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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