On Mon, 24 Sep 2001, Randy Bush wrote:
I'll try to explain what I am getting at.Very often a newbie ISP doesn't quite understand what this is all about.They get an ASN cuz everyone else has one.Their upstream does static routing to them so rather than having their /19 show upas AS34567, it shows up as origin=AS11111 (their upstream).
If I go the Oregon router server and look up their /19 and find only 1 path to that /19 or I find that the ASN origin has disappeared and been replaced by their upstream then there is no justification for getting an ASN.
understood the motivation.did not understand the mechanism.
in arin-land, i think they actually ask to see proof of dual-homing before issuing the asn.but you want to TEST that it is actually deployed.what is not clear to me is HOW to do that.please take into account the problem of bgp best-path-only propagation.
I do the same in RIPEland as well. BGP best-path-only does put a crimp in the works which is why one needs to check a few public route servers. I cycle thru all multihomers (that I have allocated) every few months and check 3-4 large route servers or LGs and see who doesn't show up at all (went bellyup) or has only 1 path (dropped the 2nd due to economic downturn).
randy
Hank Nussbacher