multicast strict sparse-mode. (S,G) shows up everywhere while

From: johngibson1541@yahoo.com
Date: Tue Feb 06 2007 - 05:17:46 ART

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I know (S,G) will still exist in the path from the source to RP even in strict sparse-mode.

In my home lab, only (*,G) is populated from the destination to the RP before I actually send ping, everything seems correct until I actually sent ping from source to destination.

Once I actually send ping from the source to the destination. (S,G) just shows up in every router along the path.

After the ping. If I wait for a few minutes, the extra (S,G) will disappear, everything comes back to normal.

Is this normal ?

My doubt is that if (S,G) will be everywhere when the multicast application is sending packets, then sparse-mode is not superior than dense-mode at all if only consider keeping the mroute table small.

So, in concern of keeping the mroute table small, sparse-mode is superior only if the applications don't constantly send data.

John

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