And of course a good SP will strip that AS from the AS_PATH using 'as-
override' or some similar feature :-)
-- Regards, Rick Mur CCIE2 #21946 (R&S / Service Provider) Juniper JNCIA-ER & JNCIA-EX MCSA:Messaging, MCSE Sr. Support Engineer IPexpert, Inc. URL: http://www.IPexpert.com On 18 aug 2009, at 18:42, ALL From_NJ wrote: > Great example and explanation Marko. > > As Marko says, it is very common w/ MPLS, as some SPs will assign each > customer only one private AS for all their sites, nd in some cases, > regardless of the number of sites. > > > > On Tue, Aug 18, 2009 at 10:49 AM, Marko Milivojevic <markom_at_markom.info > >wrote: > >> On Tue, Aug 18, 2009 at 14:34, Adrian<ccie2323_at_gmail.com> wrote: >>> dun think it will ever happen. unless for private AS. B Have 2 >>> remote >> sites >>> that is having the same as that transit a different AS in the >>> middle. >>> >>> AS100-AS200-AS100 >> >> This is actually somewhat common in MPLS VPN deployment scenarios. >> Imagine Enterprise (say with AS65000) that has MPLS provider with AS >> 65100. They have several sites and run BGP: >> >> (site1: AS65000) --- (MPLS: AS65100) --- (site2: AS65000) >> (site3: AS65000) ----^ >> >> As you can see, all customer sites are in AS65000. When update from >> site1 arrives to either site2 or site3, AS_PATH will look like "65001 >> 65000". Site2 will, of course, reject this as looped. >> >> One of the solutions how to overcome this situation is to use "bgp >> allowas-in". There are others, but they require configuration by >> service provider - who may be unwilling to change their >> configurations >> and let customers deal with their issues, without getting too >> involved. >> >> -- >> Marko >> CCIE #18427 (SP) >> My network blog: http://cisco.markom.info/ >> >> >> Blogs and organic groups at http://www.ccie.net >> >> _______________________________________________________________________ >> Subscription information may be found at: >> http://www.groupstudy.com/list/CCIELab.html >> >> >> >> >> >> >> >> > > > -- > Andrew Lee Lissitz > all.from.nj_at_gmail.com > > > Blogs and organic groups at http://www.ccie.net > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html Blogs and organic groups at http://www.ccie.netReceived on Tue Aug 18 2009 - 22:43:09 ART
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