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Making Specifications for Fast Reroute

 

Suppose a tunnel has requested fast reroute (FRR) protection, and one of the links on which it is routed over fails. The information about the link failure may take a while to reach the tunnel’s source node. In this case, data routed over the tunnel will continue to head toward the failed link. With fast reroute, you can specify a backup tunnel around the protected link. Then the traffic can go along the backup tunnel to get around the failed link until the tunnel reroutes in a way that avoids the failed link.

Note

The fast reroute option should only be used for hardware that supports fast reroute.

Figure 1: Tunnel Type Parameter Generation Window
Tunnel Type Parameter Generation Window

FRR Tab Field

Description

Fast Reroute (Cisco)

Specifies that this tunnel requires FRR protection.

FRR Link Protected (Juniper)

Indicates that the Juniper primary tunnel is subject to link protection.

FRR Node-Link Protected (Juniper)

Indicates that the Juniper primary tunnel is subject to node-link protection.

FRR Link Backup Tunnel

Specifies that this tunnel is created for FRR Link Backup purposes.

FRR Node Backup Tunnel

Specifies that this tunnel is created for FRR Node Backup purposes.

BKBW

Indicates how much bandwidth the FRR backup tunnel is configured to protect.

BKGP

Indicates how much Global Pool bandwidth the FRR backup tunnel is configured to protect. This is for Cisco only.

BKSP

Indicates how much Sub Pool bandwidth the FRR backup tunnel is configured to protect. This is for Cisco only.

To specify that a tunnel has requested for fast reroute protection, select the Fast Reroute checkbox in the Tunnel Type window.

To add backup tunnels for links carrying the tunnels requesting FRR protection, see Paragon Planner Fast Reroute Overview. Note that the FRR Backup Tunnel checkboxes in the Tunnel Type window are grayed out but will reflect changes when you successfully add the FRR_A or FRR_Z field in the link window MPLS TE tab. .