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Catalyst 3750 Switches

Unanswered Question

I have 6 Catalyst 3750 switches in stacked configuration running IOS version 12.1(19) EA1.


I need to know if EtherChannel can be configured between ports from different switches. It took the configuration, For example, here is the config



interface Port-channel1

switchport trunk encapsulation isl

switchport trunk allowed vlan 2-4,9,254

switchport mode trunk

no ip addres


interface GigabitEthernet1/0/1

switchport trunk encapsulation isl

switchport trunk allowed vlan 2-4,9,254

switchport mode trunk

no ip address

channel-group 1 mode on


interface GigabitEthernet2/0/1

switchport trunk encapsulation isl

switchport trunk allowed vlan 2-4,9,254

switchport mode trunk

no ip address

shutdown

channel-group 1 mode on,


-----------------------------------------------


Now, observe the Spanning Tree outputs on port-channel, gig 1/0/1, and 2/0/1


show spanning-tree interface port-channel 1


Vlan Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------

VLAN0002 Root FWD 3 128.472 P2p

VLAN0003 Root FWD 3 128.472 P2p

VLAN0004 Root FWD 3 128.472 P2p

VLAN0009 Root FWD 3 128.472 P2p

VLAN0254 Root FWD 3 128.472 P2p


show spanning-tree interface gigabitEthernet 1/0/1


Vlan Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------

VLAN0002 Root FWD 3 128.472 P2p

VLAN0003 Root FWD 3 128.472 P2p

VLAN0004 Root FWD 3 128.472 P2p

VLAN0009 Root FWD 3 128.472 P2p

VLAN0254 Root FWD 3 128.472 P2p


show spanning-tree interface gigabitEthernet 2/0/1

no spanning tree info available for GigabitEthernet2/0/1


Why int gig 2/0/1 wouldn't give any info on spanning-tree. Really Wierd.


Any idea?


Thanks,

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skarundi Fri, 01/16/2004 - 06:43
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oh, gig2/0/1 is not providing any STP info because it is shutdown. At least that is what is shown in the output you submitted.

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