From: ccie2be (ccie2be@nyc.rr.com)
Date: Fri Sep 05 2003 - 12:33:48 GMT-3
Hi Navaid,
Thanks for getting back to me.
How can that be? Are you saying a Cat 3550 can have more than one native
vlan? And, that different ports on the same Cat 3550 can be in different
native vlans?
Won't broadcast frames from a native vlan be switched to all ports
configured in a native vlan which condradicts the whole concept of a vlan as
a broadcast domain?
dt
----- Original Message -----
From: <navaid@rogers.com>
To: "ccie2be" <ccie2be@nyc.rr.com>; "Group Study" <ccielab@groupstudy.com>
Sent: Friday, September 05, 2003 10:14 AM
Subject: Re: 3550 and IP Phone Verification
> Keep native vlan 1 for your trunk.
> Make vlan 10,20,30,40 native for access ports based on your requirements.
>
> Navaid
> >
> > From: "ccie2be" <ccie2be@nyc.rr.com>
> > Date: 2003/09/05 Fri AM 10:00:31 EDT
> > To: "Group Study" <ccielab@groupstudy.com>
> > Subject: 3550 and IP Phone Verification
> >
> > Hi everyone,
> >
> > I want to confirm my understanding of the situation where IP Phones are
> > connected to a 3550.
> >
> > Let's say that a firm has just upgraded their switches to Cat 3550's in
> > preparation of a migration to IP Telephony. With the upgrade they have
the
> > same number of ethernet ports that they had with the old switches and
their
> > intention is to have all the PC's that were previously connected to the
old
> > switches connect via the access port on the IP Phone which in turn will
be
> > connected to the new Cat 3550 switches. Currently, their PC's reside in
4
> > different vlans, vlan 10, 20, 30 and 40 and all of these vlans exist in
each
> > of their switches. Their plan is to have all the IP Phones in one voice
vlan.
> > And, they need the PC's to remain in whatever vlan they're already in
after
> > the migration.
> >
> > Can this be achieved?
> >
> > Based on what I understand, this can't be done. Here's the reason.
Please
> > correct me if I'm wrong on this.
> >
> > Data traffic from the PC's attached to the access port of the IP Phones
is
> > carried in untagged frames in the native vlan. While the native vlan
can be
> > assigned any vlan number there can be only 1 native vlan which, by
default, is
> > vlan 1. And, the native vlan must be the same on all the Cat 3550's
since
> > 802.1q trunks area being used.
> >
> > While this is my understanding from reading the 3550 config guide, this
> > limitation doesn't seem reasonable or smart. Would Cisco design the
3550 so
> > that PC's that were in different vlans would be forced to be in the same
vlan
> > if the PC's were connected via the IP Phone?
> >
> > Thanks; I greatly appreciate any help.
> >
> > dt
> >
> >
> > _______________________________________________________________________
> > You are subscribed to the GroupStudy.com CCIE R&S Discussion Group.
> >
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
> >
>
> 1
>
>
> _______________________________________________________________________
> You are subscribed to the GroupStudy.com CCIE R&S Discussion Group.
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Wed Oct 01 2003 - 07:24:23 GMT-3