Arista Routing Solutions

Thu Apr 28 11:06:15 UTC 2016

    Well,

    Once you eliminate the ~160k superfluous prefixes (last time I
checked)...  This is a none issue.

    Some work on some sort summary function would keep those devices
alive...  but we all know there is more money to be made the faster the
device become obsolete :(

-----
Alain Hebert                                ahebert at pubnix.net   
PubNIX Inc.        
50 boul. St-Charles
P.O. Box 26770     Beaconsfield, Quebec     H9W 6G7
Tel: 514-990-5911  http://www.pubnix.net    Fax: 514-990-9443

On 04/28/16 01:33, lincoln dale wrote:
> On Wed, Apr 27, 2016 at 4:41 PM, Peter Kranz <pkranz at unwiredltd.com> wrote:
>
>>         Curious if you have any thoughts on the longevity of the 7500R and
>> 7280R survival's with IPv4 full tables? How full are you seeing the TCAM
>> getting today (I'm assuming they are doing some form of selective
>> download)? And if we are currently adding 100k/routes a year, how much
>> longer will it last?
>>
> I can't speak for Ryan or Netflix, but we (Arista) are stating our
> technique is good for 1M+ prefixes of IPv4+v6 combined.  Internet right now
> is at between 575K and 635K IPv4 and between 28K and 35K IPv6 right now and
> its taken many many many years to get there, its foreseeable there's many
> years of growth there.
> Note that we don't do static partitioning between IPv4 and IPv6 and our how
> we do it has more headroom in it than we state, so we're confident.  We're
> also not doing "selective download", this is every prefix in current table.
>
> What I can share is two different scenarios today:
>
> 1. a traditional internet edge router with multiple transit/peer providers,
> Internet as of right now, and a cloud customer  that also has hundreds of
> thousands of prefixes internally
> Ryan's case might be different to others, but here are three scenarios
> deployed today: 1. a large hosting provider with full tables and many
> internal prefixes, 2. a cloud deployment.
>
> The former is at 854K IPv4 and 35K IPv6 of 'internet' as of a few weeks ago:
>
> 7500R# show ip route summary | grep Total
> Total Routes                                          575127
> 7500R# show ipv6 route summary | grep Total
>  Total Routes                          35511
> 7500R# show hardware capacity | grep Routing
> Forwarding Resources Usage
>
> Table    Feature    Chip         Used   Used      Free   Committed   Best
> Case       High
>                               Entries    (%)   Entries     Entries
> Max  Watermark
>
>  Entries
> -------- ---------- --------- -------- ------ --------- -----------
> ----------- ---------
> Routing  Resource1                  815   39%     1233           0
>  2048        817
> Routing  Resource2                  469   45%      555           0
>  1024        471
> Routing  Resource3                14074   42%    18694           0
> 32768      14098
> Routing  V4Routes                696364   88%    89753           0
>  786432     697110
> Routing  V6Routes                     0    0%    89753           0
>  786432          0
>
>
> The latter is at 854K IPv4 + 45K IPv6:
>
> 7500R# show ip route summary | grep Total
> Total Routes                                          854393
> 7500R# show ipv6 route summary | grep Total
>  Total Routes                          45678
> 7500R# show hardware capacity | grep Routing
> Forwarding Resources Usage
>
> Table    Feature    Chip         Used   Used      Free   Committed   Best
> Case       High
>                               Entries    (%)   Entries     Entries
> Max  Watermark
>
>  Entries
> -------- ---------- --------- -------- ------ --------- -----------
> ----------- ---------
> Routing  Resource1               1319    64%       729           0
>  2048       1320
> Routing  Resource2                809    79%       215           0
>  1024        814
> Routing  Resource3              24102    73%      8666           0
> 32768      24104
> Routing  V4Routes              644336    83%    124302           0
>  786432     644364
> Routing  V6Routes               17792    12%    124302           0
>  786432      17795
>
>
> One could ask Geoff Huston where he thinks combined IPv4+v6 will exceed 1M
> entries but I would expect it to be many years away based on
> http://bgp.potaroo.net/ and we'd welcome discussions about if it you want
> to know our opinion [*] on how we're doing it will scale.  What we're doing
> doesn't explode at 1M, there's headroom in it hence why we say "1M+". Again
> we're happy to talk about it, just ask your friendly arista person and if
> you don't know who to ask, ask me and i'll put you in touch with the right
> folks.
>
>
> cheers,
>
> lincoln.  [*] ltd at arista.com
>