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Answer» Following are the different types of attributes PRESENT in BGP: - Well-known mandatory: All BGP peers recognise it, it is forwarded to all peers, and it is present in all Update messages. The following are some of the well-known mandatory attributes :
- Well-known DISCRETIONARY: All ROUTERS recognise it, it's sent to all peers, and it's optionally included in the Update message. The following are some of the well-known discretionary attributes :
- LOCAL Preference
- Atomic Aggregate
- Optional transitive: It's possible that BGP routers will recognise it and transmit it on to BGP peers. When optional transitive qualities are not recognised, they are denoted as partial. The following are examples of optional transitive attributes:
- Optional non-transitive: BGP routers may recognise it, but it is not forwarded to peers. The following are some of the optional non-transitive attributes :
- Multi-exit discriminator (MED)
- Originator ID
- Cluster-ID
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