cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
146
Views
0
Helpful
2
Replies

802.1s problem on 6509

alexteng
Beginner
Beginner

I had 2 cat6509 with 2 SUP720 and 2 2950 switch,

and my setting is:

crate vlan10 & vlan20 on 2 6509,connect one 2950 switch on Gi2/1(I use command "switchport access vlan 10") and Gi2/2 for another(swicthport access vlan 20)

Gi2/3 & Gi2/4 is EtherChannel to connect another 6509.

about spaining tree,I use "spaining-tree mode mst" on 6509 and I also use this command in 2 2950 switch

fastethernet port use spaining-tree portfast command,but I got a problem,when I disconnect EtherChannel link on cat6509,one 6509 switch's vlan 20 always done,and Gi2/2 spaining tree status is block,why??

2 REPLIES 2

Georg Pauwen
VIP Master VIP Master
VIP Master

Hello,

what are the VLAN STP priorities for you VLANs ? Which switch is the root switch for which VLAN ? In general, when a port is blocked there is another one forwarding for the same VLAN. Can you post the configuration of your switches ?

Regards,

GP

sorry,my STP priority setting is:

spaining-tree mst 0 priority 4096(this is 6509-A)

spaining-tree mst 0 priority 8192(this is 6509-B)

two 2950 switch is not set priority so it is 32768,

normally,the spaining tree will blocked Gi0/2(connect to 6509-B),when I disconnect EtherChannel,it should be forwarding status for all link,right?I can see all switch port LED is green,but when I show vlan,the vlan 20 is down,and when show spaining-tree,6509-B's Gi2/2 is blocked,would you provide any experience to me?thank you

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: