H3C Technologies H3C SecPath F1000-E - Manual (Page 72)

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To do... Use the command... Remarks
Configure the interval between
MSDP peer connection retries
timer retry interval
Optional
30 seconds by default
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.
• Configuring basic functions of MSDP
Before configuring SA message delivery, prepare the following data:
• ACL rules for filtering SA request messages
• ACL rules as SA message creation rules
• ACL rules for filtering SA messages to be received and forwarded
• TTL threshold for multicast packet encapsulation in SA messages
• 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.
If the source-side RP is enabled to encapsulate register messages in SA messages, when there is a
multicast packet to deliver, the source-side RP encapsulates a register message containing the multicast
packet in an SA message and sends it out. After receiving the SA message, the remote RP
de-encapsulates the SA message and delivers the multicast data contained in the register message to the
receivers 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.
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 msdp —