Hi All,
I have question regarding that part of task
Configure AS 200 so that all traffic from AS 100 destined to this prefix
traverses the Ethernet segment between SW4 and R5.
• In the case that the link between SW4 and R5 is down traffic destined for
the 150.X.11.0/24 prefix should transit the Frame Relay link between R2
and R3.
• Do not use AS-PATH prepending to accomplish this.
Acording to the solution there is configuration for MED on the SWR as below
ip prefix-list R1_BGP_LOOPBACK seq 5 permit 150.1.11.0/24
!!
SW4 sets R1’s new loopback metric to 100, which is better
! than R2’s setting of 200. This will make AS 100 prefer to go
! via R5 to reach R1’s new loopback
!
route-map MED permit 10
match ip address prefix-list R1_BGP_LOOPBACK
set metric 100
!
route-map MED permit 1000
!
router bgp 200
neighbor 183.1.105.5 route-map MED out
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I was wondering if this really necessary. If I configure higher MED on the R2 and then R2 sends it out to the R3 it will be enough to influence route decision process for the AS100.
Please clarify this for me why INE put additional configuration on the BGP session between SW4 and R5