Cisco Systems WSC4500X16SFP Manual De Usuario
24-12
Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter 24 Understanding and Configuring IP Multicast
Configuring IP Multicast Routing
Note
When PIM-SM routing is in use, the MFIB route might include an interface like in this example:
PimTunnel [1.2.3.4]. This is a virtual interface that the MFIB subsystem creates to indicate that packets
are being tunnelled to the specified destination address. A PimTunnel interface cannot be displayed with
the normal show interface command.
PimTunnel [1.2.3.4]. This is a virtual interface that the MFIB subsystem creates to indicate that packets
are being tunnelled to the specified destination address. A PimTunnel interface cannot be displayed with
the normal show interface command.
S/M, 224/4
An (S/M, 224/4) entry is created in the MFIB for every multicast-enabled interface. This entry ensures
that all packets sent by directly connected neighbors can be Register-encapsulated to the PIM-SM RP.
Typically, only a small number of packets would be forwarded using the (S/M,224/4) route, until the
(S,G) route is established by PIM-SM.
that all packets sent by directly connected neighbors can be Register-encapsulated to the PIM-SM RP.
Typically, only a small number of packets would be forwarded using the (S/M,224/4) route, until the
(S,G) route is established by PIM-SM.
For example, on an interface with IP address 10.0.0.1 and netmask 255.0.0.0, a route would be created
matching all IP multicast packets in which the source address is anything in the class A network 10. This
route can be written in conventional subnet/masklength notation as (10/8,224/4). If an interface has
multiple assigned IP addresses, then one route is created for each such IP address.
matching all IP multicast packets in which the source address is anything in the class A network 10. This
route can be written in conventional subnet/masklength notation as (10/8,224/4). If an interface has
multiple assigned IP addresses, then one route is created for each such IP address.
Unsupported Features
The following IP multicast features are not supported in this release:
•
Controlling the transmission rate to a multicast group
•
Load splitting IP multicast traffic across equal-cost paths
Configuring IP Multicast Routing
The following sections describe IP multicast routing configuration tasks:
•
•
•
For more detailed information on IP multicast routing, such as Auto-RP, PIM Version 2, and IP multicast
static routes, refer to the Cisco IOS IP and IP Routing Configuration Guide, Release 12.2.
static routes, refer to the Cisco IOS IP and IP Routing Configuration Guide, Release 12.2.