[c-nsp] VPN failover / load sharing using IOS?

[Rodney Dunn]

There are really on two ways to do this:

a) you announce some subset of routes down
   one gre tunnel from the headend and prefer
   them and the other subset over the backup tunnel

that way if one tunnel goes away you will have failover.
The drawback there is the load sharing isn't dynamic.

The only way you can get dynamic loadsharing in
this type of setup is OER.

b) Do OER at the spoke side and let it load balance
   the traffic back towards the headend.

They were going to put a sample of that in the OER
deployment guide but I'm not sure they have gotten
to it yet.

http://www.cisco.com/go/oer

Rodney

 

On Tue, Feb 08, 2005 at 10:31:43PM -0600, Brian Feeny wrote:
> 
> thanks, although that looks to be for sites with multiple routers and  
> multiple links.  Each of these sites is only going to have one router,  
> that takes in 2 T1's.  I don't think that will work in that scenrio.
> 
> Brian
> 
> On Feb 8, 2005, at 10:07 PM, Cameron.Dry at didata.com.au wrote:
> 
> > Check out:
> >
> > http://www.cisco.com/en/US/products/sw/iosswrel/ps5012/ 
> > products_feature_
> > guide09186a00800ed370.html
> >
> > Cameron
> >
> >
> >
> >
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net
> > [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
> > signal at shreve.net
> > Sent: Wednesday, 9 February 2005 11:50 AM
> > To: 'cisco-nsp'
> > Subject: [c-nsp] VPN failover / load sharing using IOS?
> >
> >
> > Has anyone done any type of VPN failover and/or load balancing using
> > IOS?
> >
> > For example something like a 2 1700 routers, each with 2 T1 cards in
> > them,
> > Each T1 card would be connected to a different ISP, each with its own
> > IP space
> > (no BGP).  Either T1 would be able to go down, and the VPN could
> > re-establish
> > itself over the remaining T1.  Both T1's would be load balanced over
> > for VPN
> > connectivity.
> >
> > Is it possible to establish 2 VPN's, 1 over each link, with the same
> > source/destination private networks defined, and have the router load
> > balance these and also work in failover?
> >
> > Another thought, which is kind of ugly (but maybe not), is 2 GRE
> > tunnels, and then dual static routes over the tunnels:
> >
> > Router 1 T1 #1  <----------------------- GRE Tunnel #1
> > -------------------> Router 2 T1 #1
> > Router 2 T1 #2 <------------------------ GRE Tunnel #2
> > -------------------> Router 2 T1 #2
> >
> > ip route <insert vpn endpoint ip> 255.255.255.255 Tunnel1
> > ip route <insert vpn endpoint ip> 255.255.255.255 Tunnel2
> >
> > Then establish the VPN on top of the above.  I don't particular like
> > the idea of building a tunnel on top of 2 other tunnels, so if anyone
> > has experience in doing this type of setup, please share what you used
> > to do it.
> >
> > Brian
> >
> >
> >
> > Brian Feeny, CCIE #8036, CISSP
> > Network Engineer
> > ShreveNet Inc.
> >
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> 
> Brian Feeny, CCIE #8036, CISSP
> Network Engineer
> ShreveNet Inc.
> 
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