[j-nsp] Juniper uRPF implementation

[Diogo Montagner]

Hi German,

I think it is based on forwarding plane because when you configure uRPF on a
multi-homed environment you need issue the command "set routing-options
forwarding-table unicast-reverse-path feasible-paths". You can find this on
JNCIS-M study guide. But there is no mention about default route. I think
you cannot use uRPF with only a default route.

./diogo -montagner


On Wed, Dec 3, 2008 at 6:38 PM, German Martinez <
gmartine at ajax.opentransit.net> wrote:

> Hello,
> We have an scenario where we have a bunch of routes in the routing table
> (RE) but we only let one default route go to the PFE.
> We achieve that by using forwarding filters.
>
> Could someone clarify Juniper's uRPF implementation, when only a default
> route is installed in the PFE?
> Are the uRPF decisions taken based on data found in the control planer or
> the forwarding plane?
>

>
> I am a bit confused because according to the documentation that I found the
> decisions are based on the routing table.  If I have all
> routes in my routing table I shouldn't have any issues.  Is that a right
> assumption?
>
> Thanks
> German
>
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