Dual Master diagram

[kuni]

I'd like to know whether dual master can use or not.

Please see the below picture.

Thank you,

[BrechtSchamp]

Two internet connections on one MX can be used at the same time. But the second MX, the warm spare, will be passive and will not be doing any routing as long as the primary one works.

[kuni]

Thank you for your answer.

I saw dual master in the below link.

https://documentation.meraki.com/MX/Deployment_Guides/MX_Warm_Spare_-_High_Availability_Pair

Can't use dual master in the both of diagram1 and 2 ?

[cmr]

No, as @General-Zod  and @BrechtSchamp  said an MX pair is active-passive with up to two wired and one cell uplinks (depending on model).

[BrechtSchamp · Accepted solution]

Dual master is an undesired side-effect of a malfunctioning of a design. It must be avoided at all times. It's also the reason why we don't interconnect the two MX's directly anymore in an HA setup.

See also the description in the link you shared:

Dual Master: Dual Master describes a scenario in which both the Primary and the Spare are in the Active state. This occurs when both MXs are online and communicating with the cloud, but the Secondary is not receiving heartbeat packets (see VRRP heartbeats in the next section) from the Primary. This can cause several issues with Dynamic DNS, VPN, and traffic processing in general and should be avoided at all costs. The Physical Architectures section of this document describes how to deploy an MX Warm Spare pair in order to minimize the chances of a Dual Master scenario occurring.

[kuni]

Thank your for your answer.

Dual Master function is not recommendation, right ?

Recommended diagram is Active-Standby.

I understand.

Thank you,

[BrechtSchamp]

Dual Master is when it's not working correctly. The only setup is active-passive.

[Imboasalama]

Hello evryone ,

I 'm using two MX .
By default they are in master -master config .

Is there someone who can help on how to change them to Master - Ready ?

[General-Zod]

Negative, MX’s participating in HA are only active-passive, at least in the current software. The active MX can however utilise dual wans simultaneously, if applicable.

hope this helps