Configuring Sa Request Messages; Configuring Sa Message Filtering Rules - HP A5500 SI Switch Series Configuration Manual

The MSDP peers deliver SA messages to one another. After receiving an SA message, a switch performs
RPF check on the message. If the switch finds that the remote RP address is the same as the local RP
address, it discards the SA message. In the Anycast RP application, however, you must configure RPs
with the same IP address on two or more devices in the same PIM-SM domain and configure these
devices 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...
Enter system view
Enter public network MSDP view or
VPN instance MSDP view
Enable encapsulation of a register
message
Configure the interface address as the
RP address in SA messages

Configuring SA request messages

By default, after receiving a new join message, a switch does not send an SA request message to any
MSDP peer. Instead, it waits for the next SA message from its MSDP peer. This causes 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, configure devices 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...
Enter system view
Enter public network MSDP view or
VPN instance MSDP view
Enable the device to send SA request
messages
Configure a filtering rule for SA
request messages
CAUTION:
Before you 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 switch 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.
Use the command...
system-view
msdp [ vpn-instance vpn-instance-
name ]
encap-data-enable
originating-rp interface-type
interface-number
Use the command...
system-view
msdp [ vpn-instance vpn-instance-
name ]
peer peer-address request-sa-
enable
peer peer-address sa-request-
policy [ acl acl-number ]
200
Remarks
—
—
Optional
Disabled by default
Optional
PIM RP address by default
Remarks
—
—
Optional
Disabled by default
Optional
SA request messages are not
filtered by default