Saumya,

> On Aug 5, 2025, at 10:27 AM, Dikshit, Saumya 
> <[email protected]> wrote:
> 
> I understand that pre-policy and post-policy is generic spectrum under which 
> all filtering is covered. Hence the query.
>  
> Considering it’s BMP (aiding troubleshooting, monitoring the BGP Control 
> plane), there should be obvious and not-so-obvious sub-categories defined for 
> “post-policy”.
> Is this a work-done or parallelly being followed in the WG.

A general comment is that enhanced statistics is relatively new work in grow.  
If you were to review some prior working group meeting recordings, one of the 
things you'll see is some desire to not only add new vendor-neutral stats which 
this draft did, but find a release cadence for such new counters.  I.e., don't 
try to cram everything into a never-shipping internet-draft. :-)

 
> I was looking explicitly for cross EVI (EVPN) absorption facilitating Dynamic 
> IVRL in layer-3 and Cross-EVI MAC (collapsing bridge-domains) absorption in 
> case of layer-2.
> As I mentioned, was looking at VPN specific AFI’s including l2vpn and 
> vpnv4/v6.   

I suspect you'll find members of the WG receptive to some additional per 
afi/safi stats.

For the EVI or more generally the per "instance" cases, this may get more 
interesting.  The general use case is roughly "how many routes have been 
learned by the instance?"  This further could break down to whether routes are 
learned within the instance, or have been leaked in via the VPN mechanisms.

The challenge is such statistics are not only per-router, but also for a high 
level definition of the "instance". Streaming such things abstractly in BMP 
will be an interesting keying challenge.  But it will also raise the question 
about whether the mechanism is "too noisy".  Discussion on the points should be 
interesting.



-- Jeff

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