Hi. How long did you wait to see your block come back during testing? I've seen it take > 60 seconds in some cases. For redundancy with non PI IP space, It's generally only important that the ISP you are getting the IP block from can see both routes, and that it sees it at the same level of localpref. (as path differences are okay, as long as they are consistent.) Since the isp providing the ip space will announce an aggregate larger than your block, you should be reachable as long as they can see both routes to you. -e
-----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Kyaw Khine Sent: Wednesday, October 19, 2005 11:39 PM To: nanog@merit.edu Subject: /24 multihoming issue
I'm having trouble announcing a single /24 from an ASN. ASN is multi-homed to ISP-A and ISP-B, prepending on ISP-B side. ASN in question has one and only one /24 which originally was from ISP-B /17 block.
Some ISP only sees path from ISP-A and some from ISP-B and very few sees both paths. Apparently, when we are testing failover, it failed. (can't get to most of the internet, can't VPN in from outside, can't send mails etc.... BGP paht/route disappear from some of looking glasses)
After the test, I registered /24 and ASN with RADB and things get slightly better, meaning a few more ISP sees both but majority of them still seeing single ISP path.
I've contacted both ISPs and they both claimed they are announcing our /24 to the rest of the world, without manipulation.
What am I missing here?
Thanks,
- Kyaw
__________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com