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New Member

Connect a Server Cluster on 2 Cat. 3550

i have two catalyst 3550 EMI.

now, i would connect a sun cluster on on these redundant catalyst.

what is the best way to do this?

on the catalyst i use HSRP and STP.

what`s happen, if the primary interface from the cluster goes down and the

backupinterface takes the funktion and is connected to the backup switch?

the primary switch is root for stp.

New Member

Re: Connect a Server Cluster on 2 Cat. 3550

The Spanning Tree Protocol takes care of the situation where you have more than one links between two switches, a topology necessry for redundancy but one which is highly prone to broadcast storm. HSRP on the other hand helps you build redundancy into your network by allowing multiple gateways, all of which respond to the same virtual gateway address.

The best place to understand HSRP on 3550 is the document "Understanding and Troubleshooting HSRP Problems in Catalyst Switch Networks". this document is available at the following URL:

Another document that will help is 'Configuring HSRP on Cisco Catalyst 3550 series switches'.

To learn more about STP, the document 'Understanding and Configuring Spanning Tree Protocol (STP) on Catalyst Switches' will be helpful. (URL:

This document talks about what HSRP is and how it can be configured on the Catalyst 3550 series switches

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