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NE20E-S2 V800R010C10SPC500 Feature Description - Network Reliability 01

This is NE20E-S2 V800R010C10SPC500 Feature Description - Network Reliability
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BFD for Link-Bundle

BFD for Link-Bundle

Two routing devices are connected through an Eth-Trunk that has multiple member interfaces. If the Eth-Trunk fails and common BFD is used, only one single-hop BFD session is created. After the creation is complete, BFD selects the board on which a member interface resides as a state machine board and monitors the member interface. If the member interface or state machine board fails, BFD considers the entire Eth-Trunk failed even if other member interfaces of the Eth-Trunk are Up. BFD for link-bundle resolves this issue.

Figure 2-8 BFD for link-bundle networking
On the network shown in Figure 2-8, a BFD for link-bundle session consists of one main session and multiple sub-sessions.
  • Each sub-session independently monitors an Eth-Trunk member interface and reports the monitoring results to the main session. Each sub-session uses the same monitoring parameters as the main session.
  • The main session creates a BFD sub-session for each Eth-Trunk member interface, summarizes the sub-session monitoring results, and determines the status of the Eth-Trunk.
    • The main session is Up so long as a sub-session is Up.
    • If no sub-session is available, the main session goes Down and the Unknown state is reported to applications. The status of the Eth-Trunk port is not changed.
    • If the Eth-Trunk has only one member interface and the corresponding sub-session is Up, the main session goes Down when the member interface exits the Eth-Trunk. The status of the Eth-Trunk is Up.

The main session's local discriminator is allocated from the range from 0x00100000 to 0x00103fff without occupying the original BFD session discriminator range. The main session does not learn the remote discriminator because it does not send or receive packets. A sub-session's local discriminator is allocated from the original dynamic BFD session discriminator range using the same algorithm as a dynamic BFD session.

Only sub-sessions consume BFD session resources per board. A sub-session must select the board on which the physical member interface bound to this sub-session resides as a state machine board. If no BFD session resources are available on the board, board selection fails. In this situation, the sub-session's status is not used to determine the main session's status.

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Updated: 2019-01-02

Document ID: EDOC1100055473

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