14215700-IG, Edition 8.0
April 2018, Original document
126
Using Multicast
Spectralink IP-DECT Base Stations will use IP multicast signaling in two different configurations;
LAN based synchronization and if using more than 256 Spectralink IP-DECT Base Stations.
LAN Based Synchronization
l LAN Synchronisation uses the PTP protocol.
l The PTP multicast is non-routable and TTL is static = 1.
l The multicast IP address is fixed and uses 224.0.1.129
l It is not possible to configure any of these parameters
When a Spectralink IP-DECT Base Station is connected to a switch port it will announce itself by
IGMPv3 (Internet Group Management Protocol). The Spectralink IP-DECT Base Station will then
send a Membership report/Join group.
Installation of more than 256 Spectralink IP-DECT Base Stations
When more than 256 Spectralink IP-DECT Base Stations is connected to a Spectralink IP-DECT
6500 Server, it is required to enable Multicast signaling.
l Multicast for more than 256 Spectralink IP-DECT Base Stations is routable and configurable.
l TTL is default set to 1 but can be changed according to network topology.
l The multicast IP address is configurable, default value is 239.255.1.11
Note:
The multicast implementation for more 256 base Spectralink IP-DECT Base Stations is
designed for the scalability of large networks. Though multicast is required when using
more than 256 Spectralink IP-DECT Base Stations it is also possible to use it on fewer
Spectralink IP-DECT Base Stations.
When a Spectralink IP-DECT Base Station is connected to a switch port it will announce itself by
IGMPv3 (Internet Group Management Protocol). The Spectralink IP-DECT Base Station will then
send a Membership report/Join group.
Note:
When using IGMP snooping for managing the multicast traffic in the network infra-
structure, it may be required to have an IGMP querier running on the network for proper
multicast operation. Please consult the network equipment documentation for more
information.
Every 60 second, the Spectralink IP-DECT Server will send a keep alive signal IP-DECT Server ->
239.255.1.11:56001
If the system is redundant, the keep alive will be sent from the backup Spectralink IP-DECT Server
as well.
Spectralink IP-DECT Server 200/400/6500 Installation and Configuration Guide
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