Zyxel XGS3700-48 [8/9] Stacking role election

ZyXEL Communication Crop, 7

The main propose is to understand how stacking role election works. Also to ensure

8 switches are able to function as one logical switch with selected features.

The “Switch 1” to “Switch 4” are using XGS3700-48HP. “Switch 5” to “Switch 8” are

using XGS3700-24.

Force master enable on “Switch 1” to function as master role and “switch 2” function

as backup role in this case.

8 switches are interconnected as a ring.

3.2.1 Stacking Role Election

Master role is acting as main stacking controller. The main function for stacking

master is to process all the control packets, operation and also to maintain the

configuration file.

There are two modes to elect master role, first is “force master mode” and the

second is “auto mode”; with auto mode, master role will be elected automatically.

The “auto mode” election priority will be “force masterpriority number

(0-63)system uptimeMAC address” (from high to low)

“Force master mode” has highest priority; administrator can enable the master role

on selected switches.

Priority number has default value of 32, and the highest number is 63, by manually

assign the priority number on switches could also decide the master role.

If multiple switches have enabled “force master mode” with same priority. The

switch will compare with system up time and MAC address. Keep in mind, the

election priority is “force masterpriority number (0-63)system uptimeMAC

address” (from high to low)

In this test scenario, “Switch 1” is configured as master with “force master enable”.

When turn off “switch 1”, “Switch 2” will take over master role within 10 seconds. 3

to 5 ping lost are expected for LACP convergence.

When turn on “Switch 1” again, “Switch 1” will take over the master role due to its