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Configuration Guide - IP Multicast

CloudEngine 8800, 7800, 6800, and 5800 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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Configuring IPv4 PIM Silent

Configuring IPv4 PIM Silent

Pre-configuration Tasks

Before configuring PIM Silent, complete the following task:

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

Context

On the access layer, the PIM protocol must be enabled on the interfaces directly connected to user hosts, so that the interfaces can establish PIM neighbor relationships to process various PIM packets. The configuration, however, brings security risks. When a host maliciously sends many PIM Hello messages, the device may break down.

To prevent the preceding case, you can set the state of the device interface to PIM silent. When the interface is in PIM silent state, the interface is disabled from receiving and forwarding any PIM packet. All PIM neighbors and PIM state machines on the interface are deleted. The interface functions as the static DR and immediately takes effect. The PIM silent function does not affect the IGMP function on the interface.

PIM client takes effect on an interface only when the interface is directly connected to a user network segment and when the network segment is connected only to this PIM device.

  • After you configure PIM silent on an interface, the interface no longer receives or sends any PIM packets and other PIM functions on the interface become invalid. Confirm your action before configuring this function.

  • If a user network segment is connected to multiple devices and PIM silent is enabled on interfaces of multiple devices, the interfaces become static DRs. This results in multicast faults.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. On an Ethernet interface, run undo portswitch

    The interface is switched to Layer 3 mode.

    By default, an Ethernet interface works in Layer 2 mode.

    The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.

    NOTE:

    If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

  4. For a Layer 3 sub-interface, run the following commands to configure termination of single-tagged packets on it.
    1. Run quit

      Return to the system view.

    2. Run interface interface-type interface-number.subinterface-number

      The Layer 3 sub-interface view is displayed.

      The subinterface-number parameter must specify a Layer 3 sub-interface number on an Ethernet interface that has been switched to the Layer 3 mode.

    3. Run dot1q termination vid vid

      Termination of Dot1q packets is configured on the Layer 3 sub-interface.

      By default, the termination of Dot1q packets is not configured on a Layer 3 sub-interface.

  5. Run pim silent

    The PIM silent function is enabled.

  6. Run commit

    The configuration is committed.

Verifying the Configuration

After PIM silent is configured, you can check information about the PIM interface.

Run the display pim [ vpn-instance vpn-instance-name | all-instance ] interface [ interface-type interface-number | up | down ] [ verbose ] command to check PIM information on an interface.
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Updated: 2019-04-20

Document ID: EDOC1100075361

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