From: NET HE (he_net@hotmail.com)
Date: Sun Sep 16 2007 - 17:14:00 ART
I agree with Gregory.
Root port selection processes as below if a switch receives multiple BPDU
hellos at multiple ports:
1)lowest bridge-id of neighboring switches
2)if equal, in other words, all BPDUs are from same switch,
lowest accumulative cost to root bridge (accumulative cost = port cost in BPDU
message + local port cost)
3)if equal, lowest port priority in BPDU message from upstream switch, the
upstream switch uses it to influence downstream switch root port selection
4)if equal, lowest port number at local switchBest Regards,Net (Xin) He
> Date: Sun, 16 Sep 2007 12:52:20 -0400> From: ggombas@gmail.com> To:
mkbcoolman@gmail.com> Subject: Re: Spanning-tree port priority versus
port-cost> CC: slevin.kremera@gmail.com; ccielab@groupstudy.com> > Correct me
if I'm wrong, but I don't believe port priority is used to> affect the local
switch, it is used for influencing the downstream> switche's path selection.>
> In this simple case:> > SW1> | |> SW2> > If SW1 is the root you use
configure port priority on SW1 to influence> which port will be SW2's root
port and which port will be blocking. If> the configuration states you must do
the configuration on SW2, then> configure cost on SW2.> > Also port priority
is only useful when you have multiple connections> between two switches.> >
HTH> > On 9/16/07, Keith Bizzell <mkbcoolman@gmail.com> wrote:> > It depends
on the direction. Port cost will affect spanning tree> > down-stream, but
port-priority will affect the local switch. And yes,> > wording has everything
to do with it. For instance, 'Configre S1 so that it> > prefers fa0/23 for all
vlan 10 traffic' would point you to port priority.> > 'Configure S2 so that S1
prefers fa0/23 for all vlan 10 traffic' would> > require cost. Subtle...so be
careful.> >> >> >> > On 9/16/07, slevin kremera <slevin.kremera@gmail.com>
wrote:> > >> > > Hi experts> > >> > > when does one use port-priority and
port-cost.wud that depend on how the> > > question is worded in the exam..can
someone gimme some examples> > >> > >> > > thks> > > SK> > >> > >
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