All things related to multicast

[John Zwiebel <>]

On 9/4/02 9:38 AM, "Tim Ward" 
<>
 wrote:

> 
> Currently you have three options that I know of for RP:
> 
> Auto-RP -- cisco specific requires PIM sparse-dense within a PIM domain

  sparse-dense is not required if there is a "default" RP statically
  configured on every router.

> BSR -- not cisco specific allows for PIM sparse within a PIM domain
> Anycast RP -- not cisco specific but requires MSDP between RPs
>

"Anycast RP" isn't exactly an option.  What it is is a way of
 splitting up the RP load.  Auto-RP and BSR can be used to
 distribut that address to all routers in the network, but
 few (if any) networks do this.  Rather a static RP is used.

FWIW: only widely distributed networks (ie a tier-1 ISP) need
 consider any-cast RP.  Because ISPs are concerned with reliability
 over flexibility, they choose one IP address to handle -all-
 multicast groups (also there's no advantage for scoping), that
 address will still be valid for years, so there is no need to
 consider the BSR or auto-rp and configuration of a static RP
 makes a lot of sense.

A widely disbursed enterprise -might- want to take advantage of
 anycast-RP, but might find the flexibility of auto-RP/BSR is
 also required.

90% of the folks reading this have little use for any of this info.

  ;-)