Cord,
You are not providing enough details to help you troubleshoot the issue.With
the information
you have provided is unfortunately not enough. We can only make assumptions
at this point.
How many switches are involved in this STP Domain, what is the status of all
links to the Root
Bridge. Assuming you have you have 3 switches, 2 (sw01/sw02) at the top and
one (sw03) at the bottom.
The port from the top right switch connecting to sw03 port gi1/46 would have
to be in
a blocking state as sw03 port 1/46 is desg FWD; however, if the link between
the top left and
right switch (sw01/sw02) was down(or blocking/Disabled), gi1/46 would be in
Desg FWD.
Maybe the link between sw01 and sw02 has been disable for some violation,
port could be in
a STP inconsistent state.
Good luck
Billy
----- Original Message -----
From: "Tassos Chatzithomaoglou" <[email protected]>
To: <[email protected]>
Sent: Saturday, March 27, 2010 3:51 AM
Subject: Re: [c-nsp] quick spanning tree question
Unless the other side of Gi0/46 is blocked, i don't think it's an issue to
see traffic on a designated port.
On the other hand, if this switch has dual uplinks to the pri/sec root
switches, then somewhere else there must be a blocked port.
--
Tassos
Cord MacLeod wrote on 27/03/2010 08:47:
3 days ago traffic started showing up on the trunk port connecting my top
of rack switches. Each of these switches has it's own better trunk path
to the root bridge. I can't see why any traffic at all would traverse
these links unless the other trunk on g0/45 was down, which it isn't.
Also, spanning tree doesn't claim any topology changes.
switch3#sh spanning-tree root port
VLAN0001 GigabitEthernet0/45
VLAN0100 GigabitEthernet0/45
VLAN0101 GigabitEthernet0/45
VLAN0102 GigabitEthernet0/45
VLAN0120 GigabitEthernet0/45
VLAN0200 GigabitEthernet0/45
VLAN0231 GigabitEthernet0/45
VLAN0250 GigabitEthernet0/45
VLAN0321 GigabitEthernet0/45
VLAN0450 GigabitEthernet0/45
VLAN0777 GigabitEthernet0/45
VLAN0888 GigabitEthernet0/45
switch3#
All vlans read same the Root and Desg port.
VLAN0101
Spanning tree enabled protocol ieee
Root ID Priority 24677
Address 0017.e1d6.e111
Cost 4
Port 45 (GigabitEthernet0/45)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32869 (priority 32768 sys-id-ext 101)
Address 001e.1494.4000
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Gi0/45 Root FWD 4 128.45 P2p
Gi0/46 Desg FWD 4 128.46 P2p
Any ideas?
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