From: chrisa (chris_atkins@blueyonder.co.uk)
Date: Mon Dec 16 2002 - 13:53:35 GMT-3
Hi
I am going mad I have the following set up.
=20
=20
=20
=20
=20
=20
=20
Isl
=20
=20
Switch2=20
=20
=20
=20
=20
=20
=20
=20
=20
=20
There is a ISL trunk on both links but spanning =
tree is not working on any vlan.
Both 3550 are set up as below (identical results )
On eiher switch you do not receive BPDU but do send so both become =
roots.
Am I missing something here should not one of the ports go into =
blocking mode for vlan 100????
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname switch1
!
!
ip subnet-zero
!
spanning-tree extend system-id
!
!
!
interface GigabitEthernet0/1
switchport trunk encapsulation isl
switchport mode trunk
no ip address
!
interface GigabitEthernet0/2
switchport trunk encapsulation isl
switchport mode trunk
switch1#sh spanning-tree vlan 100=20
VLAN100 is executing the ieee compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 100, address =
000a.410b.ce80
Configured hello time 2, max age 20, forward delay 15
We are the root of the spanning tree
Topology change flag not set, detected flag not set
Number of topology changes 1 last change occurred 00:01:51 ago
from GigabitEthernet0/1
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15=20
Timers: hello 1, topology change 0, notification 0, aging 300
Port 1 (GigabitEthernet0/1) of VLAN100 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.1.
Designated root has priority 32868, address 000a.410b.ce80
Designated bridge has priority 32868, address 000a.410b.ce80
Designated port id is 128.1, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 70, received 0
Port 2 (GigabitEthernet0/2) of VLAN100 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.2.
Designated root has priority 32868, address 000a.410b.ce80
Designated bridge has priority 32868, address 000a.410b.ce80
Designated port id is 128.2, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 70, received 0version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname switch2
!
!
ip subnet-zero
!
spanning-tree extend system-id
!
!
!
interface GigabitEthernet0/1
switchport trunk encapsulation isl
switchport mode trunk
no ip address
!
interface GigabitEthernet0/2
switchport trunk encapsulation isl
switchport mode trunk
no ip address
VLAN100 is executing the ieee compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 100, address =
000a.410b.d200
Configured hello time 2, max age 20, forward delay 15
We are the root of the spanning tree
Topology change flag not set, detected flag not set
Number of topology changes 1 last change occurred 00:06:29 ago
from GigabitEthernet0/1
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15=20
Timers: hello 1, topology change 0, notification 0, aging 300
=20
Port 1 (GigabitEthernet0/1) of VLAN100 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.1.
Designated root has priority 32868, address 000a.410b.d200
Designated bridge has priority 32868, address 000a.410b.d200
Designated port id is 128.1, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 209, received 0
=20
Port 2 (GigabitEthernet0/2) of VLAN100 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.2.
Designated root has priority 32868, address 000a.410b.d200
Designated bridge has priority 32868, address 000a.410b.d200
Designated port id is 128.2, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 209, received 0
=20
=20
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