From: Richard Dumoulin (richard.dumoulin@vanco.es)
Date: Sat Apr 17 2004 - 20:06:51 GMT-3
Hehe sorry, originally it was intended only for David.
Chuff,
Auto-RP
--R1 sends its RP announcements to the mapping agent R3 with destination IP
address 224.0.1.39 --> so verify rpf check failures on R3
--R3 sends its RP discoveries to all PIM routers with destination IP address
224.0.1.40 --> so verify rpf check failures on R1
This traffic is sent in PIM dense mode --> so an rpf check failure is
possible
----------------------------------------------------------------------------
----------------------------------------------------------------------------
--------------------------------------
BSR (http://www.faqs.org/rfcs/rfc2362.html
<http://www.faqs.org/rfcs/rfc2362.html> )
--The BSR candidate R3 sends its BSR messages (it is actually PIM) with
destination IP address 224.0.0.13 in a hop by hop manner --> it means that
all PIM routers will receive them and no rpf failure can occur
--The RP candidate sends its messages to the elected BSR to a unicast
destination IP address
This is only PIM or unicast traffic --> so no rpf failure will occur
because the source ip address will be on a directly connected network of the
receiving router
----------------------------------------------------------------------------
----------------------------------------------------------------------------
----------------------------------------
So I think I answered your question: "the RPF rule apply for both BSR and
AUTO-RP and if BSR works without the need of "ip mroute" why won't it work
with Auto-RP ?"
Here is the link to Cisco Multicast:
http://www.cisco.com/cgi-bin/Support/browse/psp_view.pl?p=Technologies:Multi
cast&viewall=true
<http://www.cisco.com/cgi-bin/Support/browse/psp_view.pl?p=Technologies:Mult
icast&viewall=true>
HTH
--Richard
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