BGP Update Messages

Unfeasible Routes Length (2 Octets)

Withdrawn Routes (Variable)

Total path Attribute Length (2 Octets)

Network Layer Reachability Information (Variable)

Path Attributes (Variable)

The BGP UPDATE Message

Length (I Octet)

Prefix (Variable)

Attribute Type

Length (I Octet)

Prefix (Variable)

Attribute Length

Attribute Value

• A BGP update is used to advertise a single feasible route to a peer, or to withdraw multiple unfeasible routes

• Each update message contains attributes, like origin, AS-Path, Next-Hop, …….

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