[j-nsp] load balancing in Route reflector scenario

[Keegan Holley]

2011/8/10 Robert Raszuk <robert at raszuk.net>

> Hi Keegan,
>
>
>     By default Junos and IOS-XR advertise only those best path in BGP
>>    which actually are installed into forwarding. Advertising inactive
>>    knob will overwrite it.
>>
>> Wouldn't this lead to traffic being blackholed?  If all the routes for a
>> given destination are inactive would this still cause BGP to advertise a
>> route for them?
>>
>
> Nope ... there can be other "producers" of the same route (OSPF, ISIS,
> STATIC) which will be in the RIB. If not there is always next step - less
> specific route to be used.
>

I suppose there's a use for this or the feature wouldn't exist, but why
would you have a route in the IGP that's not in BGP but still needs to
receive traffic from routers running an IGP and BGP but not learning the
route from the IGP.  Why not just import the route(s) into BGP.  It just
seems like this command may cause unexpected behavior to add features that
can be configured in a more graceful manner.

>
> So there are some valid cases where you may want to attract by BGP all
> traffic, but switch it according by your own policy and not by BGP decision.
>
> Cheers,
> R.
>
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