04-03-2012 04:00 AM - edited 03-14-2019 09:38 AM
Hi guys,
Does anyone know what will happen with CCX 8.5 in HA over WAN configuration goes to island mode?
So consider the following setup
Site A Site B
CUCM Node --- WAN --- CUCM Node
CCX Primary CCX Standby
Each site have their own local voice gateway and sets of agents.
The SRND covers that if 10 consecutive heartbeat is lost then a failover will be triggered.
However the SRND does not cover the scenario if the WAN is totally cut and Site A and Site B is completely isolated from each other.
Does anyone know what will happen in this situation? Will both CCX Node become Primary and operate in its own right (just like Unity Connection cluster when they go to island mode)?
Kind regards
Daniel
04-03-2012 04:07 AM
Daniel,
In UCCX's HAoWAN Island mode, both sides will be active & process calls simultaneously, as they feel the other side node is down ( as the WAN link between them is down ). This is known as Split-Brain situation in UCCE terms.
It is described nicely in the VoD available here https://communities.cisco.com/videos/4250 . Island mode description starts after 7th minute of VoD.
Hope it helps ?
GP.
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04-04-2012 10:43 AM
Daniel,
Here is more of a "step by step" to your question:
Page 68:
When the WAN link has a clean break:
and by clean break I mean it goes down and stays down, it does not
flap or provide intermittent connectivity
1) The CAD agents will connect to UCCX server that they can communicate with
2) The UCCX servers will connect to the CUCM Node that they can connect
to for call processing
3) The calls that get to the respective UCCX servers will go to the
respective agents
When the WAN Link is restored:
1) The Nodes will decide which node is more "qualified" to become the
master node, this is generally Node 1 aka the first node that was built
in the cluster
2) The CAD Agents connected to the node that becomes the secondary will
fail over to Node 1 to begin accepting calls from it
3) All of the calls that the new master Node were processing will not
have any negative affect as they will continue to be processed by UCCX
4) The calls that are in queue for the node that becomes the slave in
the cluster will be dropped
11-20-2016 05:26 AM
When in island mode are there services that are impacted? Moh, Extension Mobility, QM recordings? Thank You.
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