Configuring manual bypass tunnels

About this task

Consider the network setup in the following figure that shows nodes A through F.

Figure: Manual bypass tunnels

Procedure

The user first configures the option to disable the dynamic bypass tunnels.
Listed below are the steps to configure the manual bypass tunnels:
1. Configure the option to disable the dynamic bypass tunnels on the 7210 SAS node B (if required). The CLI for this configuration is: config>router>mpls>dynamic-bypass [disable | enable] The dynamic bypass tunnels are enabled by default.
2. Configure an LSP on node B, such as B-E-F-C which is used only as bypass. The user specifies each hop in the path, for example, the bypass LSP has a strict path.
Including the bypass-only keyword disables the following options under the LSP configuration:
- bandwidth
- fast-reroute
- secondary
The following LSP configuration options are allowed:
- adaptive
- adspec
- cspf
- exclude
- hop-limit
- include
- metric
Example Bypass tunnel configuration output
```
A:7210 SAS>config>router>mpls>path# info
-------------------------------------------
       ...
       path "BEFC"
               hop 10 10.10.10.11 strict
               hop 20 10.10.10.12 strict
               hop 30 10.10.10.13 strict
               no shutdown
       exit

       lsp "bypass-BC"
               to 10.10.10.15
               primary "BEFC"
               exit
               no shutdown
       ...
-------------------------------------------
A:7210 SAS >config>router>mpls>path#
```
Configure an LSP from A to D and indicate fast-reroute bypass protection, select the facility as ‟FRR method” (config>router>mpls>lsp>fast-reroute facility).
Observe if the following criteria apply:
- If the LSP passes through B
- A bypass is requested
- The next hop is C
- A manually configured bypass-only tunnel exists from B to C (excluding link B to C)

Expected outcome

Node B uses the manually configured bypass-only tunnel from B to C.