hubs usually don't have NICs for their ports. they are functionally
layer 1 devices, so therefore don't understand what a MAC address is.
Bridges and Switches, on the contrary, are layer 2 devices and do
unnderstand MAC addresses..
Dick Silva wrote:
>
> / Question here:
> You say if you have six hosts (workstations) and the hub you have 7 MAC
> addresses.
> Now I understand the six workstations have NICs. But does the hub port also
> have a NIC?
> Would a printer connected to the same hub port have a NIC also? I
> understand that the hub port and printer would each be considered a host.
> So does this mean that all hosts also have NICs?
> Dick Silva
>
> -----Original Message-----
> From: Chris H <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>; [EMAIL PROTECTED]
> <[EMAIL PROTECTED]>; [EMAIL PROTECTED] <[EMAIL PROTECTED]>
> Date: Tuesday, July 11, 2000 10:53 PM
> Subject: RE: connectivity problem
>
> >
> >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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