Hi all, I have a question about Cisco Catalyst 3500XL switch with Gigastack in Spanning Tree, and I hope someone can help me. I have a network like this:
[Root] SW1 ----- Gigastack (1)------ SW2 |----------Gigastack (2) -----x--| I have 2 Cat.3500XL switches and use 2 gigastack cable to connect them. It work fine and I found that the LED on Gigastack (1) is green while the SW2-Gigastack (2) is in amber. I assume that the port on SW2-Gigastack (2) is spanning tree blocking. Now, I want to install one more Cat.3500XL switch. Then I disconnect the cable SW2-Gigastack (2). However, I found that the network connection between the two switches are broken for about 50sec. I think it is due to spanning tree re-learning. Then I install a new Cat.3500XL (SW3) into the stack. [Root] SW1 ----- Gigastack (1)------ SW2 | |----------Gigastack (2) -----SW3 However, I found that the network connection between SW1 and SW2 was broken again for about 50 sec. The spanning tree re-learn again! My questions are: 1. Why is the spanning tree re-learn if I just disconnect the blocking link at SW2-gigastack (2)? 2. Why is the spanning tree re-learn if I install a new switch? (I am sure SW1 is still the root bridge) 3. I want to enable spanning portfast on all of the gigastack port. However, I wonder will it cause network loop if I connect the SW2 and SW3 with Gigastack? 4. As the SW3 is on loan, I need to replace it after several months. Is that means, the network connection between SW1 and SW2 will be interrupt again? Please help! Thanks, Dovelet Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=51450&t=51450 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
