Cisco RF Gateway 1 Modules, Руководство по настройке

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GbE Interface Configuration
78-4025112-01 Rev H0 39
Multicast Join on Single Port
In this mode, the IGMP join will be sent only on the port where the stream is active.
If the stream is not available on both the ports then the IGMP will be sent on the port
which is currently being tried (as the stream will be toggled between both the ports).
This is mode is useful when the user wants to restrict the unnecessary traffic being
received.
Multicast Join on Both Ports
In this mode, the IGMP join is sent on both the ports of the pair irrespective of on
which port the stream is active. The switching time for stream, in case of loss, will be
improved when operating in dual join mode. Also the user can ascertain, from the
GUI pages, if the traffic is being received on the alternate port and is ready for
switchover in case of input loss.
Reversion of Multicast Stream to Primary Port
The ‘Stream Redundancy,’ as with the Ehternet Link + UDP/L2TPv3 traffic mode of
operation, does not support the reversion of Active port to Primary port.
But it supports the reversion of the multicast input streams to primary port,
manually. When this option is selected, all the multicast input streams that are active
on the backup port will be forced to become active on the primary port. If the stream
is not available on the primary port, it will again switch and become active on the
backup port. The user can also use the ‘Periodic revert to primary for multicast
streams’ option to schedule this operation hourly or weekly.
Source Specific Multicast operation in "Stream Redundancy" mode of operation
The SSM operation works slightly different from the 4-port independent mode and
the other Dual port pair modes.
Under this mode, since the traffic can be received on both ports of the pair, any
given source IP will be tried on both the ports before the other sources are tried.
For example, if a session is created on pair-1 with four sources configured, then the
RFGW-1 will try to bind the stream to the primary source on the primary port of
pair-1. If the source is available it will lock to it. But if it is not available, then it will
try to bind to the same primary source on the backup port. If the primary source is
not available on both the ports, the secondary source will first be tried on the
primary port and if it is not available then on the backup port. In this way, both
ports of the pair will be attempted before switching to the next source IP. The port
switching takes priority over the source switching when the RFGW-1 is operating in
the stream redundancy mode.