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. > > > >> 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. > > >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. cheers, --satoru
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