Setting BGP metric to 0 via Route Map = Null

From: Troy (ta_levin@yahoo.com)
Date: Thu Oct 21 2004 - 16:05:03 GMT-3

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I am trying to use and inbound route-map to set BGP routes to a metric of zero. However it appears that the route-map actually is setting the metric to a NULL value. Is this to be expected?
 
.....it looks as though the 'set metric 0' is actually setting the metric to "null"
 

example:

r2#show run | b router bgp
router bgp 200
 no synchronization
 bgp log-neighbor-changes
 neighbor 65.1.1.1 remote-as 100
 no auto-summary

r2#show ip bgp
BGP table version is 2, local router ID is 65.1.1.2
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
*> 1.1.1.1/32 65.1.1.1 0 0 100 i

***********************************************

****Example with route-map

router bgp 200
 no synchronization
 bgp log-neighbor-changes
 neighbor 65.1.1.1 remote-as 100
 neighbor 65.1.1.1 route-map med in
 no auto-summary
!
route-map med permit 10
 set metric 0

r2#
8w0d: %BGP-5-ADJCHANGE: neighbor 65.1.1.1 Up
r2#show ip bgp
BGP table version is 2, local router ID is 65.1.1.2
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
*> 1.1.1.1/32 65.1.1.1 0 100 i <-----IOS unable to set metric to zero....thus creating null value

***********************************************

-Config with "bgp bestpath med missing-as-worst" added

r2#show run | b router bgp
router bgp 200
 no synchronization
 bgp log-neighbor-changes
 bgp bestpath med missing-as-worst
 neighbor 65.1.1.1 remote-as 100
 neighbor 65.1.1.1 route-map med in
 no auto-summary

!
route-map med permit 10
 set metric 0

r2#show ip bgp
BGP table version is 2, local router ID is 65.1.1.2
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
*> 1.1.1.1/32 65.1.1.1 4294967294 0 100 i <-----metric set at worst

                
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