From: Petr Lapukhov (petrsoft@gmail.com)
Date: Mon May 01 2006 - 09:48:19 ART
Basically, there are some important differences between AutoRP and BSR.
1) AutoRP uses two PIM Dense mode groups to collect and dessiminate
RP-to-groups
mapping information. So you need groups 224.0.1.39/40 to be in dense mode.
That's why you need either "pim sparse-dense mode" or "autorp listener + pim
sparse".
2) BSR on the other hand, floods it's announces hop-by-hop, using PIM
messages.
This flooding is constrained with RPF checks When RP hears BSR, it
_unicasts_
it's group set back to bootstrap router. BSR grabs that information, and
adds RP
to group set mappings to BSR announces.
3) With AutoRP mapping agent maps groups to RPs. With BSR every PIM router
receives full RPs to groups mappings list. And every router maps groups to
RPs on
it's own.
4) You may have multiple mapping agents with AutoRP. They just need to
announce
consistent mapping information. With BSR, a single bootstrap router is
elected.
If it fails, another candidate takes over BSR role.
HTH
Petr
2006/5/1, Kobus Van Rooyen <cciein2010@webmail.co.za>:
>
> My require assistance with above. When must one use
> BSR-candidate vs "ip pim send-rp-discovery" in multicast
> when asked to setup one router to be responsible for RP
> mappings?
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