203
Step Command
Remarks
2.
Enter public network MSDP view
or VPN instance MSDP view.
msdp
[
vpn-instance
vpn-instance-name
]
N/A
3.
Enable encapsulation of multicast
data in SA messages.
encap-data-enable
Optional.
Disabled by default.
4.
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
CAUTION:
Before you can enable the device to send SA requests, be sure to disable the SA message cache
mechanism.
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 reduce the join latency, you can configure routers to send SA request messages to the designated
MSDP peers after receiving a join message of a new receiver.
To configure SA message transmission and filtering:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter public network MSDP
view or VPN instance MSDP
view.
msdp
[
vpn-instance
vpn-instance-name
]
N/A
3.
Enable the device to send SA
request messages.
peer
peer-address
request-sa-enable
Optional.
Disabled by default.
4.
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.
Configuring SA message filtering rules
Through an SA message creation rule, you can enable the router to filter the (S, G) entries to be
advertised when creating an SA message. This allows the propagation of messages of multicast
sources to be controlled.
Through 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. This
controls the propagation of multicast source information at SA message reception or forwarding.
A TTL threshold for multicast data packet encapsulation in SA messages can control the multicast
data packet encapsulation in SA messages and limit the propagation range of SA messages:
•
Before creating an SA message with an encapsulated multicast data packet, the router
examines the TTL value of the multicast data packet. If the TTL value is less than the threshold,
the router does not create an SA message. If the TTL value is greater than or equal to the
