HP 10500 SERIES Configuration Manual page 107

Protected LSP—A primary LSP to be protected.
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Bypass LSP—An LSP used to protect primary LSPs.
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• Point of local repair (PLR)—The ingress node of a bypass LSP. It must be located on a protected LSP
but must not be the egress node.
Merge point (MP)—The egress node of the bypass LSP. It must be located on a protected LSP but
•
must not be the ingress node.
Protection
FRR provides link protection and node protection for an LSP.
Link protection—The PLR and the MP are connected through a direct link and the primary LSP
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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 29 FRR link protection
Node protection—The PLR and the MP are connected through a device and the primary LSP
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traverses this device. When the device fails, traffic is switched to the bypass LSP. As shown in
30, 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 30 FRR node protection
Deploying FRR
When configuring the bypass LSP, make sure the protected link or node is not on the bypass LSP.
As bypass LSPs are pre-established, FRR requires extra bandwidth. When network bandwidth is
insufficient, use FRR for crucial interfaces or links only.
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Figure 29,
Figure