BGP OPEN ( mismatch )

With BGP the BGP-OPEN message is always the 1st message that starts the BGP establishment. If you have an improper BGP peer configuration, a notification message will be sent. Common issues seen

   improper BGP ASN

   improper BGP peer-addr

   improper secret

Did you know that if the BGP speakers are not configured tfor the same AFI/SAFWill this throw an error? The BGP capabilities must match

e.g

side A

side B

The resulting error notification

So always check that the negotiated AFI/SAFI between peers is a 100% match

NSE ( network security expert) and Route/Switching Engineer

kfelix  -----a----t---- socpuppets ---dot---com

     ^      ^

=(  @  @ )=

         o

        /  \