[cisco-voip] Standby publisher

Thu Jul 1 12:40:13 EDT 2010

Kind of like Active Directory has multiple master? Would be a PERS request via their Cisco AM.

Sent from my HTC ECO 4G.

----- Reply message -----
From: "Ahmed Elnagar" <ahmed_elnagar at rayacorp.com>
Date: Thu, Jul 1, 2010 9:10 am
Subject: [cisco-voip] Standby publisher
To: "Bill" <bill at hitechconnection.net>
Cc: "cisco-voip at puck.nether.net" <cisco-voip at puck.nether.net>

No the issue is some customers "especially call centers and service providers" almost have daily changes and add on...they cannot withstand the time that a Publisher is down...we need another server in the cluster that replicates that DB real time for CUCM Publisher and it can act as a Publisher in the event that the "primary" Publisher fail.

 Best Regards;
  Ahmed Elnagar
  Senior Network PS Engineer
  Mob: +2019-0016211
  CCIE#24697 (Voice)

-----Original Message-----
From: Bill [mailto:bill at hitechconnection.net]
Sent: Thursday, July 01, 2010 5:18 PM
To: Ahmed Elnagar; 'Ryan Ratliff'
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Standby publisherpublisher. This changes a bit in6.x where the "user facing features" are written on each node,and replicated out to other nodes in realtime. This is what lets youset and clear CFA with the pub down in later versions.

Yes it's called a subscriber. :)

Like the other person that responded said you are adding another level of
redundancy to an already redundant system.

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ahmed Elnagar
Sent: Thursday, July 01, 2010 9:02 AM
To: Ryan Ratliff
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Standby publisherpublisher. This changes a bit
in6.x where the "user facing features" are written on each node,and
replicated out to other nodes in realtime. This is what lets youset and
clear CFA with the pub down in later versions.

Ryan;

Do Cisco has any plans for a "Backup Publisher" I have this discussion with
customers since the 4.x train till now.

 Best Regards;
  Ahmed Elnagar
  Senior Network PS Engineer
  Mob: +2019-0016211
  CCIE#24697 (Voice)

-----Original Message-----
From: Ryan Ratliff [mailto:rratliff at cisco.com]
Sent: Thursday, July 01, 2010 4:28 PM
To: Bill
Cc: Ahmed Elnagar; 'Andrius Kislas'; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Standby publisherpublisher. This changes a bit in
6.x where the "user facing features" are written on each node, and
replicated out to other nodes in realtime. This is what lets you set and
clear CFA with the pub down in later versions.

No you can't.  All database changes can only be made to the publisher.  This
changes a bit in 6.x where the "user facing features" are written on each
node, and replicated out to other nodes in realtime.  This is what lets you
set and clear CFA with the pub down in later versions.

See
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/rel_notes/6_0_1/cucm-rel_
note-601a.html#wp44437 for specfics.

Having a standby publisher installed and ready for restore is not a bad idea
but you will be restricted by licensing (P1 TAC SR with the licensing team
should get you rehosted pretty quickly I hope).  The only thing to worry
about wrt to IP address is if the pub is specified in System->Server by IP
address this would cause problems after the restore.   This could be avoided
simply by changing the IP address to match the failed publisher before
starting the restore.

-Ryan

On Jul 1, 2010, at 9:18 AM, Bill wrote:

Also, at least in the 4.x days, you can still make changes to the subscriber
if the publisher is down.

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ahmed Elnagar
Sent: Thursday, July 01, 2010 7:43 AM
To: Andrius Kislas
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Standby publisher

What about the license? The license relates to the MAC address of the
server??

 Best Regards;
  Ahmed Elnagar
  Senior Network PS Engineer
  Mob: +2019-0016211
 CCIE#24697 (Voice)

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Andrius Kislas
Sent: Thursday, July 01, 2010 1:17 PM
To: Cisco Voip
Subject: [cisco-voip] Standby publisher

Hi All.

Correct me if I am wrong, but when the publisher fails the biggest impact we
have is not being able to change configuration. In large environments this
might be serious impact.

My question is - does anybody use a standby/cold publisher that has the only
task - sit and wait until the primary publisher fails? This standby
published would ba standalone (not a member of existing cluster), would have
different IP address (in the same subnet) and the same name as existing
publisher, would have no licenses uploaded and would be kept in the same
version as primary publisher. During primary publisher failure we would need
to change IP address and perform disaster recovery. This would save us some
time that we would typiacly need to get new server, install new publisher,
upgrade it and finally perform recovery.

Does it sound fine or are there any caveats for such approach?

Regards,
Andrius

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