around the perimeter of their networks. This boundary prevents multicast traffic in the range of 239.128.0.0
through 239.128.255.255 from entering or leaving their respective networks.
Figure 13: Administratively-Scoped Boundaries
You can define an administratively-scoped boundary on a routed interface for multicast group addresses. A
standard access list defines the range of addresses affected. When a boundary is defined, no multicast data
packets are allowed to flow across the boundary from either direction. The boundary allows the same multicast
group address to be reused in different administrative domains.
The IANA has designated the multicast address range 239.0.0.0 to 239.255.255.255 as the
administratively-scoped addresses. This range of addresses can then be reused in domains administered by
different organizations. The addresses would be considered local, not globally unique.
Related Topics
Configuring an IP Multicast Boundary (CLI), on page 265
Example: Configuring an IP Multicast Boundary, on page 272
Multicast Routing and Device Stacks
For all multicast routing protocols, the entire stack appears as a single router to the network and operates as
a single multicast router.
In a device stack, the active device performs these functions:
•
It is responsible for completing the IP multicast routing functions of the stack. It fully initializes and
runs the IP multicast routing protocols.
•
It builds and maintains the multicast routing table for the entire stack.
•
It is responsible for distributing the multicast routing table to all stack members.
The stack members perform these functions:
•
They act as multicast routing standby devices and are ready to take over if there is a active device failure.
If the active device fails, all stack members delete their multicast routing tables. The newly elected active
device starts building the routing tables and distributes them to the stack members.
•
They do not build multicast routing tables. Instead, they use the multicast routing table that is distributed
by the active device.
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3650 Switches)
OL-29890-01 255
Configuring IP Multicast Routing
Multicast Routing and Device Stacks
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