nanog mailing list archives
Re: intra-AS messaging for route leak prevention
From: Mark Tinka <mark.tinka () seacom mu>
Date: Tue, 7 Jun 2016 08:35:53 +0200
On 6/Jun/16 17:54, Job Snijders wrote:
There is the "human network" approach, where operators share information with each other which be used to generate config to help block "unlikely" announcements from eBGP neighbors. For instance AT&T and NTT agreed (through email) that there should be no intermediate networks between 2914 & 7018, therefore NTT blocks announcements that match as-path-regexp '_7018_' on any and all eBGP sessions, except the direct sessions with 7018. NTT calls this concept "peerlocking".
I suppose if one is performing prefix- and ASN-based filtering, then you "should" not learn peer paths via customers. If you augment that with AS_PATH-based filtering, you "will not" learn peer paths via customers. One thing we do to reduce opportunistically hazardous vectors is to not learn customer paths via peers. Mark.
Current thread:
- intra-AS messaging for route leak prevention Sriram, Kotikalapudi (Fed) (Jun 06)
- Re: intra-AS messaging for route leak prevention Job Snijders (Jun 06)
- Re: intra-AS messaging for route leak prevention Joe Provo (Jun 06)
- Re: intra-AS messaging for route leak prevention Mark Tinka (Jun 06)
- Re: intra-AS messaging for route leak prevention Sriram, Kotikalapudi (Fed) (Jun 08)
- Re: intra-AS messaging for route leak prevention Joe Provo (Jun 08)
- Re: intra-AS messaging for route leak prevention Mark Tinka (Jun 08)
- Re: intra-AS messaging for route leak prevention Sriram, Kotikalapudi (Fed) (Jun 09)
- Re: intra-AS messaging for route leak prevention Job Snijders (Jun 10)
- Re: intra-AS messaging for route leak prevention Mark Tinka (Jun 10)
- Re: intra-AS messaging for route leak prevention Leo Bicknell (Jun 10)
- Re: intra-AS messaging for route leak prevention Mark Tinka (Jun 10)
- Re: intra-AS messaging for route leak prevention Joe Provo (Jun 11)
- Re: intra-AS messaging for route leak prevention Job Snijders (Jun 06)
- Re: intra-AS messaging for route leak prevention Christopher Morrow (Jun 10)