Seed72 Cross Family Fan

Gallery / Fan-out and Fan-in

A reduction of frozen recovery seed 72. One divergence feeds a normal dogleg around an intervening section and an exempt continuation into a reverse-flow target; both routes must leave through one ordered fan frame without crossing.

Mermaid source

%%metro title: Cross-family Fan from Frozen Seed 72
%%metro style: dark
%%metro line: through | Through blocker | #4cda26
%%metro line: normal | Normal dogleg | #8453d7
%%metro line: exempt | Exempt continuation | #3779b1
%%metro grid: source | 0,0
%%metro grid: blocker | 1,0
%%metro grid: normal_target | 2,0
%%metro grid: exempt_target | 1,2

graph LR
    subgraph source [Source]
        prepare[Prepare]
        split[Split]
        prepare -->|through,normal,exempt| split
    end

    subgraph blocker [Intervening work]
        blocked_in[Blocked in]
        blocked_out[Blocked out]
        blocked_in -->|through| blocked_out
    end

    subgraph normal_target [Normal target]
        normal_in[Normal in]
    end

    subgraph exempt_target [Reverse-flow target]
        %%metro direction: RL
        %%metro entry: right | exempt
        exempt_in[Exempt in]
        exempt_done[Exempt done]
        exempt_in -->|exempt| exempt_done
    end

    split -->|through| blocked_in
    split -->|normal| normal_in
    split -->|exempt| exempt_in

CLI command

nf-metro render examples/topologies/seed72_cross_family_fan.mmd -o seed72_cross_family_fan.svg

Rendered map