UCCX 7.0 High Availability IP Addressing

Answered Question
Jun 28th, 2010

Hi,

I am installing UCCX in HA mode. The servers are on the same site and have a RTT of less than 2 ms.

I am wondering whether to put them in the same VLAN or in separate VLANs. The design guide does not seem to state a preference.

Please let me know what approach works for you

I have this problem too.
0 votes
Correct Answer by Aaron Harrison about 6 years 5 months ago

Hi James

A LAN to me, is a LAN - if it's a routed LAN, it's a LAN.

Reasons for UCCX7 to be on a LAN are:

1 - It doesn't play nice if the servers are split; you may get a messy active/active scenario requiring a reboot

2 - It doesn't tolerate delays/comms issues well

These types of problems are equally likely to show up on a flat LAN as a routed one.

I have several customers with routing between the servers, and no problems. The only thing that differs is the usualy Windows behaviour of falling back to broadcast name resolution if DNS/WINS isn't there doesn't work, so it's even more important to ensure that your hosts and lmhosts (not lmhosts.sam) contain the servers names/IPs - if not you find the datastores won't activate.

Regards

Aaron

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (4 ratings)
Loading.
Anthony Holloway Mon, 06/28/2010 - 06:22

I think that: "on the same LAN", means that you cannot put them in different VLANS.

However, I wouldn't dismiss your solution that easily.  If you are confident in your network design, and can keep the delay down and the bandwith up, I'd say, pilot it for a few weeks, and if things don't pan out, move it back to the Primary's VLAN.

I may, or may not, have deployed UCCX HA over a 10GB metro ethernet before...

James Hawkins Mon, 06/28/2010 - 09:53

Thanks Anthony,

The reason why I would like to put them in different subnets is to support a possible future move to UCCX8 with the servers at different locations.

Unfortunately the customer is risk averse and is not willing to run UCCX 8.0 so I have to install 7.0 and want to make things easy for myself when we come to upgrade.

The system will be mission critical so I cannot afford to have it not working properly - can anyone provide the official line from Cisco as to whether putting the UCCX 7.0 servers in different subnets is supported?

Thanks

Walter Solano Mon, 06/28/2010 - 10:05

Hello James,

As you mention HA over IP WAN its just support under UCCX 8.0, for now UCCX 7.0 does not support these. That infomation can be check in the SRND.

http://www.cisco.com/en/US/docs/voice_ip_comm/cust_contact/contact_center/crs/express_7_0/design/guide/uccx70srnd.pdf

Page 66 says:

"Cisco Unified CCX high availability requires that the Cisco Unified CCX Engine and Database components and the CTI Managers with which the Cisco Unified CCX servers communicate be located in the same campus LAN and that the maximum round-trip delay between these servers be less than 2 ms"

HTH

Please rate this post if was helpful

Walter Solano

CCVP, Cisco UCCX Specialist

Cisco IP Communications Express Specialist

Correct Answer
Aaron Harrison Tue, 06/29/2010 - 01:06

Hi James

A LAN to me, is a LAN - if it's a routed LAN, it's a LAN.

Reasons for UCCX7 to be on a LAN are:

1 - It doesn't play nice if the servers are split; you may get a messy active/active scenario requiring a reboot

2 - It doesn't tolerate delays/comms issues well

These types of problems are equally likely to show up on a flat LAN as a routed one.

I have several customers with routing between the servers, and no problems. The only thing that differs is the usualy Windows behaviour of falling back to broadcast name resolution if DNS/WINS isn't there doesn't work, so it's even more important to ensure that your hosts and lmhosts (not lmhosts.sam) contain the servers names/IPs - if not you find the datastores won't activate.

Regards

Aaron

Actions

This Discussion