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Configuration Guide - IP Multicast

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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Adjusting Control Parameters for a Multicast Source in IPv4 PIM-SM

Adjusting Control Parameters for a Multicast Source in IPv4 PIM-SM

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.
  • Enabling 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 the device does not receive any multicast packet from the source within the lifetime, it considers the corresponding (S, G) entry invalid and deletes this entry. You can configure the multicast source lifetime.

To control multicast traffic or ensure data security, configure source address-based filtering policies on the device so that the device accepts only multicast data allowed by the policies.

Default Settings

Table 4-17 lists default settings of multicast source control parameters.

Table 4-17 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

  1. Run system-view

    The system view is displayed.

  2. Run pim [ vpn-instance vpn-instance-name ]

    The PIM view is displayed.

  3. Run source-lifetime interval

    The multicast source lifetime is configured.

    Configure timeout period of (S, G) or (*, G) entries according to the number of the multicast forwarding entries used. If a large number of multicast entries are used on your network, a too short timeout period will make the multicast forwarding table incomplete. However, if the timeout period is too long, invalid entries will be retained for a long time, wasting system resources. The following table lists the recommended timeout periods for different quantities of multicast forwarding entries. In this table, the number of entries refers the total number of multicast entries in public network instances and VPN instances of all VSs in the system. It is recommended that you set the same timeout period in all public network instances and VPN instances based on the total number of multicast entries in the system.

    Number of Entries

    Recommended Timeout Period

    Within 1000

    Default value

    1000 to 2000

    1000 seconds

    2000 to 8000

    2000 seconds

    More than 8000

    4000 seconds

  4. Run source-policy { acl-number | acl-name acl-name }

    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.

  5. Run commit

    The configuration is committed.

Verifying the Configuration

After the control parameters of a multicast source are adjusted, you can check entries in the PIM routing table.

Run the following commands to check the PIM routing table.
  • display pim routing-table [ group-address [ mask { group-mask-length | group-mask } ] | source-address [ mask { source-mask-length | source-mask } ] | extranet { source-vpn-instance { all | public | vpn-instance-name } | receive-vpn-instance { all | vpn-instance-name } } | incoming-interface { interface-type interface-number | register | mcast-extranet } | outgoing-interface { include | exclude | match } { interface-type interface-number | vpn-instance vpn-instance-name | register | none } | mode { sm | ssm } | flags flag-value | fsm ] * [ outgoing-interface-number [ number ] ]

  • 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 } ] | extranet { source-vpn-instance { all | public | vpn-instance-name } | receive-vpn-instance { all | vpn-instance-name } } | incoming-interface { interface-type interface-number | register | mcast-extranet } | outgoing-interface { include | exclude | match } { interface-type interface-number | register | none } | mode { ssm | sm } | 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 | mcast-extranet } ] *

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Updated: 2019-04-20

Document ID: EDOC1100074724

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