Version

Version
The Version field is 1 byte long and is used in determining the version of BGP for the
neighbors to use. BGP speakers will attempt to negotiate the highest version number that both
BGP speakers support. If a version number is specified in the version field that the other BGP
speaker does not support, an error message will be returned to the sender and the TCP session will
be torn down. The TCP session is then established again, and the version number is lowered. This
process continues until a common version number is reached.