[cisco-voip] using two 3945s for SRST during upgrades - how to create voip dial-peer statements without causing a loop?

[Ben Amick]

I'm not sure if two SRST boxes would trigger this, but I know when you create a loop which doesn't resolve on both ends (context: a DP to your SIP trunk that matches all, followed by a DP to your CM that matches all) it'll loop back and forth until a timeout period, after which is goes busy.

I am curious though, why do you need SRST for the upgrades? Do you not have a publisher and subscriber that you could fail between?

Ben Amick
Telecom Analyst

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Lelio Fulgenzi
Sent: Thursday, May 04, 2017 1:30 PM
To: voyp list, cisco-voip (cisco-voip at puck.nether.net) <cisco-voip at puck.nether.net>
Subject: [cisco-voip] using two 3945s for SRST during upgrades - how to create voip dial-peer statements without causing a loop?


Hello folks,

Question regarding voip dial-peers. I've had some experience, but my design skills are lacking, especially when it comes to something like I'm trying to do.

Basically, I'd like to take advantage of our two 3945 routers and failover as many phones as possible.  Problem is, it will be too difficult to fail them over in ranges.

Can I create a dial-peer that says "5.... Pointer to router A" on router B, and "5.... Pointer to router B" on router A and not cause any routing loops?

Is there a built in mechanism that prevents this? Is there something I need to configure?

If it's too complicated and requires testing and time, I may have to forfeit the idea of using two routers and use just one and selectively pick those who failover. I mean, we have to do it anyways, since we have more than the two routers could handle. And it's a migration model that I might chose to use anyways, i.e. keep one router connected to the cluster and one not.

Thoughts?

Lelio

---
Lelio Fulgenzi, B.A.
Senior Analyst, Network Infrastructure
Computing and Communications Services (CCS)
University of Guelph

519-824-4120 Ext 56354
lelio at uoguelph.ca<mailto:lelio at uoguelph.ca>
www.uoguelph.ca/ccs<http://www.uoguelph.ca/ccs>
Room 037, Animal Science and Nutrition Building
Guelph, Ontario, N1G 2W1



Confidentiality Note: This message is intended for use only by the individual or entity to which it is addressed and may contain information that is privileged, confidential, and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient or the employee or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and destroy the material in its entirety, whether electronic or hard copy. Thank you
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20170504/ec8ccec3/attachment.html>