Mediation server DNS load balancing with Avaya IP-PBX

Dear team,
There's a customer having a total Avaya Solution as their PABX solution. Also, the client does have Lync Server 2010 Enterprise environment with 2x FE servers (Mediation Service collocated)
and is looking for the option of integrating the Lync with their Avaya using 'Avaya CM SIP Enablement Services' which is mentioned in the 'Supported lP-PBX' list.
In terms of load balancing, currently, I have the 2 FE servers in the pool collocated with mediation role under DNS load balancing. I would like to know whether
it is possible to have the integration in such a load balancing way from Lync's point, without having to use a standalone or HLB device?
*Want to know if one FE goes down, the mediation services will be used the second FE server
by the Avaya system?*
Thank you,
Cheers..

HI
Multiple mediation servers connecting to the same PSTN gateway or SIP trunk required redundant DNS A records pointing to the same IP to fool the Topology Builder. Lync 2013 supports M-N
trunk routing. This allows for multiple trunks pointing to different gateways as well as for gateways with multiple trunks for different Mediation Servers.
After First Server will went down it might take some to go Second Server.
Regards
Zahoor hakeem | U C Solution Architect|

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Hi Edurojma,
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Kind regards
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DNS load balancing for Enterprise serevrs

Hi All
In my test Lync 2010 Enterprise environments, recently i have implemented the DNS load balancing with webservices
My environment is two lync 2010 ent servers , 1 SQL server, 1 Monitoring + Archive server (Same Box)
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PLEASE NOTE: NO HARDWARE LOAD BALANCING IN MY SETUP
Create a Host record for the Pool name with respective front end servers
Pool name : Pool2.doitnow.com with 2 lync 2010 enterprise servers named lyncfe01n.doitnow.com (192.168.1.5) and lyncfe02.doitnow.com (192.168.1.6)
Two host A records in DNS as POOl2 with IP of 192.168.15 and 192.168.1.6
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5. Type the pool FQDN that resolves to the physical IP addresses of the servers in the pool. in
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6. Below External web services, type the external pool FQDN that resolves to the virtual IP addresses of the pool, and then click
OK. ((my case it is Pool2.doitnow.com ) - is that REQUIRED ?
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Actions pane, click Publish Topology.
IS THERE ANY THING TO BE DONE APART fROM ABOVE POINTS
Now
what i did is. in lyncfe01n.doitnow.com - i have disabled the network card and try to login lync 2010 client , but not succeesfull
my assumption is, it should work via lyncfe02.doitnow.com, since load balanace in DNS is in already in place
do i need to open / firewall rule to be creany port in second lync server
here is the below seqeunce of event viwer from lync
Log Name:      Lync Server
Source:        LS User Services
Date:          1/14/2014 3:34:31 PM
Event ID:      32108
Task Category: (1006)
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      lyncfe01n.doitnow.com
Description:
Pool Manager changed state of Registrar with FQDN: lyncfe02.doitnow.com to Inactive.
======
Log Name:      Lync Server
Source:        LS User Services
Date:          1/14/2014 3:35:01 PM
Event ID:      32109
Task Category: (1006)
Level:         Information
Keywords:      Classic
User:          N/A
Computer:      lyncfe01n.doitnow.com
Description:
Pool Manager changed state of Registrar with FQDN: lyncfe02.doitnow.com to Active
====
Log Name:      Lync Server
Source:        LS Routing Data Sync Agent
Date:          1/14/2014 3:50:58 PM
Event ID:      48003
Task Category: (1058)
Level:         Information
Keywords:      Classic
User:          N/A
Computer:      lyncfe01n.doitnow.com
Description:
The Routing Data Sync Agent has initiated a sync cycle with: [pool2.doitnow.com]
=====
Log Name:      Lync Server
Source:        LS User Services
Date:          1/14/2014 3:56:21 PM
Event ID:      32108
Task Category: (1006)
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      lyncfe01n.doitnow.com
Description:
Pool Manager changed state of Registrar with FQDN: lyncfe02.doitnow.com to Inactive.
===============
Log Name:      Lync Server
Source:        LS File Transfer Agent Service
Date:          1/14/2014 3:56:45 PM
Event ID:      1008
Task Category: (1121)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      lyncfe01n.doitnow.com
Description:
Failed to read Central Management database information from AD connection point. Microsoft Lync Server 2010, File Transfer Agent will continuously attempt to retrieve this information.
While this condition persists, configuration changes will not be delivered to replica machines.
Exception:
Microsoft.Rtc.Management.ADConnect.ADTransientException: Active Directory error "-2147016646" occurred while searching for domain controllers in domain "doitnow.com": "The server is not operational.
Name: "doitnow.com"
" ---> System.DirectoryServices.ActiveDirectory.ActiveDirectoryServerDownException: The server is not operational.
Name: "doitnow.com"
---> System.Runtime.InteropServices.COMException (0x8007203A): The server is not operational.
