Corridor Narrow Gap Fallback

Gallery / Inter-section Routing

A left-entry feed crosses two rows past a wider intervening section whose inter-row gap is too narrow for the corridor's clearance band, so it falls back to the around-below loop clear of that section while the adjacent feeder takes the corridor (issue #722).

Mermaid source

%%metro title: Corridor Narrow Gap Fallback
%%metro style: dark
%%metro line: a | A | #e63946
%%metro line: b | B | #0570b0

%%metro grid: source | 2,0
%%metro grid: tall | 2,1
%%metro grid: target | 1,2

graph LR
    subgraph source [Source]
        s1[Input]
        s2[Process]
        s1 -->|a,b| s2
    end

    subgraph tall [Tall Section]
        %%metro entry: left | a
        k1[Step A]
        k2[Step B]
        k3[Step C]
        k4[Step D]
        k1 -->|a| k2
        k2 -->|a| k3
        k3 -->|a| k4
    end

    subgraph target [Target]
        %%metro entry: left | a, b
        t1[Process]
        t2[Output]
        t1 -->|a,b| t2
    end

    s2 -->|b| t1
    s2 -->|a| t1
    k4 -->|a| t1

CLI command

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

Rendered map