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

The user first configures the option to disable the dynamic bypass tunnels.

Listed below are the steps to configure the manual bypass tunnels.

Procedure

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.
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.
Note that 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.