[quagga-users 3927] Re: VRRP-OSPF Interoperability

[Michael DeMan]

Hi All,

We've gone through the same thing and gave up on VRRP.  Try carp.  It 
is a VRRP/HSRP like tool from OpenBSD that his ported several places 
now.  We run FreeBSD with lots of quagga and have been looking to solve 
the same issue, especially when looking 'downstream' on network 
segments where we need to provide OSPF for additional routing elements 
while also supporting older equipment that wants that single 
default-route and hence we need physical redundancy upstream via a 
single IP.

carp will give you a virtual interface on each of the redundant 
machines (or more) and then you configure that to redundant IP address. 
  Shut off quagga on that interface and run on the native interfaces, 
yet you still get that default-gateway via the carp interface.

Michael F. DeMan
Director of Technology
OpenAccess Network Services
Bellingham, WA 98225
michael at staff.openaccess.org
360-647-0785
On Feb 11, 2005, at 2:18 PM, Andrew J. Schorr wrote:

> On Fri, Feb 11, 2005 at 07:56:12PM +0000, Gavin Hamill wrote:
>> On Friday 11 February 2005 13:36, Andrew J. Schorr wrote:
>>
>>> I'm not sure about the general case, but I have routers that run OSPF
>>> on one interface and VRRP on other interfaces (using keepalived).  
>>> That
>>> works fine for me.  It seems to me that OSPF might get confused when 
>>> VRRP
>>> adds or deletes a virtual IP address on an interface running OSPF, 
>>> but I'm
>>> not sure...
>>
>> Andrew, I'm very interested by this solution - could you go into a 
>> bit more
>> detail for me? How does the failover work?
>
> Basically, we have a backbone network with a bunch of routers running 
> OSPF
> on it.   On this backbone network are 3 quagga routers that run
> keepalived and share a virtual IP address that faces a client network
> containing linux and solaris systems that are not running any routing
> protocols (they just have a static default route pointing to the VRRP
> virtual IP address).  Does that make any sense?  If not, I can
> try to elaborate, but I'm not good with ASCII art. :-)
>
>> I don't suppose you've had similar joy with BGP? We have a 
>> forthcoming need to
>> add redundancy to our network and it'd be great to know how this kind 
>> of
>> setup would work - google has not been my friend in this case :)
>
> I'm afraid I have almost no BGP experience, but I'm sure others are in
> a better position to help.
>
> Regards,
> Andy
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