well-know mandatory bgp attribute

[wfqk]

Hi, as we know, well-known mandatory includes as-path, origin, next-hop, and well-known discretionary inlucdes loc_pre, atomic-aggregate

How can we understand the "well-know" in it? Can we say that every bgp peer know it very well? thank you

[Georg Pauwen · Accepted solution]

Hello,

'well known' simply means that these attributes are implemented by all vendors. So whether you have Alcatel, Cisco, Juniper, or whatever vendor BGP implementation, the well known attributes are used by all.

The difference between mandatory and discretionary is that mandatory attributes MUST be included in all updates, while discretionary attributes do not have to...