Hi Satoru, Thanks again.
Please see my replies inline. Regards, Behcet On Tue, May 20, 2014 at 8:47 PM, Satoru Matsushima <satoru.matsush...@gmail.com> wrote: > Hi Behcet, > > > On Wed, May 21, 2014 at 1:17 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? > >> >> > >> >> 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? > >> >> >> >Step 14 makes EPC-E not to >> > detect mobility directly. >> >> I understand that. >> >> > >> >> For the uplink traffic from UE, you seem to assume that it is always >> >> towards RTR. Could it not be directed to >> >> another UE? What happens in that case? >> > >> > When an EPC-E router has a route for destination of the packet from UE, >> > the >> > EPC-E router forward the packet to the destination. >> >> You mean to another EPC-E? >> > > I just meant that the packets are always forwarded along with the routing > table of each node. > Yes, I think that the packet to another UE would be routed downstream before reaching the RTR. > cheers, > --satoru _______________________________________________ dmm mailing list dmm@ietf.org https://www.ietf.org/mailman/listinfo/dmm
