Configuring Pim-Sm Inter-Domain Multicast; Establishing The Configuration Task - Huawei Quidway s3700 series Configuration Manual

Quidway S3700 Series Ethernet Switches
Configuration Guide - Multicast
Setting the TTL threshold can limit the transmission scope of a multicast data packet contained
in an SA message. After receiving an SA message containing a multicast data packet, an MSDP
peer checks the TTL value in the IP header of the multicast packet. If the TTL value is equal to
or smaller than the threshold, the MSDP peer does not forward the SA message to the 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 the message out.
Rules for Creating, Receiving, and Forwarding SA Messages
By default, MSDP switchs receive all SA messages that pass the RPF check and forward them
to all MSDP peers.
To control the transmission of SA messages between MSDP peers, you can configure filtering
rules by using the following methods:
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MSDP Authentication
Configuring MSDP MD5 or Key-Chain authentication can improve the security of TCP
connections set up between MSDP peers. Note that the MSDP peers must be configured with
the same authentication password; otherwise, the TCP connection cannot be set up between
MSDP peers and MSDP messages cannot be transmitted.

8.3 Configuring PIM-SM Inter-domain Multicast

This section describes how to set up an MSDP peer relationship between PIM-SM domains in
an AS and how to configure MSDP peers.

8.3.1 Establishing the Configuration Task

Before configuring PIM-SM inter-domain multicast, you need to configure intra-domain
multicast.
Applicable Environment
When a large multicast network is divided into multiple PIM-SM domains, MSDP is used to
connect RPs of various domains to share the source information. In this manner, hosts in a domain
can receive multicast data sent by multicast sources in other domains.
To ensure that all RPs in the network can share the source information, reduce the scale of an
MSDP connected graph. It is recommended to configure MSDP peer relationships between all
RPs, including static RPs and C-RPs, in the network.
Issue 01 (2011-10-26)
Setting rules for filtering SA messages based on multicast sources on the source RP
The source RP filters active multicast sources that register with the local switch, and then
determines whether to send (S, G) entries based on the rules.
Setting rules for filtering SA messages received from remote MSDP peers
When an SA message sent by a remote MSDP peer reaches the local switch, the switch
determines whether to receive the message based on the rules.
Setting rules for filtering SA messages forwarded to remote MSDP peers
Before forwarding an SA message to a remote MSDP peer, the local switch determines
whether to forward it based on the rules.
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