On Thu, Dec 8, 2011 at 6:31 AM, Lorenzo Colitti <lore...@google.com> wrote:
> On Mon, Dec 5, 2011 at 11:25, Tao Sun <hisun...@gmail.com> wrote: > >> 4) Using RA to configure the route may cause potentially some messy. In >> 4G cellular network, both GTP and PMIP protocal are used for mobility >> management today. In GTP, it is a point-to-point link between mobile host >> and PGW. However, in PMIP, PGW send /64 prefix to SGW through PBA. The SGW >> sends RA to mobile host. If RA is also used for route configuration, how >> SGW obtains the specific route information? how about the complexity due to >> the large number of SGW as compared with PGW? how the SGW combine the >> multiple RA route informatio nreceived from sources in use case 2 >> since there is always only one SGW at a time? ... >> > > I'm not sure I understand this. Why can't you configure the SGW to include > the RIO in the RA no matter what? If what you're doing is saying that > certain carrier services must be on certain interfaces, then the more > specific route(s) don't need to be different for each user, right? > [Tao]You can configure the PGW. However, you cannot configure SGW. A SGW has no idea what PDN the user will connect to. A user can connect to multiple PDNs through corresponding PGWs simultaneously, but only across one single SGW. Yes, but the specific route for each PDN is different.
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