From: Sasa Milic (smilic2@pexim.co.yu)
Date: Wed Nov 26 2003 - 10:58:28 GMT-3
VTP, CDP etc. would you lowest numbered VLAN allowed on the trunk.
Sasa
Tasuka Amano Hsu wrote:
>
> Thanks Bob,
> But if I disallow the VLAN 1, then the VTP still passthrough or not ?
> I mean if disallow the VLAN, and native to other vlan, then the VTP
> traffics will still at VLAN 1 or will change to native VLAN ?
>
> Sincerely,
> Tasuka
>
> Begin forwarded message:
>
> > Tasuka,
> >
> > Looks to me like instruction 1 is pointing to VTP pruning.
> >
> > I think these instructions are telling us to allow only the listed
> > vlans
> > across the link. The 3550 will allow you to remove vlan 1 from a
> > trunk, so
> > I would do that and make another vlan native. CDP and VTP will come
> > out
> > with vlan 1 tags, but no other vlan 1 traffic will be seen.
> >
> > I guess #3 is talking about UDLD? Maybe someone else can help on this?
> >
> > Good catch on the "vlan dot1q tag native " command.
> >
> >
> > Hope that helps,
> >
> > -Bob Sinclair
> > CCIE #10427, CISSP, MCSE
> > bsin@cox.net
> >
> >
> > ----- Original Message -----
> > From: "Tasuka Amano Hsu" <tasuka@mac.com>
> > To: "ccielab Groupstudy" <ccielab@groupstudy.com>
> > Sent: Friday, November 14, 2003 11:25 AM
> > Subject: 3550 Switch VLAN native ?
> >
> >
> >> Hi, my english not very well, so I need to make sure the I am
> >> understand what it said:
> >>
> >> 1.If a downstream switch does not process a port in a VLAN that your
> >> switch is advertising, you are responsible for making sure that your
> >> switch does not propagate broadcast traffic for those VLANs.
> >>
> >> 2.Create VLANs 10,20,30,40,55,70 and 100. Name each VLAN; VLAN_A,
> >> VLAN_B. etc.
> >>
> >> 3.Configure the two interfaces connecting the 3550's to appear as 1
> >> link to STP, If either of the interface is damaged, both switches
> >> should actively manage one-way links.
> >>
> >> 5.This link should allow all VLANs to travel across with their VLAN ID
> >> in tact. You can not use Cisco Proprietary protocol to archive this.
> >> Every packet that traverses the link must have the VLAN ID, no
> >> exceptions.
> >>
> >> 6.Only allow the defined VLANs across this link.
> >>
> >> So I will configure a port group with a 802.1q trunk mode and make
> >> sure
> >> that link has a native VLAN tag for un-tag traffic packets, but does
> >> that mean I can use VLAN 1 ? or VLAN 10 as the native VLAN. and just
> >> allow the define VLAN traffic passthrough the switch, does it need
> >> include VLAN 1 ?
> >>
> >>
> >> Sincerely,
> >> Tasuka
> >>
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