[cisco-voip] Expressway Cluster failover for MRA...

[Ryan Huff]

1.) It used to be in previous versions that all cluster nodes could technically be active at any time and SRV weights and priorities could influence the path selection but not guarantee it end-to-end when all cluster nodes are up and running.

I believe this behavior has changed/improved and I think you are supposed to be able to control that now with SRV weights and priorities, but I could be wrong. I haven’t played with Expressway clustering in a bit.

2.) As far as the Jabber registration goes; what I’ve done before in the edge is have the collab-edge SRV point to the edge cluster FQDN as the target. Then I create round robin A records for the cluster FQDN (one resolving your each edge server). The for the edge certs, just make sure the edge cluster fqdn is in the SAN.

This way if one of the edge server goes down, the Jabber client is ultimately still trying to resolve the same MRA FQDN via SRV lookup (this a key to Jabber client failover for MRA). 

Thanks,

Ryan

> On Jan 28, 2020, at 20:50, Jonathan Charles <jonvoip at gmail.com> wrote:
> 
> 
> We have two pairs of Expressway clusters (C/E) at two different locations (primary and DR)...
> 
> The cluster is up, however, we want to make sure that we are in Active/Standby.
> 
> Currently, we have one of our SRV records for collab-edge set at 5 (the backup is at 10) with the same weight.
> 
> The clustering guide says we should set the priority and weight on both SRV records the same, which will cause half of the registrations to go to the DR site. It is far away and has less capability.
> 
> How do we:
> 
> 1 - Make sure the primary site handles all MRA registrations and the DR site is only used when the primary is down.
> 2 = Make sure failover occurs automatically... currently Jabber users have to log out and back in to connect to the DR site.
> 
> 
> Thanks!
> 
> 
> Jonathan 
> 
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