Routing Protocol Authentication is used to prevent illegitimate sources from poisoning routing information within our devices’ routing tables. In this manner, only authorized routing peers are able to exchange updates.
Though each routing protocol has marked differences in how they authenticate, each packet is generally authenticated using the authentication configuration applied to the routing process.
There are two types of routing protocol authentication:
- Plain-text authentication
- Hash-based authentication
By default, no authentication is used for routing protocol packets. It must be manually configured by the administrator.
Stuck-in-Active: Journal of an IT-Network Administrator 