[cisco-voip] MRA failover doesn't work, Cisco TAC agrees, says it's a documentation defect

[Matthew Huff]

We don’t use Jabber nor Webex.

Cisco TAC has been escalated and they have been working on this for over 2 months. I have sent repeated expressway and PRT logs from the phone. After working with Cisco engineering, the claim it is “working as intended” and plan on updating the documentation to reflect the limitation that if you loose both the subscriber and redundant expressway-C server, failover won’t happen.

I’d love to be proven wrong since we may have to completely replace our solution.


From: Kent Roberts <dvxkid at gmail.com>
Sent: Tuesday, June 21, 2022 10:09 AM
To: Matthew Huff <mhuff at ox.com>
Cc: cisco-voip voyp list <cisco-voip at puck.nether.net>
Subject: Re: [cisco-voip] MRA failover doesn't work, Cisco TAC agrees, says it's a documentation defect

This sound more like a config issue…

Have run into issues where expressways go stupid when boxes go offline

As for it being the phones 88xx. Does the same happen with jabber or webex?    If it does i’d  requeue the case….

Kent


On Jun 21, 2022, at 07:47, Matthew Huff <mhuff at ox.com<mailto:mhuff at ox.com>> wrote:

We have a fairly common and standard deployment for our MRA solution. All are running CUCM 14+, latest Expressway, etc…

Vmware server 1 (jn DMZ)
  ExpressWay-E-1

Vmware server 2 (in DMZ)
   ExpressWay-E-2

Vmware Server 3 (In Core)
  CUCM Publisher
   Expressway-C-1

VMWare Server 4( In Core)
   CUCM Subscriber
   Expressway-C-2



  1.  If ether Expreway-E VMs fail, redundancy works fine
  2.  If either CUCM fails, redundancy works fine
  3.  If either Expressway-C VMs fail, redundancy works fine
  4.  If VMWare Server 4 fails (say during patching, hardware maintenance or hardware failure), redundancy fails. Remote phones un-register and never register no matter what is done. If either CUCM Subscriber or Expressway-C-2 is brought back online, phones register.

Cisco TAC claims that this is a limitation of our Cisco 88xx SIP MRA phones and is not solvable unless we purchase two new vmware servers and split the CUCM and Expressway-C into separate servers so they both won’t go down at once. Sinc VMWare Server 3 & 4 are at different locations, vMotion isn’t an option since there is no shared storage.

Anyone run into this or have any suggestions? We have engaged our VAR and cisco rep and may have to replace our phone system since we are all working from home and MRA support including redundancy is critical to us.



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