Configuring Manual Bypass Tunnels

Consider the following network setup.

A----B----C----D

| |

E----F

The user first configures the option to disable the dynamic bypass tunnels on node B if required. The CLI for this configuration is:

config>router>mpls>dynamic-bypass [disable | enable]

By default, dynamic bypass tunnels are enabled.

Next, the user configures an LSP on node B, such as B-E-F-C to be 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:

The following LSP configuration options are allowed:

The following example displays a bypass tunnel configuration:

A:ALA-48>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:ALA-48>config>router>mpls>path#

Next, the user configures an LSP from A to D and indicates fast-reroute bypass protection by selecting facility as the FRR method (config>router>mpls>lsp>fast-reroute facility). If the LSP goes through B, and bypass is requested, and the next hop is C, and there is a manually configured bypass-only tunnel from B to C, excluding link BC, then node B uses that.