Harmonic ELECTRA VS, User Manual

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Appendix F ’Network Settings’ — Hardware Delivery - 6RU and 10RU devices
Electra VS - Version 05.10 579
User Manual - Rev. A
Multicast Management
IGMP snooping is enabled on the two Flex10, with the default time-out of
260 seconds.
IGMP snooping must not be disabled as it is mandatory on the
Internal data network. If disabled, the system will not be operational.
To ensure a proper multicast management, the network must contain an
IGMP Querier. You must thus ensure that one of your switches acts as
such (the Flex10 cannot have this role).
External LANs are configured as private networks , which forbids any
traffic between blades. In an IP TV environment, this prevents from
flooding a multicast stream in output of a blade towards all the other
blades.
Heterogeneous System Configuration
It is possible to link blade centers and 1RUs via an external 1 Gbps
switch, at least considering the system private LAN.
To ensure a proper multicast management in the system private LAN, it
must contain an IGMP Querier. You must thus ensure that one of your
switches acts as such. The IP source of the IGMP querier shall exist in the
system private LAN.
Figure F-1. Linking blade centers via an external 1 Gbps switch