3Com S7906E Configuration Manual page 1684

A bypass tunnel cannot be used for services like VPN at the same time.
Configuration Prerequisites
Before configuring FRR, do the following:
Configure IGP, ensuring that all LSRs are reachable
Configure MPLS basic capabilities
Configure MPLS TE basic capabilities
Establish an MPLS TE tunnel with RSVP-TE
Set up primary LSPs
Configuration Procedure
Configuring FRR involves these tasks:
Enabling FRR on the headend of a primary LSP
Configuring a bypass tunnel on its PLR
Configuring node protection
Configuring the FRR polling timer
Enabling FRR on the headend of a primary LSP
Follow these steps to enable FRR on the headend of a primary LSP:
To do...
Enter system view
Enter tunnel interface view of
the primary LSP
Enable FRR
Submit current tunnel
configuration
Configuring a bypass tunnel on its PLR
After a tunnel is specified to protect an interface, its corresponding LSP becomes a bypass LSP. Setting
up a bypass LSP must be manually performed on its headend, also called point of local repair (PLR),
which must be a part of the primary LSP but must not be the tail of the primary LSP.
Configuring a bypass LSP is the same as configuring a common LSP except that you cannot configure
the FRR attribute on a bypass LSP. In other words, an LSP cannot be both primary and bypass. In
addition, nested LSP protection is not allowed.
When specifying a bypass tunnel for an interface, make sure that:
The bypass tunnel is up.
The protected interface is not its own outgoing interface.
Up to three bypass tunnels can be specified for a protected interface. The best-fit algorithm is used to
determine which of them should be used in case failure occurs.
Your device has restriction on links that use the same bypass tunnel so that their total bandwidth does
not exceeds a specified value.
Use the command...
system-view
interface tunnel
tunnel-number
mpls te fast-reroute
mpls te commit
1-35
Remarks
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Required
Disabled by default
Required