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<p class="MsoNormal">And the gifts keep on coming... the
registered/unknown
puzzle unraveled :)<br>
</p>
Now for the final question:<br>
<br>
How does the Call Forward Unregistered handle Unknown states? In my
case if the branch phone never registered to CM1 since the last CM
service restart its state will be unknown. Will an incoming call to
the phone DN follow the CFUR ? <br>
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<p class="MsoNormal">Sorry to pester you with questions and thank
you again.<br>
</p>
<p class="MsoNormal">PS: If you ever decide to write a book on CUCM
please sign me up on the pre-order list.<br>
PPS : somehow I don't think I am the only one.<br>
</p>
<p class="MsoNormal">Best regards,<br>
Ovidiu<br>
</p>
<br>
<br>
On 06/Apr/11 10:49 PM, Wes Sisk wrote:
<blockquote cite="mid:4D9CD1C9.2010209@cisco.com" type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
If phone is local to CM1 and registers to CM1 then CM1 sees the
phone as registered. Because the SDL link is down CM2 will see
the phone as unregistered.<br>
<br>
If phone is local to CM2 and registers to CM2 then CM2 sees the
phone as registered. Because the SDL links is down CM1 will see
the phone as unregistered.<br>
<br>
The appearance of "unregistered" vs "unknown" in the UI is a bit
of a red herring. Registration status is captured in a shared
memory segment by the ccm process. Processes such as AXL and RIS
read that shared memory segment.<br>
<br>
When AXL or web service goes to read that shared memory segment it
reads all nodes in the cluster. With connectivity to CM2 being
down AXL or RIS on CM1 will only be able to query CM1 shared
memory. If the phone in question has never registered to CM1 then
status will be "unknown". <br>
<br>
Similarly if the ccm process on CM2 restarts then the status will
be "unknown" in the CM2 shared memory segment until the first time
the phone registers with CM2.<br>
<br>
So, "unknown" vs "unregistered" has a very subtle, possibly even
nuance, different meaning. "unknown" means the shared memory
segments currently available to query have not been updated with a
known status for that device since the last ccm process restart.
"unregistered" means the phone last transitioned to "unregistered"
signaling status with one of the nodes that is currently
accessible from the AXL or RIS instance you are querying<br>
<br>
In ASCII:<br>
<tt>browser->Tomcat->RIS1->shared_memory1->CM1<br>
|->RIS2->shared_memory2->CM2<br>
</tt><tt> |->RIS3->shared_memory3->CM2<br>
</tt><br>
All contingent on IP connectivity from Tomcat to the various RIS
processes across the cluster.<br>
<br>
Regards,<br>
Wes<br>
<br>
On 4/6/2011 4:01 PM, Ovidiu Popa wrote:
<blockquote cite="mid:4D9CC681.5000506@gmail.com" type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<title></title>
Hello Wes<br>
<br>
Excellent information. I always had a difficulty understanding
the insides of the CUCM box. Thank you. <br>
<br>
One question remains:<br>
Imagine a WAN failure for 30 minutes. CM1 and CM2 are working
without the SDL layer. CM2 (branch) sees the branch phone as
Registered, CM1 (hq) sees the phone as unregistered or unknown?<br>
<br>
Thanks.<br>
Ovidiu<br>
<br>
<br>
On 06/Apr/11 9:22 PM, Wes Sisk wrote:
<blockquote cite="mid:4D9CBD7C.408@cisco.com" type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
For example sake:<br>
CM1: headquarters<br>
CM2: branch<br>
<br>
When IP connectivity exists between CM1 and CM2 SDL TCP
sessions are established between the 2 ccm processes. Through
SDL each server tells every other server about registered
devices. There is opportunity for duplicate registration and
some propagation time so there is a window of convergence
involved. Once things are in sync each CM node tells every
other node about all significant local state changes. Make
sense? This usually helps folks understand why QoS is so
critical on SDL links. SDL links are the vehicle for
synchronization for 2 real time processes. This isn't quite
as sensitive as parallel graphics processing but it's not far
off.<br>
<br>
When SDL link goes down each node forgets about all entities
it learned from the remote node. It literally purges them.
Devices have to register to their local node (even the best
network admins miss some especially when it comes to virtual
devices like hunt pilots, route lists, and software media
resources). Again there is opportunity for some duplicate
registration. SDL links detect outage on the order of 10
seconds or less. SCCP devices do keepalives on the order of
30 seconds with allowance for 1-2 missed keepalives.
10seconds vs 60-90seconds creates a window of overlap. If a
duplicate registration is detected then CM resets both device
processes. This extends downtime but there really is no way
of knowing which is the "right" registration. This is another
window of convergence.<br>
<br>
So, after convergence the device appears unregistered on the
remote node. For an interesting dig into this scenario take a
look at<br>
CSCsc62081 CCM SDL Out of Service / In Service causes
Unexpected Unity Failover.<br>
<br>
and similarly related to realtime synchronization of state
machines:<br>
CSCsc62073 Locations Out of Bandwidth causes unexpected
Unity Failover <br>
<br>
It was the same customer who originated both of these. This
customer had truly the worst luck with timing that I have ever
seen.<br>
<br>
Regards,<br>
Wes<br>
<br>
<br>
On 4/6/2011 11:51 AM, Ovidiu Popa wrote:
<blockquote
cite="mid:BANLkTimjKJr7LESdFC2B=Yt9A0mXYqm-pA@mail.gmail.com"
type="cite">Hello everyone
<div><br>
</div>
<div>Here's an unusual scenario that kind of puzzles me.</div>
<div><br>
</div>
<div>Here are the details:</div>
<div>- 2 CUCM with Clustering over WAN (HQ and Branch)</div>
<div>- Centralized PSTN Access at HQ (DID numbers routed to
HQ)</div>
<div>- 1 phone with the Branch CUCM as primary and the HW
CUCM as secondary</div>
<div><br>
</div>
<div>Disaster strikes, the WAN link goes down and we have a
split brain condition.</div>
<div><br>
</div>
<div>What is the state to the phone on HQ CUCM? Will the
phone be Unregistered or state Unknown?</div>
<div><br>
</div>
<div>And the most important question is will the HQ CUCM
follow the CFUR if the state is Unknown?</div>
<div><br>
</div>
<div>Thanks for your input.</div>
<div><br>
</div>
<div>Regards,</div>
<div>Ovidiu</div>
<div> <br>
</div>
<div><br>
</div>
<div><br>
</div>
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