BGP - ATTRIBUTES

In this session we will explore the different types of attributes that BGP uses, we will see what are the characteristics and scope of each of them, along with some examples.

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Well-known Mandatory: They must be recognized by all of the BGP speaking devices. The attributes must be included on all of the UPDATE messages.
Examples: AS-Path, Origin and Next-hop.
Well-known Discretionary: They must be recognized by all of the BGP speaking devices. The attributes may or may not be included on the UPDATE messages.
Examples: Local-Preference and Atomic-Aggregate
Optional Transitive: They may or may not be recognized by the BGP speaking devices. The attributes must be preserved and published to other neighbors even if they aren't recognized.
Examples: Aggregator and Community
Optional Non-Transitive: They may or may not be recognized by the BGP speaking devices. If an announcement is received with one of these attributes, it must not be published to other neighbors if it's not recognized locally. 
Examples: Multiexit-discriminator (MED), Originator-ID and Cluster-id

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Global

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