[c-nsp] Cisco N540-ACC-SYS ipv4 routes

[Phil Bedard]

It wouldn't be implemented on a platform that doesn't support an external TCAM.  It doesn't make much sense on a fixed platform with a single NPU (really ASIC but NPU is easier to type)  since all the interfaces are sharing the same FIB.  We would also never mix/match NPU scale types on the same fixed platform in the case where we have multiple NPUs.    

The feature doesn't really have a lot of adoption, most buy the SE line cards for roles needing higher FIB scale.    

Thanks, 
Phil 

On 7/12/20, 7:11 PM, "Jason Lixfeld" <jason at lixfeld.ca> wrote:

    Will 'set path-color external-reach’ get support on NCS540?

    > On Jul 12, 2020, at 1:25 PM, Phil Bedard <philxor at gmail.com> wrote:
    > 
    > In XR in general we support restricting routes installed in the FIB using table-policy at various locations, but it's done across all NPUs.  This specific feature mixing hi/lo FIB line cards adds another knob to tag certain routes as "external" so we can determine which prefixes to install on cards with only external TCAM.   
    > 
    > The normal table-policy command is supported on NCS540, some use them as dedicated RRs.   There is a 16 (newer N540-ACC-SYS) and 32 GB (24Z8Q2C-SYS) version of the 540.   
    > 
    > Thanks, 
    > 
    > Phil 
    > 
    > On 7/10/20, 2:10 PM, "cisco-nsp on behalf of Jason Lixfeld" <cisco-nsp-bounces at puck.nether.net on behalf of jason at lixfeld.ca> wrote:
    > 
    > 
    > 
    >> On Jul 10, 2020, at 2:56 AM, Mark Tinka <mark.tinka at seacom.com> wrote:
    >> 
    >>> In the 9K days, they had SVD which did that:
    >>> 
    >>> https://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-3/routing/configuration/guide/b_routing_cg43xcrs/b_routing_cg43xcrs_chapter_010.html#concept_8E1919490E274B9E97F527166CB6EF8A
    >>> 
    >>> I don’t know if SVD exists for chassis based NCS5K or if SRD^h^h^htable-policy is the new that, but SVD was per-linecard.  Table-policy is a BGP sub configuration, and presumably LC agnostic.
    >> 
    >> Never heard of SVD, but I found this for the NCS5500:
    >> 
    >>   https://xrdocs.io/ncs5500/tutorials/mixing-base-and-scale-LC-in-NCS5500/
    > 
    > 
    >   Nice.
    > 
    >   There’s caveat at the bottom of that article that says it’s not supported on J-based FFF pizza boxes. I wonder why?  I wonder if that applies to Qumran-AX a’la NCS540 too?
    > 
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