Configuring Sa Request Messages - H3C S3610-28P Operation Manual

Operation Manual – Multicast Protocol
H3C S3610&S5510 Series Ethernet Switches
message containing the multicast packet in an SA message and sends it out. After
receiving the SA message, the remote RP 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:
Enter system view
Enter MSDP view
Enable encapsulation of a
register message
Configure the interface
address as the RP
address in SA messages

7.5.3 Configuring SA Request Messages

By default, upon receiving a new Join message, a router does not send an SA request
message to its designated 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:
Enter system view
Enter MSDP view
Enable the device to send
SA request messages
To do...
system-view
msdp
encap-data-enable
originating-rp
interface-type
interface-number
To do...
system-view
msdp
peer peer-address
request-sa-enable
Use the command...
Use the command...
7-14
Chapter 7 MSDP Configuration
Remarks
—
—
Optional
Disabled by default
Optional
PIM RP address by
default
Remarks
—
—
Optional
Disabled by default