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Home Documentation Junos OS Junos CLI Reference CLI Reference D

Junos CLI Reference

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Junos CLI Reference
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{ "lLangCode": "en", "lName": "English", "lCountryCode": "us", "transcode": "en_US" }
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detection-time (BFD Liveness Detection)

date_range 10-Sep-24
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Syntax

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detection-time {
    threshold milliseconds;
}

BGP

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[edit logical-systems name protocols              bgp              bfd-liveness-detection],
[edit logical-systems name protocols              bgpgroup              bfd-liveness-detection],
[edit logical-systems name protocols              bgp group name     neighbor address bfd-liveness-detection],
[edit logical-systems name              routing-instances              name  protocols              bgp              bfd-liveness-detection],
[edit logical-systems name              routing-instances              name  protocols              bgpgroup              bfd-liveness-detection],
[edit logical-systems name              routing-instances              name  protocols              bgpgroup neighbor address bfd-liveness-detection],
[edit logical-systems name tenants name routing-instances name protocols              bgp              bfd-liveness-detection],
[edit logical-systems name tenants name routing-instances name protocols              bgpgroup              bfd-liveness-detection],
[edit logical-systems name tenants name routing-instances name protocols              bgpgroup neighbor address bfd-liveness-detection],
[edit protocols bgp    bfd-liveness-detection],
[edit protocols bgp group   bfd-liveness-detection],
[edit protocols bgp group neighbor address bfd-liveness-detection],
[edit routing-instances name protocols              bgp              bfd-liveness-detection],
[edit routing-instances name protocols              bgp group             bfd-liveness-detection],
[edit routing-instances name protocols              bgp group neighbor address bfd-liveness-detection],
[edit tenants name routing-instances name protocols bgp              bfd-liveness-detection]
[edit tenants name routing-instances name protocols bgp group             bfd-liveness-detection]
[edit tenants name routing-instances name protocols bgp groupneighbor address bfd-liveness-detection]

EVPN, L2VPN, VPLS

content_copy zoom_out_map
[edit logical-systems name              routing-instances              name protocols (evpn | l2vpn | vpls)  oam              bfd-liveness-detection],
[edit logical-systems name              routing-instances              name protocols (evpn | l2vpn | vpls) neighbor neighbor-id oam bfd-liveness-detection],
[edit logical-systems name              routing-instances              name protocols (evpn | l2vpn | vpls)mesh-group mesh-group-name neighbor    neighbor-id oam bfd-liveness-detection],
[edit logical-systems name tenants name routing-instances name protocols (evpn | l2vpn | vpls)              oam              bfd-liveness-detection],
[edit logical-systems name tenants name routing-instances name protocols (evpn | l2vpn | vpls)neighbor neighbor-id oam bfd-liveness-detection],
[edit logical-systems name tenants name routing-instances name protocols (evpn | l2vpn | vpls)mesh-group mesh-group-name neighbor    neighbor-id oam bfd-liveness-detection],
[edit routing-instances name protocols (evpn | l2vpn | vpls)              oam              bfd-liveness-detection],
[edit routing-instances name protocols (evpn | l2vpn | vpls) neighbor neighbor-id oam bfd-liveness-detection],
[edit routing-instances name protocols (evpn | l2vpn | vpls)mesh-group mesh-group-name neighbor    neighbor-id oam bfd-liveness-detection],
[edit tenants name routing-instances name protocols (evpn | l2vpn | vpls)             oam              bfd-liveness-detection],
[edit tenants name routing-instances name protocols (evpn | l2vpn | vpls) neighbor neighbor-id oam              bfd-liveness-detection],
[edit tenants name routing-instances name protocols (evpn | l2vpn | vpls)mesh-group mesh-group-name neighbor    neighbor-id oam bfd-liveness-detection],

Description

Enable BFD failure detection. The BFD failure detection timers are adaptive and can be adjusted to be faster or slower. The lower the BFD failure detection timer value, the faster the failure detection and vice versa. For example, the timers can adapt to a higher value if the adjacency fails (that is, the timer detects failures more slowly). Or a neighbor can negotiate a higher value for a timer than the configured value. The timers adapt to a higher value when a BFD session flap occurs more than three times in a span of 15 seconds. A back-off algorithm increases the receive (Rx) interval by two if the local BFD instance is the reason for the session flap. The transmission (Tx) interval is increased by two if the remote BFD instance is the reason for the session flap. You can use the clear bfd adaptation command to return BFD interval timers to their configured values. The clear bfd adaptation command is hitless, meaning that the command does not affect traffic flow on the routing device.

Starting in Junos OS Release 20.3R1, we support distributed mode for BFD failure detection on the SRX5000 line of devices with SPC3 card. The distributed mode provides faster BFD failure detection of 300 (3 x 100) ms. You can enable distributed mode when you configure the BFD failure detection timer value less than 500 ms.

Starting in Junos OS Release 21.1R1, we support distributed mode for BFD on SRX1500, SRX4100, SRX4200, and SRX4600. This mode provides a faster BFD failure detection time of 3 x 300 ms.

For optimization and performance enhancement, you must configure the BFD failure detection timer value in multiples of 50 ms.

Starting in Junos OS Release 24.3R1, we’ve introduced distributed mode for BFD failure detection on vSRX 3.0. To enable distributed mode, configure the BFD failure detection time value as 500 ms. This feature is supported in stand-alone and L3-HA mode on vSRX 3.0.

With this support, we've also added the dedicated offload CPU feature on vSRX 3.0. The dedicated offload CPU feature reschedules a flow thread and uses the DPDK flow filters on the NIC to move high priority packets (BGP, RIPv2, OSPF, PIM, Multicast, IGMP, Single-Hop BFD, and Multihop BFD) onto the dedicated flow thread. With this feature, packets are processed by their own dedicated flow thread or queue, even in cases where the forwarding plane is oversubscribed and dropping packets.

To enable the dedicated offload CPU feature on vSRX 3.0, run the set security forwarding-options dedicated-offload-cpu command.

To view the Packet Forwarding Engine’s current dedicated offload CPU status use the show security forward-options dedicated-offload-cpu command. This command displays whether the Packet Forwarding Engine has dedicated offload CPU feature enabled or disabled.

Options

threshold milliseconds

Specify the threshold for the adaptation of the BFD session detection time. When the detection time adapts to a value equal to or greater than the threshold, a single trap and a single system log message are sent.

Note:

The threshold value must be equal to or greater than the transmit interval.

The threshold time must be equal to or greater than the value specified in the minimum-interval or the minimum-receive-interval statement.

  • Range: 1 through 255,000 ms

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration

Release Information

Statement introduced in Junos OS Release 8.2.

Support for BFD authentication introduced in Junos OS Release 9.6.

Related Documentation

arrow_backward PREVIOUS detection-time (BFD for PIM)
NEXT arrow_forward detection-time (LAG)
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