Xenophilia (True Strange Stuff)

The blog of Xeno, a slightly mad scientist

The internet hit 512K BGP routes today, causing widespread network issues.

https://i2.wp.com/www.renesys.com/wp-content/uploads/2014/08/plot2.png

BGP is a routing protocol that coordinates routes to blocks of IP addresses. … all edge routers across the Internet keep a full routing table; for example, your ISP’s edge router has a map of the entire Internet in its memory and knows where to forward one of your packets … The issue today is that routers only have a certain amount of memory for these routes. Router memory size compared to the Internet’s BGP routes has been an issue for [a long time]. One way to fix it is by “aggregating,” which is taking two smaller routes and combining them into one, thereby turning two announcements into merely one. …

BGP is a routing protocol that advertises routes externally, each large organization advertises some BGP routes at the edge of their network. Each edge device has a routing table with all the advertised BGP routes from around the internet. By the sounds of it there are hardware limitations on these edge routers that can only hold 512k routes in their routing table, which is the number we hit today.

http://www.reddit.com/r/sysadmin/comments/2dcol3/the_internet_hit_512k_bgp_routes_today_causing/

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This entry was posted on August 12, 2014 by in Technology.
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