The isis ipv6 bfd command configures IPv6 BFD parameters on an interface.
The undo isis ipv6 bfd command restores default IPv6 BFD parameters on an interface.
By default, the minimum interval at which IPv6 BFD packets are sent or received is 10, in milliseconds; the IPv6 BFD local detection multiplier is 3.
isis ipv6 bfd { min-tx-interval transmit-interval | min-rx-interval receive-interval | detect-multiplier multiplier-value | frr-binding } *
undo isis ipv6 bfd { min-tx-interval [ transmit-interval ] | min-rx-interval [ receive-interval ] | detect-multiplier [ multiplier-value ] | frr-binding } *
| Parameter | Description | Value |
|---|---|---|
| min-tx-interval transmit-interval |
Specifies the minimum interval at which IPv6 BFD packets are sent to the peer end. |
The value is an integer ranging from 3 to 20000, in milliseconds. The default value is 10. |
| min-rx-interval receive-interval |
Specifies the minimum interval at which IPv6 BFD packets are received from the peer end. |
The value is an integer ranging from 3 to 20000, in milliseconds. The default value is 10. |
| detect-multiplier multiplier-value |
Specifies the IPv6 BFD local detection multiplier. |
The value ranges from 3 to 50. The default value is 3. |
| frr-binding |
Binds the status of the IPv6 BFD session to IPv6 IS-IS Auto FRR. If IPv6 BFD detects a link fault on the interface, the IPv6 BFD session goes Down, triggering FRR on the interface. Then, traffic is switched from the faulty link to the backup link. |
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Usage Scenario
BFD can provide millisecond-level fault detection, help IS-IS to detect the faults that occur on neighboring devices or links more quickly, and instruct IS-IS to recalculate routes for correct packet forwarding. The isis ipv6 bfd command can be used to set values for BFD session parameters on a specified interface.
Prerequisites
BFD has been enabled globally, and run the isis ipv6 bfd enable command has been run on a specified interface.
Configuration Impact
The minimum interval at which IPv6 BFD packets are received is obtained after the receive-interval value and the remote transmit-interval value are compared. If the local end does not receive any BFD packet from its neighbor within the period (minimum interval at which IPv6 BFD packets are received x multiplier-value), the local end declares the neighbor Down.
Precautions
The priority of BFD configured on an interface is higher than that of BFD configured in a process. If BFD is enabled on an interface, BFD sessions are established with the BFD parameters set on the interface.
The set IPv6 BFD session parameters take effect only when IPv6 BFD is enabled on the interface.<HUAWEI> system-view [~HUAWEI] isis 1 [*HUAWEI-isis-1] ipv6 enable [*HUAWEI-isis-1] quit [*HUAWEI] interface GigabitEthernet0/1/0 [*HUAWEI-GigabitEthernet0/1/0] ipv6 enable [*HUAWEI-GigabitEthernet0/1/0] isis ipv6 enable 1 [*HUAWEI-GigabitEthernet0/1/0] isis ipv6 bfd enable [*HUAWEI-GigabitEthernet0/1/0] isis ipv6 bfd min-rx-interval 400 detect-multiplier 4