H3C Technologies H3C S10500 Series Switches - Manual (Page 230)

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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 public network MSDP view or
VPN instance MSDP view msdp [ vpn-instance
vpn-instance-name ]
—
Enable encapsulation of multicast data
in SA messages
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, after 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 after 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 public network MSDP view or
VPN instance MSDP view
msdp [ vpn-instance
vpn-instance-name ]
—
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
CAUTION:
Before you can enable the device to send SA requests, be sure to disable the SA message cache
mechanism.
Configuring SA message filtering rules
By configuring an SA message creation rule, you can enable the router to filter the (S, G) entries to be
advertised when creating an SA message, so that the propagation of messages of multicast sources is
controlled.
By configuring a filtering rule for receiving or forwarding SA messages, you can enable the router to filter
the (S, G) forwarding entries to be advertised when receiving or forwarding an SA message, so that the
propagation of multicast source information is controlled at SA message reception or forwarding.