From: Church, Chuck (cchurch@netcogov.com)
Date: Mon Jan 16 2006 - 13:04:27 GMT-3
You need to disable all traffic on the 2950 switchport that would have
it's own MAC address in the frame. So for the port facing the cable
modem, disable:
Spanning tree
Any trunk-negotiation frames
And channel-negotiation frames
CDP
Chuck Church
Lead Design Engineer
CCIE #8776, MCNE, MCSE
Netco Government Services - Design & Implementation
1210 N. Parker Rd.
Greenville, SC 29609
Home office: 864-335-9473
Cell: 703-819-3495
cchurch@netcogov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4371A48D
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Mike O
Sent: Monday, January 16, 2006 9:39 AM
To: Joseph Eleazar; ccielab@groupstudy.com
Subject: Re: OT-switch MAC addresses
Joe,
As soon as I plug in the modem, it records the 2950's switchport MAC
address. If I use a cheapy linksys switch it doesn;t. Is there anyway to
disable the switchport MAC?
----- Original Message -----
From: "Joseph Eleazar" <joseph_eleazar@hotmail.com>
To: <mikeeo@email.msn.com>; <ccielab@groupstudy.com>
Sent: Sunday, January 15, 2006 11:35 PM
Subject: RE: OT-switch MAC addresses
> Mike,
>
> Assuming that all ports on the 2950 and 3550 are on the same vlan, use
> vlan 1 for simplicity, then:
>
> 1. Make sure that the interface vlan 1 on both switches are not set up
for
> dhcp.
> 2. Make sure that the trunk between the switches are passing vlan 1.
> 3. Make sure that the ethernet port on the 2620 that connects to the
> switch is configured for dhcp.
>
> With that setup and the cable modem connected to the 2950, the the
2620 on
> the 3550 should grab an IP address, that should leave 2 addresses for
2
> more devices that connect to either switch to grab a dhcp address from
the
> cable modem.
>
> Joe
>
>
>>From: "Mike O" <mikeeo@email.msn.com>
>>Reply-To: "Mike O" <mikeeo@email.msn.com>
>>To: <ccielab@groupstudy.com>
>>Subject: OT-switch MAC addresses
>>Date: Sun, 15 Jan 2006 13:20:51 -0500
>>
>>My ISP (Comcast) assigns IP addresses per MAC. And my cable modem
allows 3
>>MAC addresses to be registered. My problem is I want my 2620 in my lab
to
>>be assigned an address but when I plug the cable modem into my 2950 it
>>picks of the MAC of the switch port and doesn't let the 2620 register.
Is
>>there anyway to disable the mac address of the port?
>>
>>My 2620 is plugged into my 3550 which is trunked to the 2950 and VLAN
is
>>created to carry internet traffic to the cable modem, but like I said
it
>>picks up the switchport MAC instead.
>>
>>Thanks,
>>
>>Mike
>>
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