Configuring Sa Messages Related Parameters - HP A8800 Configuration Manual

Step
5. Configure an MD5
authentication password for
the TCP connection to be
established with an MSDP
peer.

Configuring SA messages related parameters

Configuration prerequisites
Before configuring SA message delivery, complete the following tasks:
Configure any unicast routing protocol so that all devices in the domain are interoperable at the
•
network layer.
Configure basic MSDP functions.
•
• Determine the ACL for filtering SA request messages.
Determine the ACL for creating SA messages.
•
Determine the ACL for filtering SA messages to be received and forwarded.
•
• Determine the TTL threshold for multicast packets encapsulation in SA messages.
Determine the maximum number of (S, G) entries learned from the specified MSDP peer that the
•
router can cache.
Configuring SA message content
Some multicast sources send multicast data at an interval longer than the aging time of (S, G) entries. In
this case, the source-side DR has to encapsulate multicast data packet by packet in register messages
and send them to the source-side RP. The source-side RP transmits the (S, G) information to the remote RP
through SA messages. Then the remote RP joins the source-side DR and builds an SPT. Since the (S, G)
entries have timed out, remote receivers can never receive the multicast data from the multicast source.
After the source-side RP is enabled to encapsulate multicast data in SA messages, if the RP wants to sends
a multicast packet, it encapsulates a multicast packet in an SA message and sends it out. After the remote
RP receives the SA message, it de-encapsulates the SA message and delivers the multicast packet to the
receivers in the local domain 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.
To configure the SA message content:
Step
1. Enter system view.
Command
peer peer-address password
{ cipher cipher-password | simple
simple-password }
Command
system-view
197
Remarks
Optional.
By default, MD5 authentication is
not performed before a TCP
connection is established.
Remarks
N/A