Westermo U200 Operator manal - Manual (Page 29)

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measurements reports according to IGMP v2. IP multicast producers are not required to
make an IGMP join during start up or answer with IGMP measurement reports on received
IGMP query packets (ref. RFC 2236).
10.3 Stop filter option
A stop filter will be set if a multicast packet is received prior to a "join" to an IP multicast group
where the received multicast address belong if the "Multicast stop filter" option is enabled.
This means that IP multicasting based on IGMP is required in order to get multicast through
the network. Multicast filters will be properly set only for IP multicast packets if this option is
disabled. That means that multicast packets not based on IP will be forwarded in the same
way as broadcast packets. This is acceptable if the non IP based multicast network load is
reasonable low.
10.4 Fast MC filter setup
Version 3.65 and newer versions have the following property:
- All trunk ports (i.e. RSTP or FRNT trunk ports), manually defined layer IGMP trunk ports
and the query port(s) are by default member of all MC filters.
- MC data generated by MC producers that do not generate IGMP measurement Reports
will be forwarded on all trunk ports (i.e. RSTP or FRNT trunk ports), manually defined
layer IGMP trunk ports and the query port(s).
These the two new IGMP snooping properties can be enabled or disabled in SNMP in the
private MIB:
includeIgmpL2TrunkPortsOnAllMcfilters (1.3.6.1.4.1.16177.1.1.7.7).
10.5 FRNT integration
The IP multicast filter implementation is integrated with the Fast Re-configuration of Network
Topology (FRNT) protocol. This means that the multicast filters will be updated as fast the
FRNT implementation handles a topology change, i.e. approx. 30 ms.