HI, just to confirm:
Just examining the ISP provider BGP configuration below which I will peer with.
What's the benefit of configuring this prefix list indicatd in red which permits 0.0.0.0/0?
Basically this ISP-TO-ENGR-OUT route-map and respective prefix ISP-TO-ENGR-OUT-PFX will allow all networks to flow, correct?
Can you tell me whether there is benefit of having such route-map and prefix then? I don't get it.
router bgp 200
neighbor 10.1.47.204 remote-as 100
neighbor 10.1.47.204 route-map ISP-TO-ENGR-IN in
neighbor 10.1.47.204 route-map ISP-TO-ENGR-OUT out
!
ip prefix-list ISP-TO-ENGR-OUT-PFX permit 0.0.0.0/0
!
route-map ISP-TO-ENGR-OUT permit 10
match ip address-prefix-list ISP-TO-ENGR-OUT-PFX
!
ip prefix-list ENGR-100-PFX seq 5 permit 10.1.0.0/16
!
!
route-map ISP-TO-ENGR-IN permit 10
match as-path 1
match ip address prefix-list ENGR-200-PFX
set community 200:21098 200:21900
!
