The ARP cache should contain all MAC addresses for the port you have the hub
connected to. So for the sake of arguement, you have 6 workstations
connected to that hub, the switch should cache 7 MAC addresses, the 6
workstations and the hub.
show ip arp fastethernet [port number]
Make sure you also have spanning tree enabled on that port. If it doesn't
work, like someone else said, check layer 1, replace the hub, etc. etc.
etc....
I also know that the old Bay hubs have some type of Management Menu driven
code loaded as well. I'm not sure if you have to specify an uplink port or
what, but you may want to check the hub itself.
Chris
>From: Daniel Cotts <[EMAIL PROTECTED]>
>Reply-To: Daniel Cotts <[EMAIL PROTECTED]>
>To: "'Don Dettmore'" <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
>Subject: RE: connectivity problem
>Date: Tue, 11 Jul 2000 09:52:18 -0500
>
>Maybe a layer one problem?
>Seems that the switch can see the hub. The hub can't see the switch. Do you
>have link both ends? Have you substituted the patch cable between them?
>Alternatively do you have a packet analyzer such as EtherPeek to stick in
>the hub to see if it sees the pings, arp requests from the switch side?
>
> > -----Original Message-----
> > From: Don Dettmore [mailto:[EMAIL PROTECTED]]
> > Sent: Tuesday, July 11, 2000 8:04 AM
> > To: [EMAIL PROTECTED]
> > Subject: connectivity problem
> >
> >
> > Here is an interesting problem.
> >
> > I have a client with a Cisco 2924XL switch. Most stations are
> > directly connected to the switch, however off of one of the switch
> > ports is an old Bay 10mb/s hub.
> >
> > The problem is that stations connected to the hub cannot communicate
> > with stations connected to the switch. Switch stations CAN
> > communicate with switch stations, and hub stations CAN communicate
> > with hub stations.
> >
> > The switch port connected to the hub appears to recognize the hub -
> > it is up/up and has detected 10mb half duplex. I tried manually
> > entering these settings with no effect.
> >
> > It appears to be an arp problem - if I debug arp and then try to ping
> > a station connected to the hub, arps are sent out, but no replys are
> > received. This happens whether the switch itself tries to ping a hub
> > host, or a if a switch station does so. Interestingly enough tho, if
> > a hub station pings another hub station, the arp shows up on the
> > switch debug console - it is definitely seeing the traffic!
> >
> > Any suggestions would be greatly appreciated.
> >
> > Thanks!
> >
> > Don Dettmore
> > CCNP, MCSE, CNE
> >
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>
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