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Re: Failover for a multihomed site with unreachable ISP
On donderdag, maa 27, 2003, at 09:49 Europe/Amsterdam, Christian Schild
Maybe a better solution would be a backup organization that announces
the /32 if it disappears and tunnels the packets to the customers over
the secondary ISPs.
I'm not sure if I got your point here. Are you suggesting that another
It could. An ISP could set up a related, but independent backup
network. Since this network would only have to peer or buy transit in a
couple of locations and maintain a bunch of tunnels, this wouldn't be
has to take over all the traffic for the disconnected ISP? I hardly
this will ever happen in the real world :)
If the routers must be able to handle the full set of unaggregated
prefixes anyway, why bother aggregating?
Memory scales linear so that's not the biggest problem. Processing
scales worse than linear so in the end that will be the downfall of
huge routing tables.
Well, a large routing table is only a memory/msg-size problem.
This isn't a protocol issue. Vendors can implement this today, but they
choose not to.
forwarding table also slows down the forwarding process. With automatic
aggregation at least the latter is solved.