Cobalt Digital COMPASS 9220 Bidirectional ASI_MPTS Gateway - Manual (Page 27)

27 9220-UM V1.1
The Primary/Backup addressing parameters are configured as follows:
•
UDP Port: selects the UDP port to receive from. Valid values are between 1 and 65535.
Note that, in traditional IP networks, UDP ports between 1 and 1023 are reserved for
administrative uses. It is recommended to use UDP ports 1024 and higher. The 9220,
however, will accept any legal value.
•
Reception: selects the address to receive from. The options are:
o Unicast: the packets are being sent to the IP address of this Ethernet port. The
address of the Ethernet port can be set or reviewed in the Network Tab.
o Multicast: the packets are being sent to a Class-D multicast address (between
224.0.0.0 and 239.255.255.255). If this option is selected, a new field is
displayed to accept the multicast address:
The 9220 will warn the user if the address entered in this field is not a multicast
address. The device includes a full implementation of IGMP V1/V2/V3 to
convey group membership information to upstream routers; IGMP is configured
in the Network Tab.
o Broadcast: the packets are being sent to a broadcast address (either the all-hosts
broadcast address of 255.255.255.255 or a subnet broadcast address). Note that
this is extremely rare in practice.
•
Source: If desired, the 9220 can filter packets by source IP address. This is useful when
the network includes a primary and a backup stream, sent to the same address, but from
different sources. The options are:
o Any Address: this input will accept packets from any address.
o Specific Address: this input will only accept packets from a given specific
address. When this option is selected, a new field appears where the desired
source IP address can be entered:
Unicast/Broadcast Multicast Unicast/Broadcast Multicast
The Source Address must be a valid unicast address. In case of Multicast
reception, the 9220 will go into SSM (Source-Specific Multicast) mode. If IGMP
V3 is in use, the card will use it to inform the network of the choice selection.
Note that the 9220 does not require an IGMP V3 network to operate in SSM
mode, as it can filter packets in real-time at line rate.