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Command Reference

CloudEngine 8800, 7800, 6800, and 5800 V200R002C50

This document describes all the configuration commands of the device, including the command function, syntax, parameters, views, default level, usage guidelines, examples, and related commands.
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ospfv3 bfd

ospfv3 bfd

Function

The ospfv3 bfd enable [ instance instance-id ] command enables the BFD on the specified interface enabled with OSPFv3. After a BFD session is set up, use the default parameter values.

The ospfv3 bfd { block | { min-transmit-interval min-transmit-value | min-receive-interval min-receive-value | detect-multiplier multiplier-value | frr-binding} * [ instance instance-id ] } command sets the parameter values of a BFD session.

The undo ospfv3 bfd enable [ instance instance-id ] command deletes the BFD on the specified interface.

The undo ospfv3 bfd { block | { min-transmit-interval [ min-transmit-value ] | min-receive-interval [ min-receive-value ] | detect-multiplier [ multiplier-value ] | frr-binding } * [ instance instance-id ] } command restores the default parameter values of a BFD session.

By default, BFD is not enabled or configured at OSPFv3 interface view.

Format

ospfv3 bfd enable [ instance instance-id ]

ospfv3 bfd { block | { min-transmit-interval min-transmit-value | min-receive-interval min-receive-value | detect-multiplier multiplier-value | frr-binding } * [ instance instance-id ] }

undo ospfv3 bfd enable [ instance instance-id ]

undo ospfv3 bfd { block | { min-transmit-interval [ min-transmit-value ] | min-receive-interval [ min-receive-value ] | detect-multiplier [ multiplier-value ] | frr-binding } * [ instance instance-id ] }

Parameters

Parameter Description Value
enable Enables BFD. -
block Indicates block BFD for OSPFv3 in the specified interface. -
min-transmit-interval min-transmit-interval Specifies the minimum interval at which BFD packets are sent to the peer end.

The value is an integer. The value ranges from 3 to 1000 on the CE6880EI and 50 to 1000 on other models. The value is expressed in milliseconds. The default value is 1000 ms.

min-receive-interval min-receive-interval Specifies the minimum interval at which BFD packets are received from the peer end.

The value is an integer. The value ranges from 3 to 1000 on the CE6880EI and 50 to 1000 on other models. The value is expressed in milliseconds. The default value is 1000 ms.

detect-multiplier multiplier-value Specifies the local detection multiplier. The value is an integer ranging from 3 to 50. By default, it is 3.
frr-binding Binds the BFD session status and the link status of an interface. -
instance instance-id Indicates the interface instance id. The value is an integer ranges from 0 to 255.

Views

Interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

A link fault or a topology change causes devices to recalculate routes. Therefore, the convergence of routing protocols must be as quick as possible to improve network performance.

Link faults are inevitable. Therefore, fast detecting faults and notifying routing protocols of the faults is a feasible solution to immediately rectify link faults. After BFD is associated with routing protocols, BFD can speed up the convergence of routing protocols if a link fault occurs.

During the configuration of OSPFv3 IP FRR, the lower layer can fast respond to the link change so that traffic can be rapidly switched to the backup link when the primary link becomes faulty. By setting the parameter frr-binding, you can associate the BFD session status with the link status of an interface (when the BFD session goes Down, the link status of the interface becomes Down) so that link faults can be rapidly detected.

Prerequisites

The set BFD session parameters take effect only when BFD is enabled on the interface.

Procedure

The value of receive-interval is obtained through the negotiation of the local min-receive-interval value and the remote min-transmit-interval value. If a device does not receive any BFD packet from its peer within the period obtained by receive-interval multiplied by multiplier-value (local detection time), the device advertises that its peer is Down.

Effect

If global BFD is not enabled, BFD can be enabled on an interface. The BFD session, however, cannot be set up after BFD is enabled on the interface. If the parameters of a BFD session are set but the ospfv3 bfd enable command is not run, the BFD session cannot be set up.

The BFD configuration on an interface takes precedence over that in a process. If BFD is enabled on an interface, a BFD session is established according to the BFD parameters set on the interface.

Follow-up Procedure

The display ospfv3 bfd session command is used to display the information about neighbors enabled with BFD.

Precautions

After being enabled with OSPFv3, a device can set up BFD sessions with only neighbors with which the device sets up adjacencies.

The ospfv3 bfd enable command and the ospfv3 bfd block command are mutually exclusive. Therefore, the two commands cannot be used at the same time.

NOTE:

After BFD is disabled on an interface with the undo ospfv3 bfd enable command, the interface still has the BFD session parameters.

Example

# Enable BFD on VLANIF100 and specify the minimum receiving interval to 80 ms and local detection multiple to 4.

<HUAWEI> system-view
[~HUAWEI] interface vlanif100
[*HUAWEI-Vlanif100] ospfv3 bfd enable
[*HUAWEI-Vlanif100] ospfv3 bfd min-receive-interval 80 detect-multiplier 4

# Enable BFD on 10GE1/0/1 and specify the minimum receiving interval to 80 ms and local detection multiple to 4.

<HUAWEI> system-view
[~HUAWEI] interface 10ge 1/0/1
[~HUAWEI-10GE1/0/1] undo portswitch
[*HUAWEI-10GE1/0/1] ospfv3 bfd enable
[*HUAWEI-10GE1/0/1] ospfv3 bfd min-receive-interval 80 detect-multiplier 4
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Updated: 2019-03-21

Document ID: EDOC1000166501

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