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Posted Jul 21, 2011 18:06 UTC (Thu) by raven667 (subscriber, #5198)
In reply to: IPv6 NAT by Cyberax
Parent article: IPv6 NAT

I don't see the number of organizations announcing routes changing just because of IPv6. I would actually see the number of existing IPv4 routes as an upper bound because consolidation seems likely. Providers can have large contiguous blocks that they can internally subdivide but should be able to announce in aggregate.

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Posted Jul 21, 2011 18:48 UTC (Thu) by hmh (subscriber, #3838) [Link]

BGP multihoming requires PI space, which does increase the routing table size _always_.

That's not the problem. The problem is that you pretty much have to de-aggregate your announcements to do traffic engineering, and that inflates the table a LOT more. And very large ISPs won't aggregate it back later:

The number of updates per second is just a matter of not using wimpy router CPUs to deal with large BGP feeds in the first place, and not doing full table feeds where it is not needed so that wimpy routers just have to deal with less than 5k routes and a few updates per minute.

Route table size is different, supporting very large route tables on high-speed routers is not that easy. However, I am still waiting to see a hardware router which does for its distributed TCAMs what your typical high-end CPU does for its L1/L2 cache. If anyone knows of a vendor that does this, please share.


Posted Jul 21, 2011 20:26 UTC (Thu) by mstefani (guest, #31644) [Link]

There will be consolidations especially in the provider space but a lot of small and medium businesses that are multihomed with NAT to their providers IPv4 addresses might go PIR. That is the big unknown: how many will go that route or stay with NAT/proxy based Internet access.

I don't see consolidation in route entries for global enterprises. Those will have multiple regional connection points to the Internet and will *need* independent routing for those.

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