M3SR Series 4100 Editing the Multicast Routing Table
5.86 Operating Manual 6175.4760.02 – 01
The TTL threshold of a multicast routing table entry defines the minimum TTL that incom-
ing packets must exceed in order to be forwarded.
In our example the initial value of the packet's TTL must be 3 in order to pass the first
hop (Radio1), since its matching multicast routing table entry has a configured TTL
threshold of 2. This value ensures that the packet has a large enough TTL to pass the
second hops (Radio2, 3, 4) on the way to its destinations.
There is nothing wrong in leaving the default TTL threshold of 1 unchanged, especially
when the entire network topology is unknown (like number of hops from source to desti-
nation).
A proper TTL threshold configuration can avoid an unnecessary forwarding of packets
whose (too small) TTL will cause next hop routers to drop them.
The necessary configuration for PC 1 to 4 is omitted.
Changing the Multicast Routing Table
Figure 5.23 IPoA Multicast Routing Menu
ICN-4D-G-231051-R-D0894-00003-A-01-1
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