Cisco BGP MED Configuration

Cisco BGP MED Configuration using Dynamips/Dynagnen

Topology

Configuration Settings Overview

BGP MED(Multi Exit Discriminator) Attribute
AS65001 specifies the entrance of its own AS to AS65000 by metric for 5.5.5.5/32.

show bgp ipv4 unicast (Excerpt from show command below)

R1#sh bgp ipv4 unicast
     Network      Next Hop    Metric  
 *>i 5.5.5.5/32   11.11.11.11      5  ===> smaller metric
 *>i 10.5.5.0/24  10.10.10.10      0  ===> lowest BGP router-id
 * i              11.11.11.11      0

R10#sh bgp ipv4 unicast
     Network      Next Hop    Metric  
 *>i 5.5.5.5/32   11.11.11.11      5  ===> smaller metric
 *                10.2.10.2       10  
 * i 10.5.5.0/24  11.11.11.11      0  
 *>               10.2.10.2           ===> prefer eBGP route

R11#sh bgp ipv4 unicast
     Network      Next Hop    Metric  
 *>  5.5.5.5/32   10.3.11.3        5  ===> smaller metric
 * i 10.5.5.0/24  10.10.10.10      0  
 *>               10.3.11.3           ===> prefer eBGP route

Dynagen Config File / Router Config

(1) Dynagen .net file

(2) R1

(3) R2

(4) R3

(5) R4

(6) R5

(7) R10

(8) R11

show command

R1  : sh ip route
    : sh bgp ipv4 unicast summary
    : sh bgp ipv4 unicast
R10 : sh ip route
    : sh bgp ipv4 unicast summary
    : sh bgp ipv4 unicast
R11 : sh ip route
    : sh bgp ipv4 unicast summary
    : sh bgp ipv4 unicast

(1) R1

(2) R10

(3) R11

Dynalconf HOME