Ericsson ECN330, User Manual

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Configuring the ECN330-switch
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1553-KDU 137 365 Uen D 2006-06-16
• By default, the ECN330-switch sends join/prune messages every
60 seconds to inform other PIM-SM routers about clients who want
to join or leave a multicast group.
• Use the same join/prune message interval on all PIM-SM routers in
the same PIM-SM domain, otherwise the routing protocol’s
performance will be adversely affected.
• The multicast interface that first receives a multicast stream from a
particular source forwards this traffic only to those interfaces on the
router that have requests to join this group. When there are no
longer any requesting groups on that interface, the leaf node sends
a prune message upstream and enters a prune state for this
multicast stream. The protocol maintains both the current join state
and the pending RPT prune state for this (source, group) pair until
the jp-interval timer expires.
• Register Rate Limit – Configures the rate at which register messages
are sent by the Designated Router (DR) for each (source, group) entry.
(Range: 1-65535: Default: 0, which means no limit)
This parameter can be used to relieve the load on the DR and RP.
However, because register messages exceeding the limit are dropped,
some receivers may experience data packet loss within the first few
seconds in which register messages are sent from bursty sources.
• Register Suppression – Configures the register suppression timer on
a DR or the keep alive time on an RP. This timer is used to calculate the
period during which a DR stops sending register-encapsulated data to
the RP after receiving a RegisterStop message. It is also used to
calculate the KeepaliveTimer by the RP. (Range: 1-65535 seconds;
Default: 60 seconds)
• When the DR receives a register-stop message from the RP, it uses
the register suppression time to set the register-stop timer. It then
stops sending register messages and starts the register-stop timer
for the specified group. Afterwards, the DR periodically sends a null-
register message to the RP to determine whether or not the RP
wants to start receiving normal register messages for this group.
• When the RP receives a register message for a source for any
group, it uses the register suppression time to set the keep-alive
timer for that group source.