HP 12500 Series Configuration Manual page 58

Once a link or node on an LSP configured with FRR fails, traffic is switched to the protection link and the
ingress node of the LSP starts attempting to set up a new LSP.
Basic concepts
The following are concepts that FRR involves throughout this document:
Primary LSP: The protected LSP.
•
• Bypass LSP: An LSP used to protect the primary LSP.
Point of local repair (PLR): The ingress of the bypass LSP. It must be located on the primary LSP but
•
must not be the egress.
Merge point (MP): The egress of the bypass LSP. It must be located on the primary LSP but must not
•
be the ingress.
Protection
FRR provides link protection and node protection for an LSP.
• Link protection, where the PLR and the MP are connected through a direct link and the primary LSP
traverses this link. When the link fails, traffic is switched to the bypass LSP. As shown in
the primary LSP is Router A → Router B → Router C → Router D, and the bypass LSP is Router B →
Router F → Router C.
Figure 18 FRR link protection
Node protection, where the PLR and the MP are connected through a device and the primary LSP
•
traverses this device. When the device fails, traffic is switched to the bypass LSP. As shown in
19, the primary LSP is Router A → Router B → Router C → Router D → Router E, and the bypass LSP
is Router B → Router F→ Router D. Router C is the protected device.
Figure 19 FRR node protection
Deploying FRR
When configuring the bypass LSP, make sure the protected link or node is not on the bypass LSP.
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Figure 18,
Figure