From: Muhamamd Durrani (dan_schaw@xxxxxxxxx)
Date: Sat Apr 06 2002 - 04:00:57 GMT-3
you should use "bgp always compared Med " command to
force BGP to compare MED for destination from
Different AS systems . By default BGP donot compare
MED for same destinations from neighbors from
different AS.
So R2 must have this command and than verify ur result
....
Regards,
Muhammad
--- Jason <jgraun@attbi.com> wrote:
> Well iBGP as an Admin distance of 200 while eBGP has
> an admin distance
> of 20
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf Of
> Peter Dostal
> Sent: Friday, April 05, 2002 6:58 PM
> To: ccielab@groupstudy.com
> Subject: BGP MED
>
> I have a problem with BGP path selection process.
> Based on the BGP path
> selection process I would say that router R2 should
> choose iBGP path
> over
> eBGP (because of lower MED). Any suggestions?
> Thanks,
>
> Peter
>
>
> R1----FrameRelay----R2
> | |
> ------Ethernet-------
> |
> R3
>
> *********************************************
> hostname R1
> !
> interface FastEthernet1/1
> ip address 192.168.2.3 255.255.255.0
> !
> interface Serial1/0
> ip address 192.168.1.1 255.255.255.0
> encapsulation frame-relay
> no keepalive
> no fair-queue
> frame-relay interface-dlci 100
> !
> router bgp 2
> bgp log-neighbor-changes
> neighbor 192.168.1.2 remote-as 2
> neighbor 192.168.1.2 next-hop-self
> neighbor 192.168.2.1 remote-as 1
> neighbor 192.168.2.1 route-map BGP_MAP in
> no auto-summary
> !
> route-map BGP_MAP permit 10
> set local-preference 100
>
> *********************************************
> hostname R2
> !
> interface FastEthernet0/0
> ip address 192.168.2.2 255.255.255.0
> !
> interface Serial0/0
> ip address 192.168.1.2 255.255.255.252
> encapsulation frame-relay
> no keepalive
> no fair-queue
> frame-relay interface-dlci 100
> !
> router bgp 2
> bgp log-neighbor-changes
> neighbor 192.168.1.1 remote-as 2
> neighbor 192.168.1.1 next-hop-self
> neighbor 192.168.2.1 remote-as 1
> neighbor 192.168.2.1 route-map BGP_MAP in
> no auto-summary
> !
> route-map BGP_MAP permit 10
> set local-preference 100
> !
> *********************************************
> hostname R3
> !
> interface FastEthernet0/1
> ip address 192.168.2.1 255.255.255.0
> !
> interface Loopback0
> ip address 170.2.1.1 255.255.255.240
> !
> router bgp 1
> bgp log-neighbor-changes
> network 170.2.1.0 mask 255.255.255.240
> neighbor 192.168.2.2 remote-as 2
> neighbor 192.168.2.2 route-map BGP_MAP out
> neighbor 192.168.2.3 remote-as 2
> no auto-summary
> !
> route-map BGP_MAP permit 10
> set metric 20
>
> *********************************************
> R1#sh ip bgp
> BGP table version is 8, local router ID is
> 172.10.1.1
> 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
> *> 170.2.1.0/28 192.168.2.1 0
> 100 0 1 i
> * i 192.168.1.2 20
> 100 0 1 i
> *********************************************
> R2#sh ip bgp
> BGP table version is 8, local router ID is
> 192.168.2.2
> 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
> * i170.2.1.0/28 192.168.1.1 0
> 100 0 1 i
> *> 192.168.2.1 20
> 100 0 1 i
> *********************************************
>
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