The configuration of the network devices for the set of experiments at ERG are shown in the figure below. Presently, the ERG router (Cisco 4000 series) has one 100 Base TX interface and two 10 Base T (also used as 10 Base 2) interfaces. The Cisco 1900 series switch has 24 10Base TX interfaces, one 10 Base 2 interface, and two 100 Base TX interfaces. The 3Com Office Connect Hub has 8 100 Base TX interfaces. The Ultra 1 workstation has of a 100 Mbps (100 Base TX) interface card. A 3Com 100/10 Mbps switchable interface card is been used in the Delivery PCs.
The Experimental Network at ERG for the JTAP Project
The 100 Base TX interface of the router was connected to one of the 100Base TX interfaces of the Cisco 1900 series switch to form the ERG experimental network for the JTAP project.
One 10 Mbps interface is connected to the campus network (139.133.210.0) for external communication onwards to a router attached via the campus FDDI backbone. The other spare interface is reserved for a 10 Mbps connection from the computer centre to directly communicate with Video Clip Server (VCS).
The router uses RIP for unicast routing and PIM for multicast traffic. The router is also configured to support a virtual 100 Mbps interface. This interface was used as an end point of the MBone tunnel (through the 10 Mbps 139.133.210.0 network) connected to the Internet MBone multicast network.
A few ports of the same switch have been configured as a separate VLAN (virtual LAN - 1) to serve a part of the existing ERG network. This traffc does not form a part of the measurements or impact the measured data.
The 100 Base TX interface of the router has also been configured to support a secondary interface for the ERG network. This configuration allows the ERG JTAP experimental network to efficiently share resources conencted via the ERG network. To facilitate this, the Cisco 1900 switch has been configured to sharr one of the 100 Base TX ports between two VLANs.
Port B of the VLAN 2 (ERG JTAP network) has been connected to a 100 Base TX hub to provide connectivity to another 7 workstations and/or delivery PCs.
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