All Border Gateway Protocol messages all share a common header which is 19-bytes long. The Border Gateway Protocol packet header contains three fields, which are shown in Figure 6-9:
Fig. 6-9. The BGP Message Header
The 16-byte Marker field is used to detect a loss of synchronization between two BGP speakers, as well as to authentic incoming BGP messages. If the message is an OPEN message, or if the OPEN message . . .
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