From: David Lonnie (david.lonnie@gmail.com)
Date: Fri Jul 11 2008 - 12:54:50 ART
Hi,experts:
I am confused with these 2 commands.
ip pim dm-fallback is enable by default.and it means,it will fallback to
dense-mode,regardless of interface mode configuration.
if this is right.so why need to configure ip pim autorp listener when using
sparse-mode?
anybody can clarify for me?
Thanks in advance.
David
ip pim autorp listener
To cause IP multicast traffic for the two Auto-RP groups 224.0.1.39 and
224.0.1.40 to be Protocol Independent Multicast (PIM) dense mode flooded
across interfaces operating in PIM sparse mode, use the ip pim autorp
listener command in global configuration mode. To disable this feature, use
the *no* form of this command.
ip pim dm-fallback
To enable Protocol Independent Multicast (PIM) dense mode (DM) fallback, use
the *ip pim dm-fallback* command in global configuration mode. To prevent
PIM dense mode fallback and to block all multicast traffic for groups not
specifically configured, use the *no* form of this command.
*ip pim dm-fallback *
*no ip pim dm-fallback *
Syntax Description
This command has no arguments or keywords.
Command 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.
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