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Hall of Fame Super Silver

IPCC Express HA accross WAN

Is it supported to have IPCCX HA servers split accross WAN? From SRND:

"The CRS Engines and Databases components must be co-located in the same building with the

CallManager servers running the CTI Managers with which IPCC Express will be communicating.

Other CallManager nodes within the same CallManager cluster (if this is a CallManager cluster split

over the WAN) can be located on other VLANs."

If I have a CCM subsriber accross WAN can I have the HA CRS server at that location as well?

Chris

8 REPLIES
Community Member

Re: IPCC Express HA accross WAN

HA over a WAN is not supported yet, AFAIK. I believe I saw it on a slide preso from Cisco to be included in 4.1 or 4.2 release...

- Bill

- Bill
Hall of Fame Super Silver

Re: IPCC Express HA accross WAN

Thanks Bill. Is it supported over 10 Mb link?

Chris

Community Member

Re: IPCC Express HA accross WAN

HA is technically possible over the WAN as long as you have a fast enough pipe. As of 4.0.3 it still isn't officially supported by Cisco, but we are attempting to connect over an OC-3 and believe the latency to be within the thresholds. If we are successful, I will repost.

-Sami

Community Member

Re: IPCC Express HA accross WAN

Has anyone successfully implemented HA over a WAN connection? My two data centers are connected via a Gigabit Ethernet, but the servers will not be on the same subnet. The routing between the two data centers are handled by Cat6K switches with Sup720s.

My impression from Cisco is that they want the servers on the same subnet, no layer 3.

Also, does anyone know if this will be changing anytime soon, like version 4.5?

Thanks,

Tom.

Community Member

Re: IPCC Express HA accross WAN

I currently have the same scenario and want to deploy IPCC Express, does anyone have any news?

What can a partner propose as a solution?

What is the Bandwidth required for the link if replication will happen across the link?

Regards,

Claudio.

Blue

Re: IPCC Express HA accross WAN

The information I have received from the BU is that at this point in time, its not supported to have the HA servers remove from each other no matterm the bandwidth. Whether this is 10MB, Gigaman, OC-48, etc. The HA servers are required to be on the same LAN. Its on the horizon and Cisco is working hard to provide the requirement to have a split HA IPCC server.

adigna - berbee

Community Member

Re: IPCC Express HA accross WAN

So going back to my initial post, we had planned to locate the HA servers across an OC-3 with low latency, and do believe it is still possible. Unfortunately, last minute changes in the project stopped us from executing this in production. Again, Cisco unofficially recognizes it is POSSIBLE, but they will not help in any capacity to its function (including TAC). At any rate, if your call center is a critical function of your business, I would not recommend this course of action.

If you decide to attempt this, your biggest challenge will be handling the heartbeat that exists between the HA servers. I believe after 3 consecutive timeouts (verify this part) the servers failover and then it gets messy (disjoint master election of services, DB records incremented independently per server, etc.)

HA is dependent on a very low latency tolerance, thus requiring a very high speed connection (think OC-3 min.) in order for this to be possible.

My source for this information comes from our team that has spoken with SE specialists from Cisco HQ regarding the IPCC HA configurations in their lab.

I'm not one to shoot down ideas, but IMHO, it's probably best to just wait for Cisco to release a supported version.

Community Member

Re: IPCC Express HA accross WAN

Yeehaw CCIE-V! Congratulatins Andrew!

I would definitely agree with your assignment. We have a Gigaman between two sites, but we decided not to risk the possibility of problems.

I think Cisco really did a great job with HA. It will be even better when they provide HA over the WAN.

I sure wish they would provide HA and Expansion server support for the Callmanager +5.0 version sooner than IPCCX 7.0 in 2008 :-(

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