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arrayCreator, Boolean includeDeletedObjects)
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   at Microsoft.Rtc.Xds.Replication.Common.Utils.TryGetConnectionPointFromAD(String& sqlStorePath, Exception& exception)</Data>
====================
Log Name:      Lync Server
Source:        LS Master Replicator Agent Service
Date:          1/14/2014 3:56:45 PM
Event ID:      2014
Task Category: (2122)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      lyncfe01n.doitnow.com
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Failed to read Central Management database information from AD connection point. Microsoft Lync Server 2010, Master Replicator Agent will continuously attempt to retrieve this information.
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Exception:
System.ApplicationException: Domain "doitnow.com" cannot be contacted or does not exist. ---> System.DirectoryServices.ActiveDirectory.ActiveDirectoryObjectNotFoundException: The specified domain does not exist or cannot be contacted.
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===============
Log Name:      Lync Server
Source:        LS Inbound Routing
Date:          1/14/2014 3:56:46 PM
Event ID:      45005
Task Category: (1037)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      lyncfe01n.doitnow.com
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Unexpected exception occurred in the Inbound Routing Application.
======================================
Log Name:      Lync Server
Source:        LS User Services
Date:          1/14/2014 3:56:53 PM
Event ID:      30975
Task Category: (1006)
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      lyncfe01n.doitnow.com
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Encountered a connection failure while executing a request against the back-end.
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Log Name:      Lync Server
Source:        LS User Services
Date:          1/14/2014 3:56:53 PM
Event ID:      32134
Task Category: (1006)
Level:         Error
Keywords:      Classic
User:          N/A
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driver={SQL Server Native Client 10.0};Trusted_Connection=yes;AutoTranslate=no;server=sql.doitnow.com\rtc;database=rtc;
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Ensure the back-end is functioning correctly.
=================
Log Name:      Lync Server
Source:        LS User Services
Date:          1/14/2014 3:56:53 PM
Event ID:      32112
Task Category: (1006)
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      lyncfe01n.doitnow.com
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Pas with FQDN: Pool2.doitnow.com has been detected to be down.
=================
Log Name:      Lync Server
Source:        LS User Services
Date:          1/14/2014 3:56:54 PM
Event ID:      32098
Task Category: (1006)
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      lyncfe01n.doitnow.com
Description:
Failed processing conference status requests. This error might delay the freeing up of PSTN meeting ids in conference directories homed on this pool.
Error code: 0x800407D0
Cause: Possible issues with back-end or Lync Server health.
Resolution:
Ensure the Lync Server service is healthy.
===========
Log Name:      Lync Server
Source:        LS User Replicator
Date:          1/14/2014 3:58:33 PM
Event ID:      30022
Task Category: (1009)
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      lyncfe01n.doitnow.com
Description:
The connection to domain controller DC01.doitnow.com appears to have been terminated. The domain controller could have gone down. User Replicator will attempt to reconnect to an available domain controller for this domain.
=====
Log Name:      Lync Server
Source:        LS File Transfer Agent Service
Date:          1/14/2014 3:58:43 PM
Event ID:      1035
Task Category: (1121)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      lyncfe01n.doitnow.com
Description:
Failed to register with back-end database. Microsoft Lync Server 2010, File Transfer Agent will continuously attempt to reconnect to the back-end. While this condition persists, no replication will be done.
The Connection string: Data Source         = sql.doitnow.com\rtc;
                Database            = xds;
                Max Pool Size       = 5;
                Connection Timeout = 60;
                Connection Reset    = false;
                Enlist              = false;
                Integrated Security = true;
                Pooling             = true;
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   at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart)
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   at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection)
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   at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject)
   at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject)
   at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject)
   at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)
   at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
   at System.Data.SqlClient.SqlConnection.Open()
   at Microsoft.Rtc.Common.Data.DBCore.PerformSprocContextExecution(SprocContext sprocContext)]
Cause: Possible issues with back-end database.
Resolution:
Ensure the back-end is functioning correctly.
=================

