nanog mailing list archives
RE: /24 multihoming issue
From: "Ejay Hire" <ejay.hire () isdn net>
Date: Thu, 20 Oct 2005 12:31:34 -0500
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
Current thread:
- Re: /24 multihoming issue, (continued)
- Re: /24 multihoming issue Jon Lewis (Oct 19)
- Re: /24 multihoming issue Christopher L. Morrow (Oct 19)
- Re: /24 multihoming issue Kyaw Khine (Oct 19)
- Re: /24 multihoming issue Christopher L. Morrow (Oct 19)
- Re: /24 multihoming issue Kyaw Khine (Oct 19)
- Re: /24 multihoming issue Christopher L. Morrow (Oct 19)
- Re: /24 multihoming issue Elmar K. Bins (Oct 20)
- Re: /24 multihoming issue Kyaw Khine (Oct 19)
- Re: /24 multihoming issue Christopher L. Morrow (Oct 19)
- Re: /24 multihoming issue Kyaw Khine (Oct 19)
- Re: /24 multihoming issue Randy Bush (Oct 20)
- Re: /24 multihoming issue John Payne (Oct 20)
- Re: /24 multihoming issue Randy Bush (Oct 20)
- Re: /24 multihoming issue John Payne (Oct 20)