Adjusting Control Parameters for a Multicast Source

Pre-configuration Tasks

Before setting the parameters for controlling a multicast source, complete the following tasks:

Configure a unicast routing protocol to ensure normal unicast routing on the network.
Enable PIM-SM.

Context

After a PIM device receives a multicast packet from a multicast source, it starts a timer for the (S, G) entry and sets the timer to the multicast source lifetime. If the device receives a packet from the source before the timer expires, it resets the timer. If not, the device considers the corresponding (S, G) entry invalid and deletes it. The multicast source lifetime is configurable.

To control multicast traffic or ensure data security, configure source address-based filtering policies on PIM devices to ensure that they accept only multicast data allowed by the policies.

Default Settings

Table 1 lists the default settings of multicast source control parameters.

**Table 1** Default settings of multicast source control parameters
Parameter	Default Setting
Keepalive period of a multicast source	210s
Source address filtering policy	No policy configured (Multicast data from all sources is accepted.)

Procedure

Run system-view
The system view is displayed.
Run pim [ vpn-instance vpn-instance-name | all-instance ]
The PIM view is displayed.
Run source-lifetime { interval | infinity } [ group-policy acl-number ]
The multicast source lifetime is configured.
Run source-policy acl-number
A multicast source address-based filtering policy is configured.
- If a basic ACL is specified in the command, the allowed multicast packets are specified by the source parameter in the rule configured under the basic ACL. The device forwards only the multicast packets with the source addresses allowed by the filtering policy.
- If an advanced ACL is specified in the command, the allowed multicast packets are specified by source and destination parameters in the rule configured under the advanced ACL. The device forwards only the multicast packets with both source addresses and group addresses allowed by the filtering policy.
- If the specified ACL contains no rule, the device does not forward multicast packets from any sources.
- This command does not filter multicast packets that match the PIM entries generated from statically configured IGMP (S, G) entries.

Verifying the Configuration

After configuring control parameters of a multicast source, run the following commands to check the PIM routing table information.

display pim [ vpn-instance vpn-instance-name | all-instance ] routing-table [ group-address [ mask { group-mask-length | group-mask } ] | source-address [ mask { source-mask-length | source-mask } ] | incoming-interface { interface-type interface-number | register } | outgoing-interface { include | exclude | match } { interface-type interface-number | register | none } | mode { dm | sm | ssm } | flags flag-value | fsm ] ^* [ outgoing-interface-number [ number ] ]
display pim [ vpn-instance vpn-instance-name | all-instance ] routing-table brief [ group-address [ mask { group-mask-length | group-mask } ] | source-address [ mask { source-mask-length | source-mask } ] | incoming-interface { interface-type interface-number | register } ] ^*