Thanks Andrew.
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Cheers - Wei
Michael Yakimisky <[email protected]> wrote in message
news:[email protected]...
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string process-length 16
string operation hash-xor
protocol tcp
vip address 172.16.32.1
active
Can we change the string prefix to JSESSION instead of JSESSIONID= ?
The only place the app guys can add a constant string to match on is before the = sign.
Is it possible for CSS to match on a constant string before = sign e.g below:
service ServerA
ip address 192.168.10.2
keepalive type tcp
keepalive port 80
string id567=
active
service ServerB
ip address 192.168.20.2
keepalive type tcp
keepalive port 80
string id123=
active
content ABC
url "/*"
add service ServerA
string prefix "JSESSION"
advanced-balance cookies
port 80
add service ServerB
string skip-length 0
string process-length 6
protocol tcp
vip address 172.16.32.1
active

It should work.
There is no reason for it not to work...
This is the best method you can have on the CSS for stickyness.
Get a sniffer trace on the client and server with arrowpoint cookie configured on the CSS and capture a failure so we can see what is going on.
also send me the config so I can verify everything is ok.
If you have a service request open with the TAC, you can also give the SR # so I can review what has been done.
Gilles.

Server Side Load Balancing Testing

Hi,
Can any one tell me about any test case for server side load balancing in an 11.1.0.7 RAC?
I have a 2 nodes RAC with local_listener and remote_listener set properly (for server side load balancing). For testing, i have create a TNS at my client side which points to only one node of RAC (a single ADDRESS entry pointing to node 1 of my RAC). So, from this client, when ever i connect, it always connects me to the node 1 which i have mentioned in the TNS. Does it mean that server side load balancing works in conjunction with client side load balancing only and i should add ADDRESS entry in my TNS for the second node also? If yes, then how can i create a test case to check server side load balancing?
Thanks
Salman

Thanks Rajeysh but i already have seen these documents after "googling" about server side load balancing but these documents don't give my any idea for testing the server side load balancing. My goal is actually testing the following scenario
Creating a TNS entry to connect to a RAC database (with server side load balancing enabled) by using a single ADDRESS line in TNS which points to node1 to connect to service on node 1 (service_name is set to same value on all the nodes).
Now, if i invoke 10 SQLPLUS windows to connect to the RAC database using this TNS, it always connects me to instance 1 running on node 1, where is server side load automatic load balancing? Why new sessions are not being directed to some other instance and why every time i always connect to instance 1?
Salman

Client side load balancing and server side load balancing

Hello Team,
I need to know how to set up client and server side load balancing in oracle rac. What all things to be implemented like creating a service, tnsnames.ora settings etc.
And also if i used SCAN ip instead of VIP. how the settings will change.
Regards,

Hi,
please find here an Whitepaper with the information
http://www.oracle.com/technetwork/database/features/availability/maa-wp-11gr2-client-failover-173305.pdf
kind regards

Load Balancing with BigIP / SSL question

I have an oddball question. We're load balancing ColdFusion
MX7 across 3 servers using a BigIP load balancing server. We
decided to go the hardware approach and it has been great except
for one small configuration issue.
We use a mix of SSL and non SSL pages, prior to the switch
from a single server to a load balanced setup I used to script that
would determine if a page that was supposed to be SSL had the
variable CGI.HTTPS turned on or off. If it was off, the page would
redirect back to itself with the SSL turned on.
The problem we have is that we followed BigIP's instruction
to secure the load balancing hardware instead of the three servers
running behind it. So what happens is that the traffic goes to the
load balancer port 441, but then the calls from the load balancer
to the individual servers is port 80. So even if a page is called
as HTTPS://... the coldfusion server says that CGI.HTTPS is "off"
since the traffic is port 80.
This isn't much of a problem, our SSL pages are linked as
HTTPS:// and the only problem would actually arise if someone was
to type in the URL and call it as HTTP rather than HTTPS.
My questions is this, does anyone know of a way that I can
detect if the page should be HTTPS and is not without changing our
configuration and putting SSL certificates on each individual
server?

Hey,
Well the load balancing with the BigIP device is really very
amazing. I think
what i liked most was swapping out servers when their lease
was up, through the
BigIP manager I just stopped all traffic to a server, shut it
down, plugged in
the new one and turned traffic back on. It was really very
easy.
The SSL stuff still gives me a headache to think about. but
I should mention I
no longer work where I was, plus now I'm all .net C# but
that's a different
story.
I think if I was going to do this all again I would not have
secured the bigIP
unit. It was nice to buy one SSL cert for all the servers I
attached rather
than one per server, but getting the SSL sites to work
properly was a headache.
We also use windows file replication where now I would go
with like a pair of
Dell MD1000's mirrored for storage and just have tons of ram
and cpu on the
front end units. Depends what you want to spend I guess. I
think the bigIP unit
we bought was like 20 grand, i think they are cheaper now
though.
Hope I helped.

