[j-nsp] Full table in L3VPN

Saku Ytti saku at ytti.fi
Tue Sep 2 02:43:54 EDT 2014

On (2014-09-02 06:56 +0200), Mark Tinka wrote:

> This is one of those polarizing questions where you'll get 
> an equal share of answers from both sides of the bench.

I think main reason is, because it appears scary, and I subscribe to that
notion myself.

When I try to explain it to myself in technical terms, I'm drawing up short.
In smart implementation, there should be insignificant DRAM use increase due
to few bytes of RT and RD, none of these should affect HW resource use in
Infact JunOS and IOS should not have implied 'Default' VRF, it should be
configured VRF like any other VRF. Because it simplifies the code-base, when
you do not create VRF-aware and VRF-unaware features.
Infact if you look at FIB/HW, there global table is already just another VRF,
as these structures lend poorly to exceptions. It's only the control-plane
code, which due to legacy reasons contain duplicate code for exact same stuff,
causing annoying feature parity problems amongst others.

I think the main benefit would be obviously the ease of adding Internet access
to other VRFs.


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