Tuesday, October 11, 2011

The Propagation of the MED Attribute


The network setup above is used to demonstrate the propagation of the MED attribute across ASes. The MED value for 192.168.1.0/24 originated from AS 65001 only propagated to AS 65002. Therefore the MED for the 192.168.1.0/24 is not shown in the BGP routing table on RT3.
RT3#sh ip bgp
BGP table version is 4, local router ID is 192.168.3.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*> 192.168.1.0      23.23.23.2                             0 65002 65001 i
*> 192.168.2.0      23.23.23.2               0             0 65002 i
*> 192.168.3.0      0.0.0.0                  0         32768 i
RT3#

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