[j-nsp] Optimizing the FIB on MX

[Adam Vitkovsky]

> Raphael Mazelier
> Sent: Thursday, February 18, 2016 10:55 PM
>
> Very interresting topic.
>
> Some questions about your setup :
>
> In 2) you set advertise-external, is it working the same by using multipath ?
>
No
Multipath between iBGP paths would be similar to 'protect core'
Multipath between eBGP and iBGP paths would be similar to 'unicast protection'
Whereas in protection mode you use one active path and the other path is backup and in multipath both paths are active.

The "advertise-external" would be needed in both cases to provide the alternate/backup path


> In 3) you set 'unicast protection'. It is the same thing as PIC 'protect core'
> knob ?
>
In essence yes, as both are using Prefix Independent Convergence(FIB hierarchy) and both pre-install a backup next-hop.
'unicast protection' is used to protect against PE-CE link failure.
'protect core' is used to protect against PE node failure.

> If I understand correctly, before 15.1 PIC is only available on l3vpn, so my
> question is :
>
> Is it advisable to run the dmz/internet table in a vrf/routing instance on
> juniper ? and what are the pros/cons of doing that ?
>
> pros : PIC, more flexibily ?
> cons : more complex setup, performance issue (I've heard some storie about
> that) ?
>
As you pointed out the biggest pro is the flexibility this setup provides, you can have VRF for Peers and another for Transits.
But I'm not aware of any performance issues, certainly the convergence is faster with BGP-PIC.

adam



        Adam Vitkovsky
        IP Engineer

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