[j-nsp] BGP peering from a VIP address

[Stefan Fouant]

The motivation is that currently there are a number of devices peering with
a singular router... folks are interested in introducing another router for
redundancy and configuring them in a VRRP group.  They aren't interested in
configuring secondary BGP sessions on a number of devices hence it was
proposed that we simply peer with the VIP address...

And before you say 'route relection' I already went down that path.  It
elimates the multiple peerings, but still introduces the single point of
failure.

For what it's worth, I'm probably going to just push to do two BGP
sessions...

Stefan Fouant
On Fri, Mar 28, 2008 at 12:30 PM, Pekka Savola <pekkas at netcore.fi> wrote:

>  On Fri, 28 Mar 2008, Stefan Fouant wrote:
> > There is some internal debate here in my office today as to whether or
> not
> > Juniper can support a BGP implementation in conjunction with VRRP, as
> in,
> > BGP is sourced from a VRRP VIP address.
> >
> > Now before everyone attempts to tear me a new one...  I should state
> that
> > I'm pretty sure this shouldn't be done and to do so would pretty much
> break
> > the protocol in every way imaginable... however, I am being told that
> Cisco
> > has some knobs to accomplish this and I just want to be certain if
> Juniper
> > can do something along these lines...
>
> I guess this would work, for some definition of "work", if you add
> "accept-data" under VRRP config.
>
> The BGP session would flap when VRRP mastership switches (TCP reset,
> so it would likely be re-established quickly), but depending on the
> number of routes carried and some other BGP timers, this would be
> possible.
>
> I'm not sure what motivation there would be to configure BGP to VIP
> address, instead of just having two BGP sessions and tuning down BGP
> timers (and/or using BFD).
>
> --
> Pekka Savola                 "You each name yourselves king, yet the
> Netcore Oy                    kingdom bleeds."
> Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
>