Hi everybody
Let say we have three EX 4200 switches: SW1, SW2,SW3, we want to use " Dynamic Installation method" to configure them in a chasis mode.
We cable VCP ports in daaisy chained ring toplogy. We set up SW1 and SW2 priority as 255, while SW3 has a default priority of 128.
We power SW1 first then SW2 and finally SW3. They assume following roles:
SW1--Elected master
SW2--Back up RE
SW3--Line card
Let say we power down SW1, Sw2 assume master and SW3 BACK UP RE role now, next we power on SW1. What role SW1 ,SW2 and SW3 assume ?
MASTER ELECTION CRITERIA:
The algorithm proceeds from the top condition downward until the stated condition is satisfied:
- Choose the member with the highest user-configured mastership priority (255 is the highest possible value). A switch with a mastership priority of 0 will always stay in the linecard role.
- Choose the member that was master the last time the Virtual Chassis configuration booted.
- Choose the member that has been included in the Virtual Chassis configuration for the longest period of time. (For this to be a deciding factor, there has to be a minimum time lapse of 1 minute between the power-ons of the individual interconnected member switches.)
- Choose the member with the lowest MAC address.
This is my hunch based on the above:
When SW1 powers up and join the Chasis, SW3 will assume LINE CARD ROLE because it has the lowest priority of 128.
SW1 and SW2 have the same priority of 255 so 2nd criteria is used i.e who has the more time in the chasis, since SW1 just joins Chasis therefore SW2 remains Master and SW1 assumes BACK UP RE role.
Am I correct?
Thanks and have a nice weekend!!