Yes, I know it. SW1 is the root and all port are forwarding for all Vlans.
The problem was is por 0/24 of SW2. It was not the root port or the designated bridge, but the state of por 0/24 for Vlan 1 was forwarding. For the other Vlans it was blocking, as expected. "Larry Letterman" @groupstudy.com em 14/11/2002 15:31:24 Favor responder a "Larry Letterman" Enviado Por: [EMAIL PROTECTED] Para: [EMAIL PROTECTED] cc: Assunto: Re: Strange Spanning-Tree Behavior [7:57449] The root bridge will always be forwarding and the other end will be blocked in a network that is working correctly.... Larry Letterman Cisco Systems [EMAIL PROTECTED] wrote: >Could you explain? > > > > > >Peter van Oene em 14/11/2002 10:28:04 > >Para: "[EMAIL PROTECTED]" >cc: [EMAIL PROTECTED] > >Assunto: Re: Strange Spanning-Tree Behavior [7:57449] > > >Only one side of a given link will block and thus what you are seeing is >normal behavior. > >On Thu, 2002-11-14 at 11:00, [EMAIL PROTECTED] wrote: > >>Does anybody know what is this? On interface fa0/24 of SW2, the state of >>spannnig-tree for Vlan1 was forwarding and for Vlan11 was blocking . >> >All > >>the values, bridge priority - port priority - port cost, were the default >>values. I expected both Vlans as blocking. >> >>The network is: >> >> SW1(fa0/22) -------(fa0/22) SW2(fa0/24) >> >-------(fa0/24) > >> SW3 >> (fa0/23)|__________________________________________|(fa0/24) >> >>After almost get crazy, I figured out that maybe the switch was crazy, so >> >I > >>erased the configuration, reload the switch and typed the configuration >>back. And it works fine. >> >>Before that, I just reload the switches, and there was no changes. >> >> >> SW2#sh spann int fa 0/24 >> Interface Fa0/24 (port 38) in Spanning tree 1 is FORWARDING >> Port path cost 19, Port priority 128 >> Designated root has priority 32768, address 0002.fd34.9180 >> Designated bridge has priority 32768, address 0005.326d.65c0 >> Designated port is 38, path cost 19 >> Timers: message age 0, forward delay 0, hold 0 >> BPDU: sent 31481, received 604975 >> >> SW3#sh spann int fa 0/24 >> Interface Fa0/24 (port 38) in Spanning tree 1 is BLOCKING >> Port path cost 19, Port priority 128 >> Designated root has priority 32768, address 0002.fd34.9180 >> Designated bridge has priority 32768, address 0005.326d.65c0 >> Designated port is 38, path cost 19 >> Timers: message age 2, forward delay 0, hold 0 >> BPDU: sent 605190, received 32565 >> >> >> >> SW 1 >> >> >> host SW1 >> ! >> interface FastEthernet0/1 >> duplex half >> speed 10 >> switchport access vlan 11 >> ! >> interface FastEthernet0/2 >> duplex half >> speed 10 >> ! >> interface FastEthernet0/3 >> duplex half >> speed 10 >> ! >> interface FastEthernet0/4 >> duplex half >> speed 10 >> ! >> interface FastEthernet0/5 >> duplex half >> speed 100 >> ! >> interface FastEthernet0/22 >> description *** connection to SW2 *** >> switchport mode trunk >> ! >> interface FastEthernet0/23 >> description *** connection to SW3 *** >> switchport mode trunk >> ! >> Int vlan 1 >> ip ad 1.1.1.254 255.255.255.0 >> >> >> SW 2 >> >> host SW2 >> ! >> interface FastEthernet0/22 >> description *** connection to SW1 *** >> switchport mode trunk >> ! >> interface FastEthernet0/24 >> description *** connection to SW3 *** >> switchport mode trunk >> ! >> Int vlan 1 >> ip ad 2.2.2.254 255.255.255.0 >> >> SW 3 >> >> host SW3 >> ! >> interface FastEthernet0/23 >> description *** connection to SW1 *** >> switchport mode trunk >> ! >> interface FastEthernet0/24 >> description *** connection to SW2 *** >> switchport mode trunk >> ! >> Int vlan 1 >> ip ad 3.3.3.254 255.255.255.0 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=57464&t=57449 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
