[cisco-voip] weighted EIGRP routes

[Lelio Fulgenzi]

I want to prefer one route over the other for troubleshooting and to avoid split brain. I'll probably have a data path go over the other router. I like the idea of using both devices, not just because it's idle, but because if you're using it, you know when it goes down. If it sits active/passive and the passive unit goes down, you'll never know. Even with alarms, a hung state is not always discovered. 

--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 


----- Original Message ----- 
From: "Nate VanMaren" <VanMarenNP at ldschurch.org> 
To: "Lelio Fulgenzi" <lelio at uoguelph.ca>, "cisco-voip voyp list" <cisco-voip at puck.nether.net> 
Sent: Thursday, March 18, 2010 10:01:23 AM GMT -05:00 US/Canada Eastern 
Subject: RE: [cisco-voip] weighted EIGRP routes 


How about GLBP instead of HSRP? By not use the gear you bought instead of having it sit idle? 

But I don't understand where HSRP comes into play for the VG224s if they have routes instead of a static default gateway? 

From: cisco-voip-bounces at puck.nether.net [cisco-voip-bounces at puck.nether.net] On Behalf Of Lelio Fulgenzi [lelio at uoguelph.ca] 
Sent: Wednesday, March 17, 2010 9:30 PM 
To: cisco-voip voyp list 
Subject: [cisco-voip] weighted EIGRP routes 




Any pointers on how to tell a downstream EIGRP neighbour to weigh one route better than another? Do I put the weight on the downstream neighbour to say EIGRP routes coming in on one interface should be weighted more heavily? Or on the upstream router to push down the weights? 

Basically, what I have is this: 



+-----------------------+ 
V V 
3945 -> switch -> VG224 <- switch <- 3945, where switch = SM-ESx-16 

(view with fixed font) 


Two 3945s with service module ethernet switches which connects to the two VG224 ports. All routing is done on the router and the switch provides layer two connectivity. A port channel group between the two switches allow the routers to communicate HSRP keepalives. The VG224 is an EIGRP stub, and the two upstream routers send out only default routes to the VG224 (that's all I want). 

Everything is working great. Except for the fact that the two upstream routers are equal weight. This means that when the VG224 is talking to the active HSRP address, it's going back and forth. Since the layer two link is up between the routers, it still works, but not ideal. Bad things happen if the link between the routers goes down - split brain! 

Any pointers? 




--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 






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