Redundancy design signaling server/core 0 - PBX Info :: Your Free PBX, PABX and Telephone Information Resource

dltone · 06-28-2006, 03:44 PM

A question came up recently and I can't imagine Nortel hasn't addressed it somewhere, but our local office didn't have any ideas.

During the addition of the latest patches to our CS 1000M Large System, our Core 0 IP connection went down and the Core 1 IP kept coming up as the default. The Signaling Server only has one entry for a Call Server IP address (which is our Core 0 address). Thus, the signaling server could no longer communicate with the pbx, and incoming calls were not actually ringing on the IP sets. The signaling server stayed UP, so it technically wouldn’t have failed over to a backup. Is there another entry somewhere for a failover Call Server IP address?

Any ideas would be great, as it created some doubt about the true redundant nature of the IP phones. If we ever can't get that Core 0 IP interface up, all of the IP sets would be down again.

thanks!

**Fletch** · 06-28-2006, 05:58 PM

I have demonstrated this for customers many times by pulling out Core 0. You have 2 IP addresses (Core 0 and Core 1) however the only time the Core 1 IP is used, is when the machine is in Split Mode (maintenance). The active Core uses the address assigned to Core 0.

Now on the data side, there is what is called an ARP table that maps IP address to MAC address. Is it possible that the ARP cache on the data switch did not update, and was pointing the Core 0 IP to the old Core 0 MAC? This ARP table should have refreshed the Core 0 IP to the active Core 1 MAC.

Unfortunately this has to be tested in a maintenance window. Now this is the most plausible scenario I can think of, there may be others. This is a problem that I have witnessed before where a XYZ data switch did not update it's ARP cache.

PHONE_TECH · 06-29-2006, 03:22 PM

We are using the Sig Server and CS1000,system installed in January but we had some issues whith switching in the midnight routines.My manager wants them to switch each night but I don't know if this is a common practice or even if it is recommended.
We switched out our processors and all was well for about a month.Yesterday the cores wouldn't switch in the midnight routines but switched as scheduled this morning.
Anyone else having this issue or who out there has theirs set to switch.
Just curious.

TomasSouth · 07-03-2006, 05:10 AM

Quote:

Originally Posted by dltone

The Signaling Server only has one entry for a Call Server IP address (which is our Core 0 address).

That IP address that you put is giving you ambiguous idea as address of Core 0 alone. Which is not.

Nortel has no mistake in designing as in Element Manager setting only one entry for Call Server IP address.

TomasSouth · 07-03-2006, 05:12 AM

Quote:

Originally Posted by dltone

Thus, the signaling server could no longer communicate with the pbx, and incoming calls were not actually ringing on the IP sets.

It might be the patches that you recently put that causes this problem.

**Fletch** · 07-03-2006, 09:19 AM

Quote:

Originally Posted by PHONE_TECH

My manager wants them to switch each night but I don't know if this is a common practice or even if it is recommended.

In the CFN (LD 17) under OVLY set the MID_SCPU to YES

Code:

OVLY 
  SID  0 
  BKGD 044 
  PBXH X
  TODR 00 
  DROL 030 032 045 135 137 
  MID_SCPU YES 
  CY45 00 
  MULTI_USER ON

This will force the Cores to switch during the Midnight Routines. This is no longer required, however, since many users still feel more comfortable with a CPU swap, this prompt was added.

datadump · 07-03-2006, 02:49 PM

also the cores do keep the same IP address after the swap, the CP's MAC address is the only change.

PHONE_TECH · 07-05-2006, 07:49 AM

We installed a patch Monday that came out in April that was suppose to correct this issue.Unfortunately they didn't switch last night so back to the drawing board.

dltone · 07-06-2006, 02:32 PM

Fletch, I think you may be correct for my original post. The cores were split at the time, so that does help me feel better about it switching connectivity over to Core 1, if core 0 was really down.

thanks for the help! It is great to have a resource like yourself here.

**Fletch** · 07-06-2006, 02:41 PM

Not a problem. Many folks at Nortel view this site as a valuable resource and insight to customer needs. It is not our intention to circumvent your normal maintenance providers, and you should always make an effort to keep them involved.

We will, though, make every effort to assist and clarify any difficulties raised. Rick provides a great service to the user community by providing space on this forum for everyone to exchange ideas and tips.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Scaling a VoIP Network	rixride	VOIP Talk	2	10-29-2006 06:14 PM
Looking for PBX Design Engineer	Newton	Other	0	04-24-2006 08:05 PM
RE: Timers	crossbar50	Meridian Systems	17	05-04-2005 09:21 AM
Signaling server	dixiedogger	Meridian Systems	6	10-17-2004 08:29 AM
Signaling Server Problems	mac11	Meridian Systems	2	08-27-2004 05:09 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)