Hi Behcet,
On Thu, May 22, 2014 at 12:58 AM, Behcet Sarikaya <sarikaya2...@gmail.com>wrote: -- snip -- > >> >> Referring to Steps 14 and 15 in Figure 4, in Step 14, Route Update (I > >> >> guess BGP Route Update) is initiated by > >> >> which node and is going to which node? > >> > > >> > As you see step 14 in the sequence, any specific node aren't assumed > to > >> > initiate routing update on vEPC side, due to the scope of the draft, > >> > EPC-E > >> > router is the receiving node of routing update > >> > >> You mean more than one node can initiate it, my question was which > >> node(s)? > >> > > > > I meant that the draft doesn't mention exactly which node advertise > that, it > > could be expected to exist in the vEPC side. But I find that in terms of > > usual BGP operation, that node could be Route-Reflector(RR), or > > Route-Server(RS). > > Just one case would be expected that a set of information which includes > an > > endpoint information of tunnel and an UE assigned prefix is informed > from a > > mobility management node in the vEPC to RR or RS. > > > > Are you sure? > How would RR or RS know about UE mobility? > > I was expecting you to say MME? > > Ah, I see what you mean. Yes, I'm sure that RR/RS just only know about routes, nor whole mobility information exists. When I see a node which plays MME role, the node could also be a BGP speaker to export the mobility info transformed to the routes. > > > >> > >> > > >> >> In Step 15 you have EPC-E initiating this and it is going towards > RTR. > >> >> Why > >> >> is this not sufficient? i.e. since EPC-E > >> >> can detect mobility? > >> >> Why do you need Step 14? > >> > > >> > The reason of the EPC-E advertise route toward RTR is that EPC-E can > >> > aggregate multiple UE's prefixes into less BGP routes as a part of > >> > normal > >> > routing operation within operator's network. > >> > >> You mean host routes are not needed in the upstream BGP routers? How > >> does that work? > > > > > > Yes, host routes are not needed in the upstream routers because > aggregated > > routes EPC-E router advertised work well for the upstream routers to send > > out packets toward advertising EPC-E routers. > > > > Isn't it kind of host routes? Maybe host prefixes? Otherwise I can not > image how you would route to UEs that are topologically incorrect? > What do you mean by "topologically incorrect"? Is that the assigned prefixes are disordered to be aggregated? cheers, --satoru
_______________________________________________ dmm mailing list dmm@ietf.org https://www.ietf.org/mailman/listinfo/dmm
