Bidirectional Forwarding Detection (BFD) support for
virtual circuit connection verification (VCCV) allows you to configure
a control channel for a pseudowire, in addition to the corresponding
operations and management functions to be used over that control channel.
BFD provides a low resource mechanism for the continuous monitoring
of the pseudowire data path and for detecting data plane failures.
This feature provides support for asynchronous mode BFD for VCCV
as described in RFC 5885, Bidirectional Forwarding Detection
(BFD) for the Pseudowire Virtual Circuit Connectivity Verification
(VCCV). You can also use a ping to detect pseudowire failures.
However, the processing resources required for a ping are greater
than what is needed for BFD. In addition, BFD is capable of detecting
data plane failure faster than VCCV ping. BFD for pseudowires is supported
for Layer 2 circuits (LDP-based).
To configure BFD for VCCV:
- Specify the threshold for the adaptation of the BFD session
detection time.
[edit protocols l2circuit neighbor IP-address interface interface-name oam bfd-liveness-detection]
user@host# set detection-time threshold milliseconds
For example, to set a detection time threshold of 40 milliseconds
for OAM BFD liveness detection:
[edit protocols l2circuit neighbor 192.0.2.1 interface ge-1/1/9.0 oam bfd-liveness-detection]
user@host# set detection-time threshold 40
- Configure the virtual circuit ID for the Layer 2 circuit
protocol.
[edit protocols l2circuit neighbor IP-address interface interface-name]
user@host# set virtual-circuit-id virtual-circuit-id
For example, to set the virtual circuit ID as 1 for OAM BFD
liveness detection:
[edit protocols l2circuit neighbor 192.0.2.1 interface ge-1/1/9.0 oam bfd-liveness-detection]
user@host# set virtual-circuit-id 1
- Configure the minimum interval after which the local routing
device transmits hello packets and then expects to receive a reply
from a neighbor with which it has established a BFD session for the
Layer 2 circuit.
[edit protocols l2circuit neighbor IP-address interface interface-name oam bfd-liveness-detection]
user@host# set minimum-interval milliseconds
For example, to set a minimum interval of 300 milliseconds for
OAM BFD liveness detection:
[edit protocols l2circuit neighbor 192.0.2.1 interface ge-1/1/9.0 oam bfd-liveness-detection]
user@host# set minimum-interval 300
- Configure the minimum interval after which the local routing
device must receive a reply from a neighbor with which it has established
a BFD session for the Layer 2 circuit protocol.
[edit protocols l2circuit neighbor IP-address interface interface-name oam bfd-liveness-detection]
user@host# set minimum-receive-interval milliseconds
For example, to set a minimum receive interval of 10 milliseconds
for OAM BFD liveness detection:
[edit protocols l2circuit neighbor 192.0.2.1 interface ge-1/1/9.0 oam bfd-liveness-detection]
user@host# set minimum-receive-interval 10
- Configure the number of hello packets not received by
a neighbor that causes the originating interface to be declared down
for the Layer 2 circuit protocol.
[edit protocols l2circuit neighbor IP-address interface interface-name oam bfd-liveness-detection]
user@host# set multiplier number
For example, to set the multiplier as 3 for OAM BFD liveness
detection:
[edit protocols l2circuit neighbor 192.0.2.1 interface ge-1/1/9.0 oam bfd-liveness-detection]
user@host# set multiplier 3
- Configure to disable adaptation.
[edit protocols l2circuit neighbor IP-address interface interface-name oam bfd-liveness-detection]
user@host# set no-adaptation
- Configure the minimum interval at which the local routing
device transmits hello packets to a neighbor with which it has established
a BFD session.
[edit protocols l2circuit neighbor IP-address interface interface-name oam bfd-liveness-detection transmit-interval]
user@host# set minimum-interval milliseconds
For example, to set a minimum transmit interval of 5 milliseconds
for OAM BFD liveness detection:
[edit protocols l2circuit neighbor 192.0.2.1 interface ge-1/1/9.0 oam bfd-liveness-detection transmit-intreval]
user@host# set minimum-interval 5
- Specify the threshold for the adaptation of the BFD session
transmit interval.
[edit protocols l2circuit neighbor IP-address interface interface-name oam bfd-liveness-detection transmit-interval]
user@host# set threshold milliseconds
For example, to set a transmit interval threshold of 30 milliseconds
for OAM BFD liveness detection:
[edit protocols l2circuit neighbor 192.0.2.1 interface ge-1/1/9.0 oam bfd-liveness-detection transmit-intreval]
user@host# set threshold 30
