Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapping-01.txt
Leonard Giuliano <lenny@juniper.net> Thu, 02 July 2009 19:11 UTC
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Date: Thu, 02 Jul 2009 11:59:35 -0700
From: Leonard Giuliano <lenny@juniper.net>
To: "Andy Kessler (kessler)" <kessler@cisco.com>
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Cc: pim@ietf.org
Subject: Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapping-01.txt
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Andy- to be clear, last year I suggested deprecating BSR, not just the hash, as Static Anycast is a much better approach. However, if you are unwise enough to use BSR, the hash doesn't seem like a terribly offensive way to load balance among multiple RPs. I am not following you on the problem with the hash's applicability to other mechanisms. The hash is just a tiebreaker within the BSR mechanism. I don't see why it needs to be applicable to static or Auto-RP, just as local-pref is only applicable to BGP and means nothing to ISIS/OSPF/Static/etc. What am I missing? On Wed, 1 Jul 2009, Andy Kessler (kessler) wrote: -) -) Hi Lenny, -) -) Routers can learn group to RP mapping information from several sources -) including statically assigned, BSR, AutoRP and embedded RP. The purpose -) of this draft is to develop a deterministic way to select a particular -) mapping when we have a conflict. It doesn't have anything to do with -) advertising those mappings. -) -) The problem with the hash function is that it only applies to BSR. How -) do you apply the hash across static RP or any of the other methods ? We -) debated at one point in saying that the BSR code itself could use the -) hash and then decide which mappings it would present to the common -) group to RP mapping table. Then we thought it would be best just to -) drop it and recommend Anycast RP. We discussed this on the list. -) -) Last year about this time you said that you agreed that Anycast is a -) better method for load balancing than the hashing function. You still -) agree with that, right ? -) -) I personally would never implement a network with the BSR hash. I'd -) want to which RP was responsible for which group - even if there was -) load sharing with Anycast. -) -) Andy -)
- [pim] I-D ACTION:draft-ietf-pim-group-rp-mapping-… Internet-Drafts
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… John Zwiebel
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… Andy Kessler (kessler)
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… Stig Venaas
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… Leonard Giuliano
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… Andy Kessler (kessler)
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… Leonard Giuliano
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… Andy Kessler (kessler)
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… Andy Kessler (kessler)
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… John Zwiebel
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… Stig Venaas
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… John Zwiebel
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… Andy Kessler (kessler)
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… Stig Venaas
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… Andy Kessler (kessler)
- Re: [pim] I-D ACTION:draft-ietf-pim-group-rp-mapp… Stig Venaas