Huawei quidway s7700 - Encapsulating a Multicast Data Packet in an SA Message

After the function of encapsulating a multicast packet in an SA message is enabled on the source
RP, the source RP encapsulates multicast data in SA messages and sends them out. After
receiving an SA message, a remote RP decapsulates the message and forwards the multicast data
to users in the domain along the RPT.
Setting the TTL threshold can limit the transmission scope of a multicast packet contained in an
SA message. After receiving an SA message containing a multicast packet, an MSDP peer checks
the TTL value in the IP header of the multicast packet. If the TTL value is smaller than or equal
to the threshold, the MSDP peer does not forward the SA message to a specific remote peers. If
the TTL value is greater than the threshold, the MSDP peer reduces the TTL value in the IP
header of the multicast packet by 1, and then encapsulates the multicast packet in an SA message
and sends it out.
Pre-configuration Tasks
Before transmitting burst multicast data between domains, complete the following tasks:
l Configuring a unicast routing protocol to implement interconnection at the network layer
l Enabling IP multicast
l Configuring a PIM-SM domain to implement intra-domain multicast
l Configuring PIM-SM Inter-domain Multicast or Configuring an Anycast RP in a
PIM-SM Domain
Data Preparation
To transmit burst multicast data between domains, you need the following data.
No.
Data
1 TTL threshold for forwarding an SA message containing a multicast data packet
2 Address of a remote MSDP peer
7.8.2 Encapsulating a Multicast Data Packet in an SA message
By default, an SA message contains only (S, G) information, with no multicast data packets
encapsulated. You can configure multicast data encapsulation for an SA message on the source
RP configured with an MSDP peer.
Context
Do as follows on the source RP configured with an MSDP peer:
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
msdp [ vpn-instance vpn-instance-name ]
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 7 MSDP Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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