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NE40E V800R010C10SPC500 Feature Description - Network Reliability 01

This is NE40E V800R010C10SPC500 Feature Description - Network Reliability

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BFD Session Group

BFD Session Group

Background

Devices are connected through Eth-Trunk interfaces, and the two member interfaces of the Eth-Trunk interface are located on different interface boards. When the interface board where the BFD session resides is different from the interface board selected for the current service traffic, if the member interface of the BFD session, the member link, or the board of the state machine is faulty, the BFD module considers that the Eth-Trunk interface faulty. A BFD detection error occurs.

This problem can be solved by creating a BFD session group.

Application Scenario

  • Create a BFD session group to monitor a TE LSP/tunnel link.

    When a BFD session group is configured to detect the TE LSP/tunnel link, as shown in Figure 2-30, R1 and R2 are connected through the Eth-Trunk interface across the interface boards. The TE LSP/tunnel link between R1 and R2 is the primary service path, and the path from R1 to R2 through R3 is the backup service path. A BFD session group is configured between R1 and R2 to detect the service links. Two BFD sub-sessions are configured in the BFD session group. The state machines of BFD sub-sessions are located on interface boards 1 and 2 respectively and used to detect the two paths between the interface boards.

    Figure 2-30 Networking for the BFD session group to monitor the same TE LSP/tunnel link

    If interface board 2 fails, BFD sub-session 2 goes Down. However, BFD sub-session 1 is constantly Up. Therefore, the BFD session group is still Up. Service components are aware of only the status of the BFD session group. Therefore, services are not Down. The status of a BFD session group becomes Down only when BFD sub-session 1 and BFD sub-session 2 are both Down.

  • Create a BFD session group to monitor an IP multi-hop link.

    When a BFD session group is configured to detect an IP multi-hop link, R2 and R3 are connected through the Eth-Trunk interface across the interface boards. The IP multi-hop service path is used between R1 and R3, and the BFD session tracks the status of the inter-board Eth-Trunk interface. In this scenario, you are advised to configure a BFD session group. As shown in Figure 2-31, a BFD session group is configured between R2 and R3 to detect service links. Two BFD sub-sessions are configured in the BFD session group. The BFD state machines are located on interface boards 1 and 2 and are used to monitor the service links between two interface board 1 and two interface board 2.

    Figure 2-31 Networking for the BFD session group to monitor the same IP link

    Interface board 2 is faulty, the status of sub-session 2 in the BFD session group is Down, but the BFD sub-session on interface board 1 is Up. According to the BFD session group detection mechanism, the status of the BFD session group is still Up. Service components are aware of only the status of the BFD session group. Therefore, services links are not Down. The status of a BFD session group becomes Down only when BFD sub-session 1 and BFD sub-session 2 are both Down. In this case, service links are also Down.

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Updated: 2019-01-03

Document ID: EDOC1100055045

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