isis ipv6 bfd

Function

The isis ipv6 bfd command configures IPv6 BFD detection parameters on a specified interface.

The undo isis ipv6 bfd command restores the default values of IPv6 BFD detection parameters on a specified interface.

By default, the minimum interval for sending or receiving IPv6 BFD packets is 1000 milliseconds, and the local IPv6 BFD detection multiplier is 3.

Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this command.

Format

isis ipv6 bfd { min-rx-interval receive-interval | min-tx-interval transmit-interval | detect-multiplier multiplier-value } ^*

undo isis ipv6 bfd { min-rx-interval [ receive-interval ] | min-tx-interval [ transmit-interval ] | detect-multiplier [ multiplier-value ] } ^*

Parameters

Parameter	Description	Value
min-rx-interval receive-interval	Specifies the minimum interval for receiving BFD packets from the peer.	The value is an integer that ranges from 100 to 1000, in milliseconds. After the set service-mode enhanced command is configured on the S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, and S6720-HI, the value ranges from 3 to 1000. After the set service-mode enhanced-bfd command is configured on the S5732-H, S6730-H, S6730S-H, S6730-S, and S6730S-S, the value ranges from 3 to 1000.
min-tx-interval transmit-interval	Specifies the minimum interval for sending BFD packets to the peer.	The value is an integer that ranges from 100 to 1000, in milliseconds. After the set service-mode enhanced command is configured on the S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, and S6720-HI, the value ranges from 3 to 1000. After the set service-mode enhanced-bfd command is configured on the S5732-H, S6730-H, S6730S-H, S6730-S, and S6730S-S, the value ranges from 3 to 1000.
detect-multiplier multiplier-value	Indicates the local detection multiplier.	The value is an integer that ranges from 3 to 50. The default value is 3.

Views

Interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

IPv6 BFD for IS-IS can provide millisecond level fault detection, help IS-IS to detect faults on neighboring devices or links rapidly, and instruct IS-IS to recalculate routes for correct packet forwarding. The isis ipv6 bfd command can be used to configure IPv6 BFD detection parameters on a specified interface.

Prerequisites

Before running the isis ipv6 bfd command, you need to run the ipv6 enable command in the IS-IS process and configure IS-IS on the interface.

The configured IPv6 BFD detection parameters take effect on an interface only when the isis ipv6 bfd enable command is configured on the interface.

Precautions

After the local receive-interval is compared with the remote transmit-interval, the larger value is chosen as the actual local receiving interval. If no IPv6 BFD packets are received from the peer within the actual local detection time, the IPv6 BFD session status is set to Down. The actual local detection time is calculated with the following formula: Actual local detection time = Actual local receiving interval x Local detection multiplier.

To ensure that the actual local receiving interval is the same as the local configured value, you are recommended to configure the same value for the local min-rx-interval and the remote min-tx-interval.

Similarly, to ensure that the actual local IPv6 BFD detection multiplier is the same as the local configured value, you are recommended to configure the same value for the local multiplier-value and the remote multiplier-value.

The isis ipv6 bfd command takes priority over the ipv6 bfd all-interfaces command.

Example

# Enable IPv6 BFD for IS-IS on Vlanif10, and specify the minimum interval for receiving IPv6 BFD packets to 400 ms and the local detection multiplier to 4.

<HUAWEI> system-view
[HUAWEI] interface vlanif 10
[HUAWEI-Vlanif10] isis ipv6 bfd enable
[HUAWEI-Vlanif10] isis ipv6 bfd min-rx-interval 400 detect-multiplier 4