C9300 switches stack master election

[dzbanek]

Hi Meraki folks,

do you know how C9300 switches behaves in stack master election?

In standard Meraki switches manual election is not possible but how with C9300?

Do you have any URL to documentation? Thank You in advance 

[alemabrahao]

Running Meraki firmware the same is valid as for MS. Otherwise (running IOS-XE) it is the same process as for other catalyst switches.

[alemabrahao]

https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9000/nb-06-cat-9k-stack-wp-cte-e...

[alemabrahao]

the document is for the 3750-x but the same is valid for the C9300 running IOS.

Master Switch Election

The  stack behaves as a single switching unit that is managed by a master  switch elected from one of the member switches. The master switch  automatically creates and updates all the switching and optional routing  tables. Any member of the stack can become the master switch. Upon  installation, or reboot of the entire stack, an election process occurs  among the switches in the stack. There is a hierarchy of selection  criteria for the election.

1. User priority - The network manager can select a switch to be master.

2. Hardware and software priority  - This will default to the unit with the most extensive feature set.  The Cisco Catalyst 3750 IP Services (IPS) image has the highest  priority, followed by Cisco Catalyst 3750 switches with IP Base Software  Image (IPB).

Catalyst  3750-E and Catalyst 3750-X run the Universal Image. The feature set on  the universal image is determined by the purchased license. The "show  version" command will list operating license level for each switch  member in the stack.

3. Default configuration - If a switch has preexisting configuration information, it will take precedence over switches that have not been configured.

4. Uptime - The switch that has been running the longest is selected.

5. MAC address - Each switch reports its MAC address to all its neighbors for comparison. The switch with the lowest MAC address is selected

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/c...

[alemabrahao]

https://documentation.meraki.com/MS/Stacking/Switch_Stacks#Understanding_how_the_Active_Stack_Member...

Understanding how the Active Stack Member is Elected

• If all stack members are powered up around the same time, the MS with the lowest MAC address will be elected the Active switch.
• If the stack members are not powered up around the same time, the MS with the highest uptime will be elected the Active switch, regardless of its MAC address.
• The Active switch will remain the Active switch until it's either rebooted or an event occurs that forces another Active switch election (such as stack ports being reconnected).

[BrentB]

In the non-Meraki managed stack I can set the switch priority so that the same switch is always the master and there is a pecking order for if that switch goes off line. Does the Meraki Managed flavor have that same capability?

Brent

[alemabrahao]

Unfortunately not 😕

[dzbanek]

thank you, what not sure

[alemabrahao]

Do you still have questions about the process?