Hi,

2nd post in the quick series is about BGP community no-advertise

Community – No-Advertise

“No-Advertise is similar to No-export, While no-export does not export routes to another AS, this goes further and it will not export route to both ebgp or ibgp neighbors as well.”

Requirement – Make sure R1 advertises its routes to R2, and R2 should not advertise the routes to either EBGP or IBGP neighbors

Topology

TOPOLOGY

Before confiuring anything

before-community

 

ON R1

 

access-list 99 permit host 1.1.1.1

route-map NO-ADV-COMM permit 10
match ip address 99
set community no-advertise

router bgp 100
nei 9.9.12.2 route-map NO-ADV-COMM out

final

 

Regards

Rakesh