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Viptela Documentation

BFD

You can use the BFD template for all vEdge Cloud and vEdge router devices.

The BFD protocol, which detects link failures as part of the Viptela high availability solution, is enabled by default on all vEdge routers.

To configure BFD parameters using vManage templates:

  1. Create a BFD feature template to configure BFD parameters, as described in this article.
  2. Create a device template that incorporates the BFD feature template. See the Configuration ► Templates help topic.

Navigate to the Template Screen

  1. In vManage NMS, select the Configuration ► Templates screen.
  2. From the Templates title bar, select Feature.
  3. Click Add Template.
  4. In the left pane, select one or more devices. The right pane displays the available templates for the selected devices.
  5. Select the BFD template.

The right pane displays the BFD template form.

  • The top of the form contains fields for naming the template.
  • The bottom contains fields for defining parameters applicable to that template.
  • A drop-down menu to the left of each parameter field defines the scope of the parameter. When you first open a feature template form, for each parameter that has a default value, the scope is set to Default. To edit a parameter field, change the scope to Global or Device Specific. Note that if a parameter's scope is Device Specific, you cannot enter a value for it in the feature template. Instead, you enter a value when you attach the template to a device.
  • A plus sign (+) is displayed to the right when you can add multiple entries for the same parameter.

Minimum BFD Configuration

BFD is enabled by default, and you cannot disable it.

Configure BFD for Application-Aware Routing

To configure the BFD timers used by application-aware routing:

Parameter Name Description
Template Name Enter the template name. It can be up to 128 characters and can contain only alphanumeric characters.
Description (Template) Enter a description for the template. It can be up to 2048 characters and can contain only alphanumeric characters.
Multiplier Specify the value by which to multiply the poll interval, to set how often application-aware routing acts on the data plane tunnel statistics to figure out the loss and latency and to calculate new tunnels if the loss and latency times do not meet configured SLAs.
Range: 1 through 6
Default: 6
Poll Interval Specify how often BFD polls all data plane tunnels on a vEdge router to collect packet latency, loss, and other statistics used by application-aware routing.
Range: 1 through 4,294,967,296 (232 – 1) milliseconds
Default: 600,000 milliseconds (10 minutes)
Save Click Save to save the feature template.

CLI equivalent:

bfd app-route
  multiplier number 
  poll-interval milliseconds

 

Configure BFD on Transport Tunnels

To configure the BFD timers used on transport tunnels, click the plus sign (+).

Parameter Name Description
Color Enter the color of the transport tunnel for data traffic moving between vEdge routers. The color identifies a specific WAN transport provider.
Values: 3g, biz-internet, blue, bronze, custom1, custom2, custom3, default, gold, green, lte, metro-ethernet, mpls, private1 through private6, public-internet, red, silver
Default: default
Hello Interval Specify how often BFD sends Hello packets on the transport tunnel. BFD uses these packets to detect the liveness of the tunnel connection and to detect faults on the tunnel.
Range: 100 through 60000 milliseconds
Default: 1000 milliseconds (1 second)
Multiplier Specify how many Hello packet intervals BFD waits before declaring that a tunnel has failed. BFD declares that the tunnel has failed when, during all these intervals, BFD has received no Hello packets on the tunnel. This interval is a multiplier of the Hello packet interval time.
Range: 1 through 60
Default: 7 (for hardware vEdge routers), 20 (for vEdge Cloud software routers)
Path MTU Click On to enable path MTU discovery for the transport tunnel, or Off to disable. When PMTU discovery is enabled, the path MTU for the tunnel connection is checked periodically, about once per minute, and it is updated dynamically. When PMTU discovery is disabled, the expected tunnel MTU is 1472 bytes, but the effective tunnel MTU is 1468 bytes.
Default: Enabled

To add another entry, click the plus sign (+).

To remove an entry, click the trash icon to the right of the entry.

CLI equivalent:

bfd color color
  ​hello-interval milliseconds    
  multiplier number 
  pmtu-discovery

Release Information

Introduced in vManage NMS in Release 15.2.

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