From: chrisa (chris_atkins@blueyonder.co.uk)
Date: Mon Dec 16 2002 - 14:09:11 GMT-3
Sorry diagram did not come out.
sw1 ------------------- :sw2
sw1--------------------sw2
isl trunk vlan 1 &100 on both connections.
----- Original Message -----
From: "chrisa" <chris_atkins@blueyonder.co.uk>
To: <ccielab@groupstudy.com>
Sent: Monday, December 16, 2002 4:53 PM
Subject: spanning tree help please.
> 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
>
> [GroupStudy.com removed an attachment of type image/gif which had a name
of clip_image001.gif]
> .
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