From: gladston@br.ibm.com
Date: Wed Aug 18 2004 - 14:45:52 GMT-3
There is this statement on Halabi's book:
"Note also that aggregated routes will assume the worst origin value of all the component routes"
That is not what happens on IOS 12.2(1d). Any comments?
In the following example, R3 receives the aggregate from R2 with the better origin (internal)
R2 receives 192.168.1.0 (origin ?) and 192.168.2.0 (origin i) from R1 and advertises the aggregate to R3:
r2#sb
BGP table version is 9, local router ID is 172.16.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 172.16.1.0/24 172.16.12.1 0 0 1 i
*> 172.16.2.0/24 0.0.0.0 0 32768 i
*> 172.16.3.0/24 172.16.23.3 0 0 3 i
*> 192.168.0.0/16 0.0.0.0 32768 i
s> 192.168.1.0 172.16.12.1 0 0 1 ?
s> 192.168.2.0 172.16.12.1 0 0 1 i
r2#
r3#sb
BGP table version is 9, local router ID is 172.16.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 172.16.1.0/24 172.16.23.2 0 2 1 i
*> 172.16.2.0/24 172.16.23.2 0 0 2 i
*> 172.16.3.0/24 0.0.0.0 0 32768 i
*> 192.168.0.0/16 172.16.23.2 0 2 i
r3#
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