From: John Matijevic (matijevi@bellsouth.net)
Date: Sat Aug 02 2003 - 15:03:34 GMT-3
Jonathan,
The same situation applies to port cost, however, I can change the port
cost, and see the change, with port priority, I cant. And again I am not
configuring this on the root switch, because by default all ports are going
to be forwarding on the root switch.
Sincerely,
Matijevic
----- Original Message -----
From: "Volkov, Dmitry (IDS Canada)" <dmitry_volkov@ca.ml.com>
To: "'Jonathan V Hays'" <jhays@jtan.com>; "'John Matijevic'"
<matijevi@bellsouth.net>
Cc: <ccielab@groupstudy.com>
Sent: Saturday, August 02, 2003 12:59 PM
Subject: RE: spanning-tree and port priority
> It has effect on upstream (closest to root) switch
>
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a0080
> 0ae96a.shtml
>
> > -----Original Message-----
> > From: Jonathan V Hays [mailto:jhays@jtan.com]
> > Sent: Saturday, August 02, 2003 12:42 PM
> > To: 'John Matijevic'; ccielab@groupstudy.com
> > Subject: RE: spanning-tree and port priority
> >
> >
> > http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/1211
> > 4ea1/3550s
> > cg/swstp.htm#1020470
> >
> > quote:
> > IF A LOOP OCCURS, spanning tree uses the port priority when
> > selecting an
> > interface to put into the forwarding state. You can assign higher
> > priority values (lower numerical values) to interfaces that you want
> > selected first and lower priority values (higher numerical
> > values) that
> > you want selected last. If all interfaces have the same
> > priority value,
> > spanning tree puts the interface with the lowest interface
> > number in the
> > forwarding state and blocks the other interfaces.
> > end quote
> >
> > Note my emphasis on the phrase "if a loop occurs". My
> > interpretation of
> > the paragraph above is that the switch IOS ignores port
> > priority until a
> > loop occurs.
> >
> > HTH
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > Behalf Of
> > John Matijevic
> > Sent: Saturday, August 02, 2003 12:14 PM
> > To: John Matijevic; ccielab@groupstudy.com
> > Subject: Re: spanning-tree and port priority
> >
> >
> > Team,
> > If anyone can get this to work using port-priority command
> > please let me
> > know. Otherwise I am assuming the DocCd is wrong that the
> > port-priority
> > value modification does not make a difference.
> > The only way I could change the state from forwarding to
> > blocking was to
> > adjust the cost. In my initial thinking based on the DocCd I thought I
> > could
> > do this with the port-priority. I even tried using the value
> > 112. Based
> > on
> > the following:
> > Valid priority values are 0, 16, 32, 48, 64, 80, 96, 112,
> > 128, 144, 160,
> > 176, 192, 208, 224, and 240. All other values are rejected.
> >
> > Sincerely,
> >
> > Matijevic
> >
> > ----- Original Message -----
> > From: "John Matijevic" <matijevi@bellsouth.net>
> > To: <ccielab@groupstudy.com>
> > Sent: Saturday, August 02, 2003 11:29 AM
> > Subject: spanning-tree and port priority
> >
> >
> > > Hello Team,
> > > I know there is an ealier thread on 7/7/03, on this that I read, but
> > no
> > > response.
> > > I am trying to change the state from blocking to forwarding on a
> > non-root
> > > switch.
> > > I used the command under interface:
> > > spanning-tree vlan 1 port-priority 100,
> > > By lowering the priority the port should go into forwarding
> > state and
> > the
> > rest
> > > should be blocking. However, this is not happening, I know there was
> > an
> > > earlier thread on this but there was no response.
> > > p1s2#sh span vlan 1
> > >
> > > VLAN0001
> > > Spanning tree enabled protocol ieee
> > > Root ID Priority 24577
> > > Address 000b.be5d.5b80
> > > Cost 19
> > > Port 21 (FastEthernet0/21)
> > > Hello Time 2 sec Max Age 20 sec Forward
> > Delay 15 sec
> > >
> > > Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
> > > Address 000b.46d9.2580
> > > Hello Time 2 sec Max Age 20 sec Forward
> > Delay 15 sec
> > > Aging Time 300
> > >
> > > Interface Port ID Designated
> > Port
> > > ID
> > > Name Prio.Nbr Cost Sts Cost Bridge ID
> > > Prio.Nbr
> > > ---------------- -------- --------- --- ---------
> > --------------------
> > > --------
> > > Fa0/21 128.21 19 FWD 0 24577
> > 000b.be5d.5b80
> > 128.21
> > > Fa0/22 128.22 19 BLK 0 24577
> > 000b.be5d.5b80
> > 128.22
> > > Fa0/23 128.23 19 BLK 0 24577
> > 000b.be5d.5b80
> > 128.23
> > > Fa0/24 100.24 19 BLK 0 24577
> > 000b.be5d.5b80
> > 128.24
> > >
> > > p1s2#
> > > port fa0/21 is the port im trying to change, on the non-root switch.
> > > Any suggestions?
> > > Sincerely,
> > > Matijevic
> > >
> > >
> > >
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