Fanout Intersection Shared Channel

Gallery / Inter-section Routing

A source fans out at a junction to two stacked sections below it, and the two feed routes co-travel a shared horizontal inter-section channel before peeling into a top entry and a left entry. The co-travelling lines keep one `OFFSET_STEP` apart on the shared run rather than collapsing to a half-step overlay when the inter-row gap is too narrow to reserve a shared fan corridor.

Mermaid source

%%metro title: Fan-out inter-section shared channel
%%metro style: nfcore
%%metro line: l1 | Line 1 | #e6007e
%%metro line: l2 | Line 2 | #2db572
%%metro grid: src | 1,0
%%metro grid: sec_c, sec_d | 0,1

graph LR
    subgraph src [Source]
        %%metro exit: right | l1, l2
        s_a[Ingest]
        s_b[Prepare]

        s_a -->|l1,l2| s_b
    end

    subgraph sec_c [Top target]
        %%metro entry: top | l2
        c_a[Call]
        c_b[Report]

        c_a -->|l2| c_b
    end

    subgraph sec_d [Lower target]
        %%metro entry: left | l1
        d_a[Assemble]
        d_b[Merge]

        d_a -->|l1| d_b
    end

    %% One source fans to two stacked sections; the feeds drop to a shared
    %% horizontal channel and co-travel it before peeling into a top entry (l2)
    %% and a left entry (l1).
    s_b -->|l2| c_a
    s_b -->|l1| d_a

CLI command

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

Rendered map