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Setting Up IP Multicast Forwarding
Configuring multicast forwarding
Implicit priority setting for dropping multicast packets
For high-bandwidth data, voice, and audio multicast applications, the MAX supports
prioritized packet dropping. If the MAX is the receiving device under extremely high loads, it
drops packets according to a priority ranking, which the following UDP port ranges determine:
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Monitoring connectivity problems through heartbeat monitoring
When running as a multicast forwarder, the MAX continually receives multicast traffic.
Heartbeat-monitoring is an optional feature enables the administrator to monitor possible
connectivity problems by continuously polling for this traffic and generating an SNMP alarm
trap in the event of a traffic breakdown. Following is the SNMP alarm trap:
Trap type: TRAP_ENTERPRISE
Code: TRAP_MULTICAST_TREE_BROKEN (19)
Arguments:
1) Multicast group address being monitored (4 bytes),
2) Source address of last heartbeat packet received (4 bytes),
3) Slot time interval configured in seconds (4 bytes),
4) Number of slots configured (4 bytes),
5) Total number of heartbeat packets received before the MAX started
sending SNMP Alarms (4bytes).
To set up heartbeat monitoring, you configure several parameters that define the packets to be
monitored, how often and for how long to poll for multicast packets, and the threshold for
generating an alarm. Following are the parameters you use to specify these settings:
Setting
Packets to be monitored
How often and for how long
to poll for multicast packets
10-4
Traffic on ports 0–16384 (unclassified traffic) has the lowest priority (50).
Traffic on ports 16385–32768 (audio traffic) has the highest priority (70).
Traffic on ports 32769–49152 (whiteboard traffic) has medium priority (60).
Traffic on ports 49153–65536 (video traffic) has low priority (55).
Parameters
HeartBeat Address specifies a multicast address. If set, causes
the MAX to listen for packets to and from the specified
address.
HeartBeat UDP Port specifies a UDP port number. If set,
causes the MAX to listen only to packets received through the
specified port.
Source Addr and Source Mask specify an IP address and sub-
net mask. If you specify an address, the MAX ignores packets
from that source for monitoring purposes.
HeartBeat Slot Time specifies an interval (in seconds). The
MAX polls for multicast traffic, waits for the duration of the
interval, then polls again.
HeartBeat Slot Count specifies how many times to poll before
comparing the number of heartbeat packets received to the
Alarm Threshold.
MAX 6000/3000 Network Configuration Guide
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