Configuring A Rule For Filtering Received And Forwarded Sa Messages - H3C S5600 Series Operation Manual

Operation Manual – Multicast
H3C S5600 Series Ethernet Switches

5.4.6 Configuring a Rule for Filtering Received and Forwarded SA Messages

Besides the creation of source information, controlling multicast source information
allows you to control the forwarding and reception of source information. You can
control the reception of SA messages using the MSDP inbound filter (corresponding to
the import keyword); you can control the forwarding of SA messages by using either
the MSDP outbound filter (corresponding to the export argument) or the TTL threshold.
MSDP inbound/outbound filter implements the following functions:
Filtering out all (S, G) entries
Receiving/forwarding only the SA messages permitted by advanced ACL rules
(You can configure ACL rules for filtering source IP addresses and group IP
addresses.)
An SA message carrying encapsulated data can reach the specified MSDP peer
outside the domain only if the TTL in its IP header is greater than the threshold;
therefore, you can control the forwarding range of SA messages that carry
encapsulated data by configuring the TTL threshold.
Follow these steps to configure a rule for filtering received and forwarded SA
messages:
Enter system view
Enter MSDP view
Configure to filter
imported and exported
SA messages
Configure the minimum
TTL required for a
multicast packet to be
sent to the specified
MSDP peer
To do... Use the command...
system-view
msdp
peer peer-address
sa-policy { import |
export } [ acl
acl-number ]
peer peer-address
minimum-ttl ttl-value
—
—
Optional
By default, no filtering is
imposed on SA messages to
be received or forwarded,
namely all SA messages from
MSDP peers are received or
forwarded.
Optional
By default, the value of TTL
threshold is 0.
5-16
Chapter 5 MSDP Configuration
Remarks