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Re: more-specifics via IX

  • From: John Payne
  • Date: Mon Oct 15 08:37:14 2007
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On Oct 15, 2007, at 7:41, Wolfgang Tremmel <[email protected] cix.net> wrote:


Am 15.10.2007 um 07:09 schrieb Bradley Urberg Carlson:


I have a few customers' customers, who appear at a local IX. Due to the MLPA-like nature of the IX, I hear their prefixes both at the IX and via my own transit customers. I normally use localpref to prefer customer advertisements over peers' advertisements.

There is a customer's customer who is advertising more-specifics at the IX (and using a different source AS, to boot). I can think of a couple ways to prevent hearing these, but thought I should ask for suggestions first.


you should honor your customers routing policy and simply accept the routes.

Whilst it is nice to accept a downstream of a downstream's routing policy like that I don't think it is your place to say that. The other response asking what the problem is also is a good example of the misunderstanding of problems with the shim6 solution although at a different place in the network. If MY policy is to send all customer traffic through my customer connections, I should be able to do that.

To answer the OP's question I'd be looking at manually filtering the more specifics if they are also sending the aggregates through the IX.