User's Manual

User’s Manual of SGS-5240 Series Managed Switch
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4.2.14.1 Configure Global
Switch Management > MVR for IPv4 >Configure Global page is used to configure proxy switching and the robustness variable.
◆Proxy Switching – Configures MVR proxy switching, where the source port acts as a host, and the receiver port acts as an
MVR router with querier service enabled. (Default: Enabled)
 When MVR proxy-switching is enabled, an MVR source port serves as the upstream or host interface, and the MVR
receiver port serves as the querier. The source port performs only the host portion of MVR by sending summarized
membership reports, and automatically disables MVR router functions.
 Receiver ports are known as downstream or router interfaces. These interfaces perform the standard MVR router
functions by
 maintaining a database of all MVR subscriptions on the downstream interface. Receiver ports must therefore be
configured on all downstream interfaces which require MVR proxy service.
 When the source port receives report and leave messages, it only forwards them to other source ports.
 When receiver ports receive any query messages, they are dropped.
 When changes occurring in the downstream MVR groups are learned by the receiver ports through report and leave
messages, an MVR state change report is created and sent to the upstream source port, which in turn forwards this
information upstream.
 When MVR proxy switching is disabled:
 Any membership reports received from receiver/source ports are forwarded to all source ports.
 When a source port receives a query message, it will be forwarded to all downstream receiver ports.
 When a receiver port receives a query message, it will be dropped.
◆Robustness Value – Configures the expected packet loss, and thereby the number of times to generate report and
group-specific queries. (Range: 1-255; Default: 2)
 This parameter is used to set the number of times report messages are sent upstream when changes are learned
about downstream groups, and the number of times group-specific queries are sent to downstream receiver ports.
 This parameter only takes effect when MVR proxy switching is enabled.
◆Proxy Query Interval – Configures the interval at which the receiver port sends out general queries. (Range: 2-31744
seconds; Default: 125 seconds)
 This parameter sets the general query interval at which active receiver ports send out general queries.
 This interval is only effective when proxy switching is enabled.
◆Source Port Mode – Configures the switch to forward any multicast streams within the parameters set by a profile, or to only
forward multicast streams which the source port has dynamically joined.
 Always Forward – By default, the switch forwards any multicast streams within the address range set by a profile,
and bound to a domain. The multicast streams are sent to all source ports on the switch and to all receiver ports that
have elected to receive data on that multicast address.