[j-nsp] Dealing with multihomed customer BGP primary/backup links

[Cydon Satyr]

uRPF check doesn't work since customer can just advertise his routes over
backup link.
I had some hopes for conditional bgp advertisement and SCU/DCU but I don't
think it works not to mention it's like trying to kill a bee with a hammer.

What about MC-LAG between two routers and just setting one link as backup
one as primary...or something?
It has to be something which doesn't require any change on customer side.

Thanks

Regards

On Wed, Jul 13, 2016 at 11:33 PM, Mark Tinka <mark.tinka at seacom.mu> wrote:

>
>
> On 13/Jul/16 22:23, Clinton Work wrote:
>
> > On the primary BGP session I would set Local-pref 150 and send MED 100
> > for example.
> > On the backup BGP session, set local-pref 100 and send MED 150.
> >
> > The local-pref will set the preferred route in your network to use the
> > primary BGP session.   The MED should influence the customer to use the
> > primary link as their preferred route as well.  Savvy customers can
> > easily override the MED value, but it should work for the majority of
> > the customers.
>
> Savvy customers can just de-aggregate and override LOCAL_PREF values.
>
> Also, assuming the customer resets MED, LOCAL_PREF only provides control
> in one direction. Nothing stops the customer from statically routing
> traffic over a specific path (or both paths simultaneously) for outbound
> traffic.
>
> Mark.
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