On Sun, May 24, 2009 at 8:11 AM, Kim Pedersen <[email protected]> wrote:
> Hi, > > Thanks for the reply. > > I guess what im asking is, will an (S,G) entry always point to the SPT, > and in that regard, will only be present after a SPT switchover? Is it > possible to define it such that traffic will always flow through the RP (and > again, not create any (S,G) entries)? > > This would be a good time to learn when and why an (S,G) entry is created. It is created because of an (S,G) join which happens during the SPT switchover or when the RP joins the SPT to the source. If you disable the SPT switchover, you wont see the (S,G) if you are on the path below (downstream from) the RP. You will still see T bit set on the flow from source to the RP however. There is a great explanation in the Beau Williamson book "Developing IP Multicast Networks." -- Bryan Bartik CCIE #23707 (R&S), CCNP Sr. Support Engineer - IPexpert, Inc. URL: http://www.IPexpert.com
