North American Network Operators Group

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Re: v6 multihoming (Re: The Choice: IPv4 Exhaustion or Transition to IPv6)

  • From: Donald Stahl
  • Date: Fri Jun 29 11:00:00 2007

If you took everything on v4 today and migrated it to v6 tomoro the routing table would not grow - actually by my calculation it should shrink (every ASN would only need one prefix to cover its current and anticipated growth). So we'll see 220000 routes reduce to 25000.
Even if you gave everyone 2 or 3 bits to deaggregate with for TE purposes the table would _still_ be smaller. As the majority of people multihoming would never use more than 1 bit for TE purposes you would only end up with 50k routes.

TCAM's and routers in general have always been able to keep up with table growth. As long as we don't do anything mind numbingly stupid they will continue to keep up. They won't be able to keep up, however, if we run out of addresses and ISP's start getting allocations of 200 separate /24's or if we need to start announcing /25's and longer.