Configuring A Multicast Data Filter - HP A8800 Configuration Manual

Configuring a multicast data filter

No matter in a PIM-DM domain or a PIM-SM domain, routers can check passing-by multicast data based
on the configured filtering rules and determine whether to continue forwarding the multicast data. In
other words, PIM routers can act as multicast data filters. These filters can help implement traffic control
on one hand, and control the information available to receivers downstream to enhance data security on
the other hand.
Generally, a smaller distance from the filter to the multicast source results in a more remarkable filtering
effect. This filter works not only on independent multicast data but also on multicast data encapsulated in
register messages.
To configure a multicast data filter:
Step
1. Enter system view.
2. Enter public network PIM view
or VPN instance PIM view.
3. Configure a multicast group
filter.
Configuring a hello message filter
Along with the wide applications of PIM, the security requirement for the protocol is becoming more and
more demanding. The establishment of correct PIM neighboring relationships is the prerequisite for
secure application of PIM. You can configure a legal source address range for hello messages on
interfaces of routers to ensure the correct PIM neighboring relationships, and thus to guard against PIM
message attacks.
To configure a hello message filter:
Step
1. Enter system view.
2. Enter interface view.
3. Configure a hello message
filter.
NOTE:
With the hello message filter configured, if hello messages of an existing PIM neighbor fail to pass the
filter, the PIM neighbor will be removed automatically when it times out.
Configuring PIM hello options
No matter in a PIM-DM domain or a PIM-SM domain, the hello messages sent among routers contain
many configurable options:
Command
system-view
pim [ vpn-instance
vpn-instance-name ]
source-policy acl-number
Command
system-view
interface interface-type
interface-number
pim neighbor-policy acl-number
154
Remarks
N/A
N/A
No multicast data filter by default.
Remarks
N/A
N/A
No hello message filter by default.