 21:15:23 +0200
>
> > In my tests there were no further errors. CDP packets appear to be
> > correctly encapsulated in ISL mcast frames.
>
> Yes, that's what I see here too.
>
> > I also noticed that when keepalive is disabled, the router interface
> > doesn't respond to the link state correctly. Disconnecting the cable
> > so that the link light is off causes the router interface to toggle
> > down and then back up. After which the interface stays up/up, even
> > though the link is down. After re-enabling keepalives the router
> > correctly flags the "line protocol down" state when the link is
> > disconnected.
>
> I concluded that I preferred to keep the keepalives even if it means
> apparent CRC errors. Hopefully a newer IOS release will fix this.
>
> Steinar Haug, Nethelp consulting, sthaug@nethelp.no
>
>



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