Merge Trunk Over Low Section

Gallery / Merge & Convergence

A same-row merge trunk bypasses past a tall intervening section while a lower-row section sits within the merge column range. The inter-row gap clears the lower section's header, so the trunk (and its branches) route through that gap rather than diving below the whole canvas.

Mermaid source

%%metro title: Merge Trunk Over Low Section
%%metro style: dark
%%metro line: flow | Flow | #0570b0
%%metro line: side | Side | #2db572

%%metro grid: ingest | 0,0
%%metro grid: tall | 1,0
%%metro grid: proc2 | 2,0
%%metro grid: collect | 3,0
%%metro grid: sub | 2,1

graph LR
    subgraph ingest [Ingest]
        i1[Read]
        i2[Split]
        i1 -->|flow,side| i2
    end

    subgraph tall [Tall]
        ta[Branch]
        tb1[Path A]
        tb2[Path B]
        tb3[Path C]
        ta -->|flow| tb1
        ta -->|flow| tb2
        ta -->|flow| tb3
    end

    subgraph proc2 [Proc 2]
        q1[Step]
    end

    subgraph collect [Collect]
        c1[Gather]
        c2[Report]
        c1 -->|flow| c2
    end

    subgraph sub [Sub]
        d1[Aux]
        d2[Done]
        d1 -->|side| d2
    end

    i2 -->|flow| ta
    i2 -->|flow| c1
    tb1 -->|flow| q1
    tb1 -->|flow| c1
    q1 -->|flow| c1
    i2 -->|side| d1

CLI command

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

Rendered map