Subscriber Services
7750 SR OS Services Guide Page 159
no version
Context config>service>pw-template>igmp-snooping
Description This command specifies the version of IGMP. This object can be used to configure a router capable of
running either value. For IGMP to function correctly, all routers on a LAN must be configured to run
the same version of IGMP on that LAN.
When the send-query command is configured, all type of queries generate ourselves are of the
configured version. If a report of a version higher than the configured version is received, the report
gets dropped and a new “wrong version” counter is incremented.
If the send-query command is not configured, the version command has no effect. The version used
on that SAP or SDP will be the version of the querier. This implies that, for example, when there is a
v2 querier, a v3 group or group-source specific query when a host wants to leave a certain group will
never be sent.
Parameters version — Specify the IGMP version.
Values 1, 2, 3
split-horizon-group
Syntax [no] split-horizon-group [group-name] [residential-group]
Context config>service>pw-template
Description This command creates a new split horizon group (SGH).
Comparing a “residential” SGH and a “regular” SHG is that a residential SHG:
• Has different defaults for the SAP/SDP that belong to this group (ARP reply agent enabled (SAP
only), MAC pinning enabled). These can be disabled in the configuration.
• Does not allow enabling spanning tree (STP) on a SAP. It is allowed on an SDP.
• Does not allow for downstream broadcast (broadcast / unknown unicast) on a SAP. It is allowed
on an SDP.
• On a SAP, downstream multicast is only allowed when IGMP is enabled (for which an MFIB
state exists; only IP multicast); on a SDP, downstream mcast is allowed.
When the feature was initially introduced, residential SHGs were also using ingress shared queing by
default to increase SAP scaling.
A residential SAP (SAP that belongs to a RSHG) is used to scale the number of SAPs in a single
VPLS instance. While for regular SAPs, there is a limit of 127 SAPs/VPLS, for residential SAPs,
scaling can be preformed e up to 4K SAPs/VPLS (there is no need for multicast replication on
residential SAPs). Therefore, residential SAPs are usefull in residential aggregation environments
(for example, triple play networks) with a VLAN/subscriber model.
The no form of the command removes the group name from the configuration.
Parameters group-name — Specifies the name of the split horizon group to which the SDP belongs.
residential-group — Defines a split horizon group as a residential split horizon group (RSHG). Doing
so entails that:
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