From: Andrew Dempsey (apdccie@gmail.com)
Date: Tue Oct 07 2008 - 09:40:08 ART
Cost is taken into consideration before port priority in choosing a root
port from the same upstream bridge and with the same cost associated per
port. Remember also that port priority is configured on the upstream device
and that cost is configured on the downstream device.
On Mon, Oct 6, 2008 at 2:42 PM, Mansour Mohammed <m.mohammed@nesma.net>wrote:
> Both Port-priority & Span cost would work, I think port-por is how the
> local switch elect its root and span cost for entire STP domain
> depend on what you want to achieve ........
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Hobbs
> Sent: 06 October 2008 03:06
> To: S Malik
> Cc: Ali Mousawi; nouman abbasi; Cisco certification
> Subject: Re: Odd / Even Vlans
>
> I understand your solution and I think it would be the better design. But
> based on nouman's question "how could I configure Odd Vlans on one ports
> and
> even Vlans on other ports" it seems like they don't care about redundancy,
> but that's just my interpretation.
>
> I guess it depends on what the "grading script" or grader would look for to
> verify. For example, "show interface trunk" has a section for vlans in
> forwarding state and not pruned, and a section for allowed vlans.
>
> I didnt even think about changing STP configuration but it is definitely
> something to remember.
>
> On Sun, Oct 5, 2008 at 5:47 PM, S Malik <ccie.09@gmail.com> wrote:
>
> > Ali,
> > Your solution fits into that category.
> >
> >
> > On 10/5/08, Ali Mousawi <mousawi.ali@gmail.com> wrote:
> >>
> >> What if one trunk fails?
> >>
> >> On Sun, Oct 5, 2008 at 4:34 PM, Hobbs <deadheadblues@gmail.com> wrote:
> >>
> >> > Why couldn't you use "switchport trunk allowed vlan" ?
> >> >
> >> >
> >> > On Sun, Oct 5, 2008 at 5:30 PM, Ali Mousawi <mousawi.ali@gmail.com>
> >> wrote:
> >> >
> >> >> Hey Nouman,
> >> >>
> >> >> As i understand from you post you need to manipulate you spanning
> >> >> tree root ports. either using priority or cost commands depends on
> >> >> where the configuration is being done.
> >> >>
> >> >> So lu need to make fa0/10 in the FWD state for ODD vlans and BLK
> >> >> for
> >> EVEN
> >> >> while fa0/11 should be the inverse.
> >> >>
> >> >> Keep in mind this rule:
> >> >>
> >> >> To affect how the local switch elects its root port change the
> >> >> spanning-tree port-cost. (Cost is cumalative throughout the SPT
> >> >> domain).
> >> >>
> >> >> To affect how a downstream switch elects its root port, change the
> >> >> spanning-tree port-priority. Port-priority is only locally
> >> >> significant between directly connected switches.
> >> >>
> >> >> HTH
> >> >>
> >> >> On Sun, Oct 5, 2008 at 3:38 PM, nouman abbasi
> >> >> <abbasi.nouman@gmail.com
> >> >> >wrote:
> >> >>
> >> >> > Hi,
> >> >> > I have trunk between SW1 && SW2 on ports fa 0/10 and fa 0/11 ;
> >> >> >
> >> >> > On SW1 how could I configure Odd Vlans on one ports and even
> >> >> > Vlans on
> >> >> other
> >> >> > ports
> >> >> >
> >> >> > ODD Vlans on fa 0/10
> >> >> > EVEN Vlans on fa 0/11
> >> >> >
> >> >> > Assuming I have :
> >> >> > Vlan 1, Vlan 10 , Vlan 11, Vlan 12, Vlan 13, Vlan 14, Vlan 15,
> >> >> > Vlan
> >> 16,
> >> >> > Vlan
> >> >> > 17
> >> >> >
> >> >> > Regards
> >> >> >
> >> >> >
> >> >> > Blogs and organic groups at http://www.ccie.net
> >> >> >
> >> >> >
> >> _____________________________________________________________________
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> >>
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>
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>
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