[cisco-voip] IOS VG Link redundancy

[Lelio Fulgenzi]

We currently have 4 VG224s and 1 3845 connected to multiple switches by using the two ethernet ports. We have loopback addresses for both voice and management (we don't do data on the ISR) vlans. Then we use EIGRP to advertise the loopback address to the network. Weighting prefers one route over the other. We got failover time down to the sub 5 seconds. The minimum EIGRP timer I think is 3 seconds. 

You could probably get a faster failover time if you were linking these devices directly to a layer 3 switch, but we are actually going through an access layer switch up to our collapsed core switch. 

We also decided on point-to-point networks for each interface on each device. Not sure if that's the long term approach though. I'll have to work that out with our networking team. For example, we might be replacing our PBX with a stack of VG224s which could reach anywhere between 10 or 20 deep. Do they want to manage that many P2P networks? The alternative is having two networks (one for side A, one for side B) - but this means many EIGRP neighbours and the possibility of routing traffic to one VG224 through another. I'm sure configs could fix this, but it's what's simpler and quicker. 



--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
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"Bad grammar makes me [sic]" - Tshirt 


----- Original Message ----- 
From: "Brandon Bennett" <bennetb at gmail.com> 
To: cisco-voip at puck.nether.net 
Sent: Monday, January 26, 2009 6:55:49 PM GMT -05:00 US/Canada Eastern 
Subject: [cisco-voip] IOS VG Link redundancy 

I have a number of voice gateways I would like to do link redundancy on. (Two ethernet interfaces going to seperate switches) 

Currently I am running OSPF on both links with /30's and then routing the loopback out to the gateway. I would like to move away from running services like OSPF on the voice gateways and having VG's participate in my routing network. 

What does everyone recommend/implement for link redundancy? HSRP?, Backup interfaces, Put everything on the same subnet and let proxy-arp do the work? 

Thanks in advance, 

Brandon Bennett 

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