Key Differences in Multicast Stub Routing
IP Multicast Stub Routing in AOS
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Copyright © 2005 ADTRAN, Inc.
61200890L1-29.3A
Key Differences in Multicast Stub Routing
The key differences between AOS multicast stub routing and that of some other common product
operating systems are as follows:
•
In AOS, the multicast helper address is a single global setting. Each downstream interface can be
configured to use or not use IGMP forwarding. In some other products, each interface may have a
separate helper address specified.
•
With other products that use multicast stub functionality, PIM must still be turned on to enable
multicast forwarding on all involved interfaces and to enable IGMP on downstream interfaces. In
AOS, multicast stub operation has unique commands that enable only the functions necessary for
multicast stub operation (wasting no CPU, memory, or bandwidth resources on a routing protocol
that is hardly used).
•
In some other products, the upstream peer router must also have PIM enabled and in certain modes
must be configured to filter PIM from the stub routers (preventing it from forming a PIM
relationship with the stub router). Again, AOS only invokes the processes needed for multicast stub
operation.
