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How Does a Ring Stack Prevent Loops?

MIBS, SMMPv1, SMMPv2, SMMPv3 and management

How Does a Ring Stack Prevent Loops?

Postby hone » Tue Jan 24, 2017 6:05 pm

In a ring stack system, ports connected by a certain stack cable are blocked to prevent loops. Counting from the stack port with a greater stack ID on the master switch, this cable is the one numbered (n/2)+1. Here, n is the number of switches in the stack system. If n/2 is not an integer, use the integer portion.

For example, a ring stack consists of four switches.
In this scenario, n = 4, and (n/2) + 1 = 3. Counting from Stack2 of master Switch1, and ports at both ends of the third stack cable are blocked. That is, Stack1 of Switch4 and Stack2 of Switch2 are blocked.
hone
Cisco Catalyst 3560
 
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