Brocade SLX Internet Edge

Thu Nov 1 18:55:38 UTC 2018

Chris Welti wrote on 11/1/2018 10:03 AM:
> Nicolas Fevrier has a very detailed blog post on how Cisco handles the prefixes on their Broadcom Jericho based NCS 5500 gear.
> https://xrdocs.io/cloud-scale-networking/tutorials/2017-08-03-understanding-ncs5500-resources-s01e02/
>
> I'm pretty sure the principle is more or less the same for the Jericho based platforms on Arista and Extreme.
>
> Best regards,
> Chris

I love the nitty gritty detail in this author's post and I'm glad he 
concludes by stating clearly that while the base card (spec sheet says: 
"On-chip tables for 256K IPv4 or 64K IPv6 routes" and "On-chip tables 
for 786K IPv4 host routes, MAC, and labels") can actually hold a full 
BGP table today when configured appropriately, Cisco still recommends 
the scale cards for that application (spec sheet says: "FIB scale up 2M 
IPv4 or 512K IPv6 routes" and "On-chip tables for 786K IPv4 host routes, 
MAC, and labels").

I do have to wonder about the internal expansion of each /23 route into 
two /24 routes in their FIB algorithm, as I would have thought Cisco 
would have attempted to go the opposite way, but I'm sure Cisco has 
their reasons.