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DES-7200 Configuration Guide Chapter 6 PIM-SM
Configuration
6-3
PIMv2 router receives the message, it multicasts it while setting the TTL to 1. In
this way, the BSR message is received by all devices hop-by-hop. Since the
message contains the IP address of the BSR, the candidate BSR can know which
router is the current RP based on this message. The candidate RPs send
candidate RP advertisements to announce in which address ranges they can
become an RP. The BSR stores them in its local candidate RP cache. The BSP
notifies all PIM routers of its local candidate RPs periodically. These messages
reach various devices hop-by-hop in the same way.
6.2 Configuration Preparation
Before configuring the PIM-SM, you shall enable a unicast routing protocol to find
the routing automatically.
6.3 PIM-SM Configuration Task
The PIM-SM configuration covers the following items. However, only the first one
is mandatory, and others are optional.
6.3.1 Configuring Multicast Routing
Multicast packets can be forwarded only after multicast routing is enabled and
enabling PIM-SM makes sense.
To enable multicast routing, run the following command in the global configuration
mode.
Command Function
ip multicast-routing
Enable multicast routing globally.
no ip multicast-routing
Disable multicast routing globally.
6.3.2 Enabling PIM-SM
The PIM-SM must be enabled on every port. Only after the PIM-SM is enabled on
its ports can the device exchange PIM-SM control messages with other devices,
maintain and update multicast routing table, and forward multicast packets.
To enable the PIM-SM on the interface, execute the following command in the
interface mode:
Command Function
DES-7200(config-if)# ip pim sparse-mode
Enable the PIM-SM protocol on the
interface.
DES-7200(config-if)# no ip pim
sparse-mode
Disable the PIM-SM protocol on the
interface.
Note
Enabling the PIM-SM on the interface takes effect only when the multicast
routing is enabled in the global configuration mode.
When the system prompts "Failed to enable PIM-SM on <Interface Name>,
resource temporarily unavailable, please try again", re-execute this command.
When the system prompts "PIM-SM Configure failed! VIF limit exceeded in
NSM!!!", it indicates that the configured interfaces exceed the upper limit of the
multicast interfaces. In this case, delete the unnecessary PIM-SM interfaces.
It is not recommended to configure different IPv4 multicast protocols on
different interfaces of a switch/router.