Left Exit Fan Perp Entry Landing

Gallery / Inter-section Routing

A LEFT-exit two-line bundle drops into a shared TOP entry whose downstream fan peels each line to a different target. The fan-out's peel order propagates one hop upstream to its free source feeder, so both lines descend straight into their landing lanes with no crossing (issue #1986).

Mermaid source

%%metro title: Left-exit fan perp-entry landing
%%metro line: g | Green | #2db572
%%metro line: h | Blue | #3f7fdf
%%metro grid: a | 1,0
%%metro grid: b | 1,1
%%metro grid: c | 1,2
%%metro grid: d | 0,1

graph LR
    subgraph a [Alpha]
        %%metro exit: left | g, h
        a1[A one]
        a2[A two]
        a1 -->|g,h| a2
    end
    subgraph b [Beta]
        %%metro entry: top | g, h
        %%metro exit: left | g, h
        b1[B one]
        b2[B two]
        b1 -->|g,h| b2
    end
    subgraph c [Gamma]
        %%metro entry: top | g
        c1[C one]
        c2[C two]
        c1 -->|g| c2
    end
    subgraph d [Delta]
        %%metro entry: right | h
        d1[D one]
        d2[D two]
        d1 -->|h| d2
    end
    a2 -->|g,h| b1
    b2 -->|g| c1
    b2 -->|h| d1

CLI command

nf-metro render examples/topologies/left_exit_fan_perp_entry_landing.mmd -o left_exit_fan_perp_entry_landing.svg

Rendered map