Dual-Homed BGP Edge Routing Architecture

Network Design diagram · made in Skemio

BGP multihoming network diagram with two edge routers peered over iBGP, connecting upstream to ISP A (Primary) and ISP B (Backup).

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What it shows

Local Preference directs outbound traffic through the preferred primary ISP.
AS-Path prepending makes backup paths look longer to inbound traffic.
eBGP handles external exchanges; iBGP syncs routing state between edge pairs.

The takeaway

Control outbound traffic with Local Preference; control inbound traffic with AS-Path prepending.

#BGP
#Routing
#NetworkEngineering
#DataCenter
#Infrastructure
#Internet

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