1/7 Introduction to various Mark Wallis Atlas Gentech o3/May/2o1o LAN configurations for

2/7 Scenario 1 Standard Topology Usage: MFIM IP is routable from the clients Network, but iPECS Devices exist on the iPECS `System IP Range` This is the normal installation topology for iPECS. Advantages: Keep Clients IP Address space free. IP Addresses for iPECS Devices & Client network can’t conflict. Local Phontage Devices do not use an IP Channel Disadvantages: Under some circumstances there can be routing problems between Client PC’s Phontage and iPECS System IP assigned Devices (see note) LGCM MFIM Ext Ext IP Network Ext Client PCs Assigned range To Client Servers And fixed peripherals Assigned Range To Client Routers Assigned range To iPECS Devices System IP range /24 iPECS Dual Plane IP Topology / /24 MFIM + Client Network iPECS Devices Note: For best voice packet transmission for Phontage Devices ( /24), input a second system IP Address ( / ) otherwise in local mode, only 1 Phontage can communicate with the LGCM (although communication with local IP phones is fine) Broadcast Domain

3/7 Scenario 2 Flat Topology Usage: MFIM IP and all its devices are routable on (or exist on) the iPECS `System IP Range`. i.e. they are all part of the same IP Subnet This is common where Local/Remote working is desired (eg for a company VPN) Advantages: All Devices are routable – suits the use of Local/Remote sate for distant devices Disadvantages: Uses IP Addresses on the clients network (IP Address space can be insufficient, either for the client devices or iPECS devices). Conflicts in IP Addressing with clients devices are possible. LGCM MFIM Ext Ext IP Network Ext Client PCs Assigned range To Client Servers And fixed peripherals Assigned Range To Client Routers Assigned range To Flat Plane IP Topology / /24 MFIM, iPECS Devices + Client Network A Local Remote Network (Routable by a non- NAT/NAPT router) /24 Broadcast Domain

4/7 Scenario 3 Concurrent Topology Usage: MFIM IP and all its devices are on the same IP network, but the Client’s devices are on a different IP network (although the same physical network). A router can be employed to allow routing between the networks. It is generally not employed (except as part of scenario 1). Advantages: Like a VLAN it segregates routable Networks, has low possibility of IP Address conflict, utilises same LAN switch devices for both networks Disadvantages: Unlike a VLAN, it does not help in bandwidth management. A router is required if IP communication between iPECS and Client network is required. Has a large broadcast domain. LGCM MFIM Ext Ext IP Network Ext Client PCs Assigned range To Client Servers And fixed peripherals Assigned Range To Client Routers Assigned range To iPECS Concurrent IP Topology / /24 Client Network MFIM + iPECS Devices Broadcast Domain Physical but not Logical connection

5/7 Scenario 4 VLAN Topology Usage: MFIM IP and Devices are on a VLAN built for ‘voice’ & inhabit the same IP Network, while the client’s devices inhabit a different ‘data’ VLAN. Again a router can be employed to achieve routing (communication) between the VLANs This is usually part of a Voice QOS solution Advantages: VLAN offers very controllable bandwidth management on the LAN, restricts broadcast traffic, Disadvantages: more expensive switches (Smart or managed switches vs. ‘dumb’ switch), more technically skilled management required. LGCM VLAN 20 MFIM VLAN 20 Ext VLAN 20 Ext VLAN 20 IP Network Ext VLAN 20 Client PCs VLAN 1 Assigned range To Client Servers And fixed peripherals VLAN 1 Assigned Range To Client Routers Assigned range To iPECS VLAN IP Topology /24 VLAN /24 VLAN 1 Client Network MFIM + iPECS Devices Separate Broadcast Domains

6/7 Scenario 5 Separated Topology Usage: All iPECS Devices are on a Physically separate network! Sometimes employed at sites with an unstable or troublesome Office LAN. Advantages: Provides for absolute bandwidth management, An IP Address conflict with the Client Network is impossible. Similar advantages to VLAN but retains simple management. Disadvantages: more expensive – more switches needed, need a router (or multilayer switch) to connect with client network if connection is desired (e.g. for the Phontage client). LGCM MFIM Ext Ext IP Network Ext Client PCs Assigned range To Client Servers And fixed peripherals Assigned Range To Client Routers Assigned range To iPECS Separated IP Topology / /24 Client Network MFIM + iPECS Devices Separate Broadcast Domains

7/7 Scenario 7 iPECS Isolated Topology Usage: MFIM IP and all its devices may be on the same IP network. The major item defining the IP topology is the router in the middle of the It is not often employed (but sometimes installed to limit the effect of iPECS on a network) Advantages: Like a VLAN it segregates routable Networks and breaks up the broadcast domain (less network congestion) Disadvantages: Requires an additional Router be installed, LGCM MFIM Ext Ext IP Network Ext 702 Remote or Local-Remote mode Client PCs Assigned range To Client Servers And fixed peripherals Assigned Range To Edge Router iPECS Isolated Topology / /24 Client Network MFIM + iPECS Devices Separate Broadcast Domains Note: The iPECS part of the network is a flat topology, allowing devices outside the Router to connect as local- remote devices (which don’t use an IP channel). The LAN edge router may need a static route to direct voice traffic back to the iPECS router. ‘Internal’ Router