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NE40E V800R010C00 Configuration Guide - Virtual Access 01

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Configuring BD-based Fast Switching for Layer 2 Multicast Traffic

Configuring BD-based Fast Switching for Layer 2 Multicast Traffic

After BD-based fast switching is enabled for Layer 2 multicast traffic in a virtual access system, if the primary link fails, Layer 2 multicast traffic can be rapidly switched to the secondary link.

Usage Scenario

In a scenario where multiple vaLSPs or TE tunnel hot-standby protection is deployed between a master and an AP in a virtual access system, the master's EVC virtual access sub-interface is added to a BD and BD-based fast switching is enabled for Layer 2 multicast traffic. If the primary link fails when the master forwards Layer 2 multicast traffic to the AP, this master fast switches the Layer 2 multicast traffic to the secondary link. The following describes two situations.

  • Two vaLSPs are established between a master and an AP.

    As shown in Figure 3-20, vaLSP1 and vaLSP2 are established between a master and an AP, with vaLSP1 being the primary LSP and vaLSP2 being the backup LSP. An EVC virtual access sub-interface is created on the master and added to a BD, and BD-based fast switching is enabled for Layer 2 multicast traffic on the master. If vaLSP1 is working properly, the master forwards BD-based Layer 2 multicast traffic to the AP over vaLSP1.

    Figure 3-20  Usage scenario where two vaLSPs are established between a master and an AP with the primary vaLSP working properly

    As shown in Figure 3-21, if vaLSP1 fails, the master fast switches the Layer 2 multicast traffic to vaLSP2.

    Figure 3-21  Usage scenario where two vaLSPs are established between a master and an AP with the primary LSP going Down

  • A hot-standby MPLS TE tunnel is established between a master and an AP.

    In Figure 3-22, a primary MPLS TE tunnel is established between the primary master and an AP, and a hot-standby MPLS TE tunnel is established between the secondary master and the AP. An EVC virtual access sub-interface is created on the primary and secondary masters and added to a BD, and BD-based fast switching is enabled for Layer 2 multicast traffic on the primary master. If the primary TE tunnel is working properly, the primary master forwards BD-based Layer 2 multicast traffic to the AP over the primary TE tunnel.

    Figure 3-22  Usage scenario where MPLS TE hot-standby protection is established between a master and an AP with the primary TE tunnel working properly

    If the primary TE tunnel fails as shown in Figure 3-23, the primary master fast switches the Layer 2 multicast traffic to the hot-standby TE tunnel.

    Figure 3-23  Usage scenario where MPLS TE hot-standby protection is established between a master and an AP with the primary TE tunnel going Down

Pre-configuration Tasks

Before configuring BD-based fast switching for Layer 2 multicast traffic, complete the following tasks:

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    interface interface-type interface-number.subnum mode l2

    An EVC virtual access sub-interface is created, and the sub-interface view is displayed.

    A virtual access interface is a virtual agent interface of an AP's external communication interface on a master. For example, GigabitEthernet 1025/1/0/1 indicates that the virtual access interface corresponds to AP 1025's external communication interface GigabitEthernet 1/0/1. GigabitEthernet1025/1/0/1.1 is one of the virtual access interface's sub-interfaces.

  3. Run:

    bridge-domain bd-id

    The EVC virtual access sub-interface is added to a BD.

    bd-id must be the same as that specified in Establishing the EVC Model.

  4. Run:

    quit

    Return to the system view.

  5. Run:

    bridge-domain bd-id

    The BD view is displayed.

    bd-id must be the same as that specified in Establishing the EVC Model.

  6. Run:

    multicast fast-switch enable

    BD-based fast switching is enabled for Layer 2 multicast traffic in the virtual access system.

  7. Run:

    commit

    The configuration is committed.

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Updated: 2018-07-12

Document ID: EDOC1100028541

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