HP VPN Firewall Appliances Network Management Configuration Guide

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The MSDP peers deliver SA messages to one another. After 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 discards the SA message. However, in the Anycast RP application, you must 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 logical RP address (namely, the RP address on the logical
interface) that is different from the actual RP address must be designated for SA messages so that the
messages can pass the RPF check.
To configure the SA message content:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter public network MSDP view.
msdp 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
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 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.
IMPORTANT:
Before you enable the device to send SA requests, be sure to disable the SA messa
g
e cache mechanism.
To configure SA message transmission and filtering:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter public network MSDP view.
msdp
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
An SA message creation rule enables the router to filter the (S, G) entries to be advertised when the router
creates an SA message. This controls the propagation of messages of multicast sources.