[cisco-voip] is all traffic endpoint initiated?
Ryan Ratliff
rratliff at cisco.com
Mon Nov 9 18:43:53 EST 2009
The most important point is that the value in system->server should
always match that of the server, whether it is IP address or
hostname. Just because you haven't configured DNS on the servers
doesn't mean the hostname in this field will break things.
-Ryan
On Nov 9, 2009, at 3:48 PM, Lelio Fulgenzi wrote:
Thanks Ryan. If I understand you correctly then:
if I simply change the value in the system > server fields, i should
change them from IP address to hostname, but
if I delete and recreate, I can use IP addresses?
I think I got that straight.
---
Lelio Fulgenzi, B.A.
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
"Bad grammar makes me [sic]" - Tshirt
----- Original Message -----
From: "Ryan Ratliff" <rratliff at cisco.com>
To: "Lelio Fulgenzi" <lelio at uoguelph.ca>
Cc: "cisco-voip voyp list" <cisco-voip at puck.nether.net>
Sent: Monday, November 9, 2009 3:45:06 PM GMT -05:00 US/Canada Eastern
Subject: Re: [cisco-voip] is all traffic endpoint initiated?
See below...
-Ryan
On Nov 9, 2009, at 11:46 AM, Lelio Fulgenzi wrote:
Thanks for your comments Ryan and Justin. They'll definitely help me
build my new cluster. Some comments/questions:
Ryan: I'm a little concerned with using hostnames and not IP address
in the System -> Server settings. Do you mean IP addresses don't match
what's on the box on the other side? In the event of a DNS failure I
don't want my phone system to go down. I understand that there will be
more and more dependancies, but I'd like to minimize them.
RR> Whenever you change the IP address of a CUCM server if the IP
address of the server does not match the processNode entry in the
database (System->Server) then the database won't start and bad things
happen. With the hostname being in System->Server then the IP address
will always match.
My recommendation was specific to the IP address change procedure,
just to make sure that everything comes up.
Ryan: I'm a little confused as to you what you mean by your last
paragraph. How can I use hostnames if I haven't configured DNS? Won't
it come back with errors?
The CUCM subscribers know the publisher's IP address because you
configure it during installation. The clustermanager serivce on each
server is responsible for connecting and updating each server's local
hosts file so that name resolution always works within the cluster,
regardless of whether DNS is configured.
Justin: I would think it would be cleaner to delete and recreate
rather than simply edit.
To all:
how many are using hostnames rather than IP addresses in the System ->
Server settings?
has anyone had to rename/delete a subscriber using Justin's suggested
method?
Thanks again....
----- Original Message -----
From: "Ryan Ratliff" <rratliff at cisco.com>
To: "Lelio Fulgenzi" <lelio at uoguelph.ca>
Cc: "cisco-voip voyp list" <cisco-voip at puck.nether.net>
Sent: Monday, October 26, 2009 10:53:19 AM GMT -05:00 US/Canada Eastern
Subject: Re: [cisco-voip] is all traffic endpoint initiated?
Don't worry about network connectivity for accessing the DMA files,
since that's going to be during the install and no services will be
running to either accept connections or initiate them.
When changing the IP address I'd highly recommend your System->Server
entries be hostnames and not IP addresses, since bad things happen
when the IP address in System->Server doesn't match the one that's
actually on the box.
You are correct that you don't have to configure DNS or NTP until
after everything is built. In fact unless you are going to have a
DNS server on the dead network then you will cause problems by
configuring a DNS server.
Since the servers get their hosts files configured during the sub
install as long as no DNS is configured and your System->Server
entries are hostnames then you can leave the new servers on a live
network (just with different IPs than the production servers). They
won't talk to anything they can't resolve and without DNS the only
thing they will resolve is the other nodes of the cluster. You'll
want to watch out for multicast MOH if you do this, but otherwise it
should be safe.
The rest of your procedure looks fine, maybe a bit of overkill, but
definitely the safe way to go.
-Ryan
----- Forwarded Message -----
From: "Justin Steinberg" <jsteinberg at gmail.com>
To: "Lelio Fulgenzi" <lelio at uoguelph.ca>
Cc: "Ryan Ratliff" <rratliff at cisco.com>, "cisco-voip voyp list" <cisco-voip at puck.nether.net
>
Sent: Monday, October 26, 2009 10:16:28 AM GMT -05:00 US/Canada Eastern
Subject: Re: [cisco-voip] is all traffic endpoint initiated?
Lelio,
Are you planning to use new IP addresses for the entire cluster? if
so, I would do install the new publisher via DMA, select to use a new
IP address on a new isolated VLAN that doesnt have connectivity to
your production environment. Then once the ccmadmin page is up for
the new publisher, just go into the system>server menu and change the
IP addresses from the current 4.1/production IPs to the new addresses
you've allocated to the new cluster. Once you've changed the IPs
of the subscribers, I would reboot the system and then you should be
fine to put it on the production network.
Renaming the IPs is much easier than deleting and recreated - since
when you delete you have to rebuild all the dependencies, etc. I've
also had problems in the past with the old server names / IPs staying
around in some system configuration files that have required TAC
assistance to root in and manually edit these files.
Justin
On Oct 23, 2009, at 11:08 PM, Lelio Fulgenzi wrote:
Thanks Ryan,
Our plan was to:
install the new publisher using DMA with a new IP address on a new VLAN
reconfigure callmanager groups so they all use the publisher and only
the publisher
delete call park numbers on all subscribers
remove all previous subscriber information from the new publisher
start installing the new subscribers
rebuild callmanager groups and call park numbers
I'm not sure how I can do that on a dead network, since the install
process goes out and does DNS tests and NTP tests etc. Plus I need to
access my DMA upgrade file too, right?
I guess I could skip enabling DNS, NTP, etc, until just before step 5
once I put the publisher on a live network, and perform steps 1 thru 4
on an isolated VLAN with SFTP access to my DMA file?
What do you think?
---
Lelio Fulgenzi, B.A.
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
"Bad grammar makes me [sic]" - Tshirt
----- Original Message -----
From: "Ryan Ratliff" <rratliff at cisco.com>
To: "Lelio Fulgenzi" <lelio at uoguelph.ca>
Cc: "cisco-voip voyp list" <cisco-voip at puck.nether.net>
Sent: Friday, October 23, 2009 10:14:35 PM GMT -05:00 US/Canada Eastern
Subject: Re: [cisco-voip] is all traffic endpoint initiated?
The CUCM servers themselves initiate connections to each other and I
have seen post-DMA servers initiating connections (SDL, media
resources) to the 4.x servers because they were reachable. I'd highly
advise keeping your post-DMA servers on a dead-net until you can get
new IP addresses on them.
-Ryan
On Oct 23, 2009, at 8:53 PM, Lelio Fulgenzi wrote:
We are planning on building a new 7.1 cluster using DMA. I want to
make sure that we don't cause any service interruptions in our
production network. Can anyone confirm that any traffic, i.e.
registration is end point initiated? We only have SCCP and MGCP and
SRST devices out there. There's no reason for the new cluster to try
to talk to any of the devices out there is there?
---
Lelio Fulgenzi, B.A.
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
"Bad grammar makes me [sic]" - Tshirt
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