Redundancy over WAN

[Maheshwar Tayal]

Do Cisco expressway C and E  support redunancy over WAN (Across data center) for increasing capacity as well as failover scenerios.

thanks

[Jens Didriksen]

Yes, they do, however the absolute maximum round trip delay between the peers must be 30ms - the lower the better. Each peer should also use the same NTP server.

/jens

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[Wayne DeNardi]

The Expressway-Edge and Expressway-Core is the same software as the VCS-Expressway and VCS-Control, just pacakaged for CUCM registered endpoints - so the same principles apply.

As Jens mentioned, each peer in a cluster needs to be within a 15ms hop (30ms round trip delay) of each and every other VCS in the cluster.

This is mentioned in the Prerequisites section of the Cluster Creation and Maintenance Deployment Guide (4th dot point on Page 5).

Wayne
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[Maheshwar Tayal]

Thanks!

Have another Question related to same , Do Telepresence Conductor and MSE Chassis with 8710 blades also supported over WAN for clustering.

[Jens Didriksen]

Don't know about the MSE Chassis with 8710 blades, but the Conductor does - again the max round trip delay of 30ms between peers applies.

/jens

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[Patrick Sparkman]

I believe the MSE 8000 blades cluster over the chassis's backplane, and not via the network like the other servers in question.