BGP — MED for egress tiebreak

• Routing
• Intermediate
• 8 min
• 2 steps
• Cisco IOS-style

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Free · no install · no account

Scenario

MED (Multi-Exit Discriminator) is BGP's "hint to the neighbour AS about which exit to prefer." Lower wins. MED matters when: - Two ASes peer over multiple links to each other. - Both peers receive the same prefix on both links. - Other attributes (Weight, Local-pref, AS-path length, Origin) are all tied. Then MED is the tiebreak: lowest MED wins. Set MED via outbound route-map on the side that wants its peer to prefer one egress over another: `` route-map TO-R2 permit 10 set metric 50 ← writes the MED on outbound advertisements `` In this lab there's only one R1↔R2 path, so MED won't actually influence path selection — but the configuration shape (route-map → set metric → neighbor out) is identical to a multi-homed scenario.

Topology

2 × router · Cisco IOS-style

• R1 — router
• R2 — router

What you will do

1. On R1, define route-map MED-OUT permit 10 with set metric 50 and bind outbound to R2.

2. On R2, run show ip bgp 192.168.1.0. The detail view should report MED 50 on R1's advertisement.

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This lab in other languages

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