ipv6 bfd all-interfaces(IS-IS)

Function

The ipv6 bfd all-interfaces command configures the parameters of IPv6 BFD sessions.

The ipv6 bfd all-interfaces command restores the default parameters of IPv6 BFD sessions.

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

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

undo ipv6 bfd all-interfaces { 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

IS-IS 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

The ipv6 bfd all-interfaces command can take effect only after IPv6 is enabled for the IS-IS process by the ipv6 enable command.

Precautions

If only IPv6 BFD session parameters are configured but the ipv6 bfd all-interfaces enable command is not run, no IPv6 BFD sessions can be established.

After the local min-rx-interval is compared with the remote min-tx-interval, the larger value is chosen as the actual local receiving interval.

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.

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.

If IPv6 BFD parameters are configured in both an IS-IS process and an IS-IS interface, IPv6 BFD parameters configured on the interface take effect.

Example

# Configure IPv6 BFD for an IS-IS process, and specify the minimum interval for sending IPv6 BFD packets to 300 ms.

<HUAWEI> system-view
[HUAWEI] ipv6
[HUAWEI] isis
[HUAWEI-isis-1] ipv6 enable
[HUAWEI-isis-1] ipv6 bfd all-interfaces enable
[HUAWEI-isis-1] ipv6 bfd all-interface min-tx-interval 300