[j-nsp] improving global unicast convergence (with or without BGP-PIC)

[Dragan Jovicic]

Hello,

Basically I agree - as mentioned default should take over in the absence of
more specific ft entry. But, "acceptable" being a moving target, it's worth
mentioning this as a workaround more so than a final solution.

BR

-Dragan
ccie/jncie






On Wed, Apr 19, 2017 at 9:08 PM, Alexander Arseniev <arseniev at btinternet.com
> wrote:

> Hi Dragan,
>
>
> As for default route, if its installed in FT, I don't see why the router
> wouldn't use this entry in the absence of more specific (bearing all other
> issues with such setup).
>
> Yes, the 0/0 will be used BUT when there are 100,000s of more specifics in
> the FIB BEING REMOVED (simplest case, when eBGP+iBGP both supply just one
> 0/0 route each) there will be period of time when stale specific routes are
> stil used for forwarding -> packet loss persists for this period of time.
> BTW, You should deny BGP NH resolution via this 0/0, or the packet loss is
> unnecessarily prolonged.
> The FIB update happens with finite speed, be it route addition, route
> removal or route nexthop rewrite.
> NH rewrite is sped up with INH.
> The performance of the other operations is improved in recent JUNOS (16.1+
> if memory serves, ask Juniper account team for details).
> HTH
> Thx
> Alex
>
>