Could you send a config for both switches? How about a
fuller show spantree? A show port on the two ports?
Maybe this is caused by some half-duplex, full-duplex
issue... though I can't rationalize that explanation.
The fact that one port shows the switch as being the
root bridge and the other port pointing outwards is
getting me.
Also, who is MAC 0050.50E2.42C0?
Michael
--- Pierre-Alex <[EMAIL PROTECTED]> wrote:
> Or I am really dumb....
>
> I have two switches a Cisco 2924XL-EN and a Cisco
> 1912-EN. I have setup port
> A and port B of the 1912 swictch to do ISL trunking
> with the 2924XL
>
> This situation should have created a loop and the
> Spanning Tree protocol
> should have disabled port B.( I have setup the
> 2924XL to be the root).
> Instead I am getting the
>
> following output, with both port A and B in the
> fowarding mode (see below)
> So either the Spanning Tree protocol did not do its
> job (with due respect to
> its creator),
>
> or the trunking ports are not part of the spanning
> tree calculation, or I am
> really dumb and I missed something in the story ....
>
> Any comment?
>
>
>
> DISL state: On, Trunking: On, Encapsulation type:
> ISL
> C1912#sh trunk b
> DISL state: On, Trunking: On, Encapsulation type:
> ISL
>
> Port FastEthernet 0/26 of VLAN1 is Forwarding
> Port path cost 10, Port priority 128
> Designated root has priority 32768, address
> 0050.3EF0.3580
> Designated bridge has priority 32768, address
> 0050.3EF0.3580
> Designated port is 22, path cost 0
> Timers: message age 20, forward delay 15, hold 1
> --More--
> Port FastEthernet 0/27 of VLAN1 is Forwarding
> Port path cost 10, Port priority 128
> Designated root has priority 32768, address
> 0050.3EF0.3580
> Designated bridge has priority 32768, address
> 0050.50E2.42C0
> Designated port is 27, path cost 10
> Timers: message age 20, forward delay 15, hold 1
>
>
> Pierre-Alex
>
>
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