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 originated from AS 65001 only propagated to AS 65002. Therefore the MED for the is not shown in the BGP routing table on RT3.
RT3#sh ip bgp
BGP table version is 4, local router ID is
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
*>                             0 65002 65001 i
*>               0             0 65002 i
*>                  0         32768 i

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