From: TAN CHOH KOON (tckoon@pc.jaring.my)
Date: Mon Aug 09 2004 - 12:49:24 GMT-3
Hi Chris,
Look at this statement from the link you send me. There are different
behaviour between normal interface and VRF enable iterface.
By default, PIM dense mode fallback is enabled. That is, a multicast group
in the absence of rendezvous
point (RP) information will fall to dense mode, ** regardless of the
interface mode configuration.***
However, if all of the interfaces in a VRF are configured with PIM sparse
mode, no dense mode fallback
is achieved by default. If all of the interfaces are already configured as
sparse, even though the group mode falls to dense mode, the traffic does not
get flooded (due to the sparse characteristic of the interface). But the
established flows might be torn down and the state of the network could
become
indeterministic. The main advantage of no dense mode fallback in this case
would be deterministic
behavior.
Regards.
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