H3C LS-3100-52P-OVS-H3 Operation Manual - page 1019
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decapsulates the SA message and delivers the multicast data contained in the register message to the
receivers along the RPT.
The MSDP peers deliver SA messages to one another. Upon receiving an SA message, a router
performs RPF check on the message. If the router finds that the remote RP address is the same as the
local RP address, it will discard the SA message. In the Anycast RP application, however, you need to
configure RPs with the same IP address on two or more routers in the same PIM-SM domain, and
configure these routers as MSDP peers to one another. Therefore, a logic RP address (namely the RP
address on the logic interface) that is different from the actual RP address must be designated for SA
messages so that the messages can pass the RPF check.
Follow these steps to configure the SA message content:
To do...
Use the command...
Remarks
Enter system view
system-view
—
Enter MSDP view
msdp
—
Enable encapsulation of a register
message
encap-data-enable
Optional
Disabled by default
Configure the interface address as
the RP address in SA messages
originating-rp interface-type
interface-number
Optional
PIM RP address by default
Configuring SA Request Messages
By default, upon receiving a new Join message, a router does not send an SA request message to any
MSDP peer; instead, it waits for the next SA message from its MSDP peer. This will cause the receiver
to delay obtaining multicast source information. To enable a new receiver to get the currently active
multicast source information as early as possible, you can configure routers to send SA request
messages to the designated MSDP peers upon receiving a Join message of a new receiver.
Follow these steps to configure SA message transmission and filtering:
To do...
Use the command...
Remarks
Enter system view
system-view
—
Enter MSDP view
msdp
—
Enable the device to send SA
request messages
peer peer-address
request-sa-enable
Optional
Disabled by default
Configure a filtering rule for SA
request messages
peer peer-address
sa-request-policy [ acl
acl-number ]
Optional
SA request messages are
not filtered by default
Before you can enable the device to send SA requests, be sure to disable the SA message cache
mechanism.