Here are the answers that you need plain and simple:
Yes you can have many, many different MAC address on the same switch port.
This happens when a hub with multiple PCs is uplinked to one Cisco
switchport. But that DOESN'T solve YOUR problem.
There are two simple ways to get TWO distinct VLANs through one CAT5 cable.
The first way allows you to maintain 100MB speed and/or Full Duplex:
1. Purchase a cheap non-cisco switch that supports 802.1q trunking or a
Cisco switch that does either ISL or 802.1q trunking. The one caveat here
is that if your MAIN switch in the closet is a CAT4000, you will HAVE to do
802.1q. Or, if you are running old switch code on a CAT5500, you will have
to get a cheap Cisco switch that does ISL trunking.
2. Place the cheap switch at your desk and configure your single CAT5 cable
to be either an ISL or 802.1q trunk on your MAIN switch, and on your little
desktop switch. Bingo, you can then configure any ports on the desktop
switch to support any VLANs in your VTP domain.
The Cheapest way to solve your problem forces you to do only 10MB speed.
You might be able to support Full Duplex over this configuration:
1. Simply spilt the CAT5 cable. You can either purchase splitters or make
your own. A CAT5 splitter has a male RJ-45 on one end and two female
RJ-45s on its other end, labeled port "A" and port "B". You will need one
for the jack at your desk and one for the wiring frame in the wiring
closet. You will then run individual CAT5 patch cables from the splitter
to two distinct switch ports on your MAIN switch and configure each of them
to different VLANs. Wallah! You will then have two ports at your desk on
two different VLANs.
John Squeo
Technical Specialist
Papa John's Corporation
(502) 261-4035
"NetEng"
cc:
Sent by: Subject: Re: MAC address
and VLANs [7:23950]
nobody@groupstudy.
com
10/24/01 09:52
AM
Please respond
to
"NetEng"
Thanks for the replies. The two MAC addresses would come from the two PC's
in an office. The would both connect in to a hub and then the hub would
uplink to the cisco switch. I need one pc in VLAN1 and one pc in VLAN2,
from
what you and Dennis stated this will not work. I appreciate the comments
though.
Collin
""Leigh Anne Chisholm"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Actually, that's not correct. The original specification for VLANs from
> what I understand mandates that only one VLAN can be assigned to a port,
but
> manufacturers such as 3COM decided to do otherwise and support multiple
> VLANs per port. Cisco responded by creating (on certain switches such as
> the Catalyst 2900XL) an administrator to configure a port to be a member
of
> more than one VLAN at a time when using a membership mode known as
> "Multi-VLAN". A Multi-VLAN port can belong to up to 250 VLANs; the actual
> number of VLANs to which the port can belong depends on the capability of
> the switch itself. Although the concept is similar, this membership mode
is
> different than "trunking". The caveat to this feature is that the
> Multi-VLAN membership mode cannot be configured on a switch if one or
more
> ports on the switch have been configured to trunk.
>
> For more information on this feature, search Cisco's website using the
> keyword phrase "switchport multi".
>
> As for answering NetEng's question--I can't quite determine where
multiple
> MAC addresses share the same switch port. Could you identify which
switch
> that is?
>
>
> -- Leigh Anne
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> > Dennis
> > Sent: Tuesday, October 23, 2001 3:48 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: MAC address and VLANs [7:23950]
> >
> >
> > Cisco will recognize multiple macs on a single port but they must
> > all be in
> > the same vlan. Vlan assignment is per port. Your other option
> > would be to
> > replace the non cisco hub with a cisco switch which is trunked to the
main
> > switch.
> >
> > --
> >
> > -=Repy to group only... no personal=-
> >
> > ""NetEng"" wrote in message
> > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > Here's my situtation. I have a corporate PC with an IP address of
> > 10.10.x.x
> > > and in the same office (and same physical network) another
> > device with an
> > IP
> > > address of 192.168.100.x Both devices are connected to a small
> > hub/switch
> > > which in turn is connected to a cisco switch. Can I have the
> > 10.10.x.x be
> > > apart of one vlan and the 192.168.100.x be a member of another or the
> > > default vlan? Can cisco switches recognize multiple MAC addresses on
a
> > > single switch port (if so, how many?) and be smart enough to know
which
> > vlan
> > > which MAC address belongs to? This would save me hours (otherwise I
have
> > to
> > > run cable for connections to our corporate network and
> > connections to our
> > > test network in every cube :-( ). TIA
> > >
> > > PS I understand the best way to do this would be to connect each
device
> > into
> > > the cisco switch, but I only have a single cable run to each
cube/office
> > >
> > >
> > > (corporate pc)10.10.x.x
> > > |
> > > PC PC (test network) 192.168.100.x
> > > | |
> > > \ /
> > > \ /
> > > SWITCH/HUB (non-cisco)
> > > |
> > > |
> > > CISCO SWITCH
> > > VLANs
> > > -------- ----------
> > > | | | |
> > > | corp | | test |
> > > -------- -----------
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