Hello @carl_townshend ,
>> So what does VPLS do in regard to flooding BUM traffic vs EVPN?
in VPLS the network engineer has to take care of BUM flooding by limiting this type of traffic in EVPN the more advanced signaling avoids the need for BUM flooding.
>> Does VPLS always need BGP?
No, BGP is not always needed in VPLS there are three options / implementations:
a) manual neighbor provisioning that uses LDP to build pseudowires between configured neighbors. Difficult to manage when adding a new site/PE a change is needed in all other sites.
b) VPLS LDP with MP BGP autodiscovery, it uses a special BGP address family with the only objective to find interesting neighbors by using the route target concept then LDP is used to build a full mesh of pseudowires with all those PE that have advertised their site-ids using the same route-target value.
c) VPLS using MP BGP and MP BGP autodiscovery: a different address family is used the basic idea is the same but pseudowires are built in automatic by MP BGP using the concept of base label and Site-id.
A remote PE will use an internal MPLS label VC label = base label + its own site-id#.
>> Also with EVPN, is this the same as Eompls?
No, EoMPLS refers to the first L2 service uses LDP and it is point to point in nature. EVPN is not limited to point to point topology like VPLS.
Hope to help
Giuseppe
