Well Known :- All BGP
implementations must understand and support it. It cannot be ignored.
- Mandatory:- Must be present in all update and all will support it
- Discretionary:- It can or cannot be present in update(optional) but all implementations must support it.
Optional:- It is not mandatory to include and
support it.
- Transitive:- Can travel from one AS to another.
- Non-Transitive:- If received a router from peer then it will not be passed to its peer.
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