Many hubs (including most old Bay/Synoptics hubs) can have an ip address
assigned to the hub itself (not to individual ports on the hub) for management
purposes. In this case the switch could indeed have an arp cache entry for the
hub.
JMcL
---------------------- Forwarded by Jenny Mcleod/NSO/CSDA on 14/07/2000 15:31
---------------------------
Omar Khawaja <[EMAIL PROTECTED]> on 13/07/2000 11:12:56
Please respond to Omar Khawaja <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc: (bcc: JENNY MCLEOD/NSO/CSDA)
Subject: Re: connectivity problem
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
> >> >
> >> > ___________________________________
> >> > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
> >> > FAQ, list archives, and subscription info: http://www.groupstudy.com
> >> > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> >> >
> >>
> >>___________________________________
> >>UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
> >>FAQ, list archives, and subscription info: http://www.groupstudy.com
> >>Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> >
> >________________________________________________________________________
> >Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
> >
> >___________________________________
> >UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
> >FAQ, list archives, and subscription info: http://www.groupstudy.com
> >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> >
>
> ___________________________________
> UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
> FAQ, list archives, and subscription info: http://www.groupstudy.com
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> ---
___________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
___________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
