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Internet routers hitting 512K limit, some become unreliable

Internet routers hitting 512K limit, some become unreliable

Internet routers hitting 512K limit, some become unreliable

At the heart of the issue, the growth of routable networks on the Internet overwhelmed the amount of memory set aside in infrastructure hardware, typically routers and switches, that determines the appropriate way to route data through the Internet. For the first time, the lists of routable networks—also called border gateway protocol (BGP) tables—surpassed a significant power of two (two to the 19th power or 512K). Many older routers limit their use of a specialized, and expensive, type of memory known as ternary content-addressable memory (TCAM) to 512K by default.

This can e verified by :

s01#sh ip bgp sum

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
80.202.67.98 4 15659 20549475 1113714 40910421 0 0 11w4d 501298
80.202.68.56 4 15659 17041852 1115479 40910421 0 0 6w6d 501291

And utilization of our outer switches is :
Total :

s01#sh mls cef maximum-routes

FIB TCAM maximum routes :
=======================
Current :-

IPv4 + MPLS – 512k (default)
IPv6 + IP Multicast – 256k (default)

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