BGP manages security policies by using access control lists (ACLs) and route filtering to control the flow of traffic between border routers. BGP can filter routes based on different criteria, such as the prefix length, the origin of the route, the AS path, and the next hop. This allows network administrators to control which routes are advertised and received by their routers, preventing unauthorized routes or known bad routes from propagating through the network.
In addition, BGP also supports authentication mechanisms, such as MD5, to prevent unauthorized routing updates. It can also use virtual private network (VPN) and multi-protocol label switching (MPLS) to ensure secure connectivity between different networks.
Overall, BGP’s security policies allow network administrators to ensure that their network is only receiving and forwarding secure and authorized routing updates, which increases the overall security of the network.
