9. RNC Site Solutions 9.1 Site connectivity solutions There are various options for connection of

2500 WordsApr 23, 201910 Pages
9. RNC Site Solutions 9.1 Site connectivity solutions There are various options for connection of the RNC site to the rest of the operator’s network. In this study only the IP related options shall be studied, thus the only considered scenarios are layer 3 (routed, IP based) and layer 2 (switched, Ethernet) transport. 9.1.1 Layer 3 (routed) backbone and access network In case IP technology is used for both backbone and access transport the whole site connectivity (despite of PSTN and legacy TDM links) can be handled by a single site switch (a redundant switch can be deployed for protection). Connectivity to the MNO’s (core) backbone and the regional access transport is provided by site edge router(s) (SER), which will most likely be…show more content…
By using gateway protection mechanisms (such as VRRP or HSRP; see chapter Error! Reference source not found. for more details) the solution becomes protected against failure of the site device and resilience is remarkably increased. Figure 25: Reference topology for Layer 3 network using redundant multi-layer routers as site equipment 9.1.1.4 Redundant topology with dedicated switches and routers Figure 26: Logical reference topology for Layer 3 network using redundant site switches and routers as site equipment Again, the configuration can also be realized by using dedicated devices as shown in Figure 26. Compared to single switch/router scenario reduced (unit) redundancy requirements apply for the devices, because higher availability is achieved by duplicated hardware. This solution might be cheaper than the previous one. Furthermore, it might be more feasible if routers are already present (e.g. at core sites) or provided by backbone providers. Please note that the figure above shows a logical representation of the topology. For example the connection between the two routers (dotted line) is a layer 3 connection and thus no physical cabling is required. The physical realization of this topology is shown in Figure 27. Interconnection of the two aggregation switches is required for NPGEP switchover (IP address of failing unit is moved to backup unit which is

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