System information

Configuring BGP
12-3
4. Router Los Angeles adds its own AS to the AS path and forwards to Router
Miami.
5. Router Miami receives the route and ascertains that it comes from another AS.
6. Router Miami adds its own AS to the AS path and forwards the route to Router
Dallas.
7. Router Dallas receives the route, determines that the route is a loop since its own
AS is contained in the AS path, and discards the route.
You can configure BGP operating parameters manually. BGP selects among different
routes by comparing specific path attributes or metrics for each route. The local
administrator can configure each of these and assign them different values.
Figure 12-1 Advertising BGP Routes
AS 100
AS 200
LA
AS 300
Miami
bgp0003
Boston
NY
Dallas
IBGP
EBGP
EBGP
IBGP
1
2
EBGP
4
3
5