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The point is we will aggregate other ISP's prefixes if they are CIDR able. Most of the case are there are holes in the range so CIDR is out-of-question.

While the other camp insist to filter out any routes more specific than /20. They are doing nothing to re-allocate their PA assigned to multi-homed customers so CW can CIDR them into /20.

The funny thing is the solution are controlled by the other camp but they are all talk but no action. (Or trying to tell you multi-homed is a bad idea because they can't deal with the routing table ).

I am not sure I am following you here. Are you saying that we should re-adress customers so that we get larger blocks of PA space to give to mulithomed customers?

I think that re-addressing is pretty hard to do in any larger scale, although that would certanly help some other issues.

That's why filtering /20 only without re-aligning the holes in the block won't work. In the end /20 make the routing table looks pretty but they are black-holing lots of traffic. As we all agree that re-assign address is NOT practical at all thus just filtering /20 block is not a good solution.

another good start would be to start reclaiming space that has been handed out from various ISPs old B-space and later taken with the customer. I know a few operators that have done that (including us to some extent), and it's a rather demanding task but will help the operators and reudce the routing table as well.

- kurtis -

I am with you here. Starting from the beginning is much better than asking them to change later. Ping Lu Cable & Wireless USA Network Tools and Analysis Group W: +1-703-292-2359 E: plu@cw.net