How does load-balancing with WebCache work - is there still a bottleneck?

Hello,
We're migrating an old Forms 6i app to 10.1.2.0.2 (apps servers = Redhat Linux), and are starting to consider using WebCache to loadbalance between two application servers.
My question is this - say we have apps servers A and B, both running Forms and Reports Services. We use Webcache on server A (don't have the luxury of a third apps server...) to load balance between A and B. So all initial requests come into A, which in some cases may then be diverted to start a new Forms session on B.
For those users whose middle-tier sessions are now running on B - will all network traffic for their Forms session continue to be routed through Webcache on A, then to B, over the course of the session? Or does Webcache somehow shunt the whole connection to be straight between the client PC and server B, for the duration of that Forms session?
If the former, does that mean that the server hosting Webcache can still be a significant bottleneck for network traffic? Have people found load-balancing with Webcache to be useful..?
Thanks in advance,
James

Hi gudnyc,
Thanks for posting on Adobe forums.
For HDPI you do not have to do any It will adjust automatically.
http://helpx.adobe.com/photoshop-elements/using/whats-new.html
Regards,
Sandeep

Load Balancing With Round Robin

Hi,
I have two iAS instances, each on their own box, and one iWS instance
running on a third box. I have setup the web connector to use round
robin and added the server weights. I believe that is all that is to it
to do simple load balancing with iAS. The problem is is that the
requests only go to one iAS instance. The server weights are 1 and 1.
Am I missing something here?
Thanks

Could be lots of things.
The most common misconfiguration is testing an application that is deployed "local". This application option effectively disables load balancing.
Another common mistake is to either not update the configuration of the webconnector (if the webconnector
has a seperate configuration LDAP) or to not restart
the webconnector after the configuration change.
Hope this helps. There's more things we could try, but I'll hope its one of these two easy things.

Getting load-balancing with distributed destination to work...

Hello,
          I try to setup a proof of concept for balancing heavy load over several JMS server instances on WLS 8.1 SP4:
          I have
          - 2 managed servers in 1 cluster plus adminserver on 1 machine (WinXP)
          - 1 JMS server on each server (no migrateable targets used), having 1 physical queue
          - 1 distributed queue deployed to the cluster, consisting of the two physical queues
          - 1 connection factory deployed to the cluster with round-robin load-balancing enabled, and server affinity disabled
          - 1 test JSP using the connection factory from above, doing a complete re-connection per test message
          - 1 MDB ejb module deployed to the cluster
          and the result is:
          1. Calling the JSP through the second server instance load-balances messages on both JMS servers, that's fine ...
          BUT
          2. Calling the JSP through the first server instance processes all messages on the first server instance's JMS server, no message is ever sent to the second server.
          What could be the reason for the different behaviour of both servers?
          extract from config.xml used:
          <Cluster
          MulticastAddress="237.0.0.1"
          Name="clusterA"/>
          <EJBComponent Name="jtest"
          Targets="clusterA"
          URI="ejb/test.jar"/>
          <WebAppComponentName="test"
          Targets="clusterA"
          URI="web/test"/>
          <JMSConnectionFactory
          JNDIName="ConnectionFactory"
          LoadBalancingEnabled="true"
          ServerAffinityEnabled="false"
          Targets="clusterA"/>
          <JMSServer
          Name="JMSServer1"
          Store="JMSFileStore1"
          Targets="server1">
          <JMSQueue
          JNDIName="TestQueue.server1"
          JNDINameReplicated="true"
          Name="TestQueue-server1"/>
          </JMSServer>
          <JMSServer
          Name="JMSServer2"
          Store="JMSFileStore3"
          Targets="server2">
          <JMSQueue
          JNDIName="TestQueue.server2"
          JNDINameReplicated="true"
          Name="TestQueue-server2"/>
          </JMSServer>
          <JMSDistributedQueue
          JNDIName="TestQueue.DD"
          Name="TestQueueDD"
          Targets="clusterA">
          <JMSDistributedQueueMember
          JMSQueue="TestQueue.server1"
          Name="TestQueue.server1Memeber"/>
          <JMSDistributedQueueMember
          JMSQueue="TestQueue.server2"
          Name="TestQueue.server2Member"/>
          </JMSDistributedQueue>
          Cheers
          Martin

Ok solved, it works as expected, when running on two solaris hosts

Mediation server DNS load balancing with Avaya IP-PBX

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