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Diverse Path Design

 

Use the diverse path design feature to automatically configure a tunnel to have its secondary or standby paths diverse from its primary path. You can also design two different tunnels to have diverse primary paths.

From the Juniper NorthStar Planner window, select Application > Path Design. The Diverse Path Design window is displayed as shown in Figure 1. To filter the display, select All, DivGroup, or Secondary/Standby from the toolbar drop-down menu.

Figure 1: Diverse Path Design Window
Diverse Path Design Window

To start a diversity design, select the tunnels to design and select Design > All Paths or Design > Selected Paths. The Designing Tunnels window is displayed as shown in Figure 2.

Figure 2: Designing Tunnels Window Basic Options Tab
 Designing Tunnels Window
Basic Options Tab

Table 1 describes the basic options available in the Designing Tunnels window.

Table 1: Designing Tunnels Window Basic Options

Option

Description

Primary Path

Set the primary path to be explicit (Explicit) or dynamic (Dynamic).

Backup Path #1

Set the first backup path to be explicit or dynamic. Set the first backup path type to be standby or secondary. Enable the system to add new backup paths (Add if missing) or only modify existing backup paths (Change only existing backup).

Backup Path #2

Set the second backup path to be explicit or dynamic. Set the second backup path type to be standby or secondary. Enable the system to add new backup paths (Add if missing) or only modify existing backup paths (Change only existing backup).

Preserve standby/secondary settings of existing tunnels

Select this option to prevent existing backup paths from changing from secondary to standby or standby to secondary.

Default Diversity Level

Set the default level of path diversity as Site (default), Link, or SRLG/Facility.

Evaluate/Design Options

Select Evaluate to evaluate the diversity level without making any path design modifications. Select Incremental to design the diversity level without recalculating existing paths that have explicit routes. Select Redesign to design the diversity level and recalculate paths that have explicit routes.

To set advanced diversity design options, select the Advanced Options tab. The Designing Tunnels window Advanced Options tab is displayed as shown in Figure 3.

Figure 3: Design Tunnels Window Advanced Options Tab
Design Tunnels Window Advanced
Options Tab

Table 2 lists the advanced options available in the Designing Tunnels window.

Table 2: Designing Tunnels Window Advanced Options

Option

Description

Backup Path Bandwidth

Set the backup path bandwidth as a percentage of the primary path bandwidth plus a fixed bandwidth specified as bits.

Preserve existing backup BW

Select to preserve the backup bandwidth for existing paths, and only design bandwidth for backup paths that are added.

Link Reservation Parameters

Set the amount of bandwidth that must not be used for primary and standby paths. Set the reserved bandwidth as a percentage of the link bandwidth plus a fixed amount of bandwidth specified as bits or kilobits.

Path Placement Options

MPLS-Enabled Mode

Select All Links Enabled to consider all links to be MPLS enabled. Select User-Specified Per Link to use the MPLS settings defined on each link to determine if the link is MPLS enabled.

Path Placement Options

Allow path intersections at NoFail nodes/links to be considered diverse

Select this option to allow a path that intersects at a NoFail node or link to be considered diverse.

To change a diversity design, select Modify > All Paths or Modify > Selected Paths. The Modify Tunnels window is displayed as shown in Figure 4.

Figure 4: Modify Tunnels Window
Modify Tunnels Window

Table 3 lists the options available in the Modify Tunnels window.

Table 3: Modify Tunnels Window Options

Option

Description

Configured Diversity Level

Indicate the configured level of path diversity. Available options include facility, link, or site.

Replace Explicit with Dynamic

Convert the primary path from being explicit to dynamic (loose).

Div Group

Use to establish path diversity between different tunnels, which might or might not have the same source and destination routers. To group all tunnels that originate and terminate at the same sites, select SITEPAIR. To remove the selection, select NONE.

Max # Backup Paths

Set the maximum number of backup paths to keep in the design. For example, if you enter 1, all but the first backup path is removed, leaving only one primary path and one backup path.

Backup Path Type

Set the backup type by selecting Standby, Secondary, or None.

Tertiary Path Option

Enable the creation of a tertiary path by selecting Add 3DIV. Disable the creation of a tertiary path by selecting Remove 3DIV.

To display the tunnels that change in the design session, select Action > Delta Provisioning from the Diverse Path Design window as shown in Figure 1. . To save the design as a report, select Action > Report. To load a diversity design, select Action > Import DivPath definition file.