SR OS supports TPSDA functionality over GTP access funnels toward eNodeBs using the S11 (GTPv2-C) and S1-U (GTP-U) interfaces toward MME and eNodeB. In this setup, as shown in Figure: GTP access, the SR OS router performs the roles of BNG, SGW, and PGW. Both IPv4 and IPv6 connectivity over GTP is supported. GTP session authentication can be performed using LUDB, RADIUS, or NASREQ. GTP access termination is built on top of forwarding path extensions.
Figure: GTP access
