Case Study

ReitCo is an organization with three offices: New York, Seattle, and Los Angeles, (see Figure 10-9). The majority of the company's employees are in the New York and Seattle offices, with the Los Angeles office hosting ReitCo's database and web servers. In an effort to cut their long distance costs between the Seattle and New York offices, ReitCo deployed VoFr cards on their Frame Relay access routers. The additional bandwidth necessary to carry the voice traffic is still significantly lower than the long distance charges, based on comparing the cost-per-Megabits (Frame Relay) usage and cost-per-minute (long distance).

Figure 10-9. ReitCo Case Study

ReitCo deployed Cisco 3640s at all three locations to support the data and voice requirements. Frame Relay Wan Interface Cards (WICs), VoFr WICs, and 10/100-Mbps Ethernet LAN cards were deployed for the Seattle and New York locations. The Los Angeles location deployed their Cisco 3640 with the Frame Relay WIC and 16-Mbps Token Ring LAN card.

ReitCo/Seattle is using the following DLCIs in their router:

• DLCI 685 New York

• Los Angeles

ReitCo/New York is using the following DLCIs in their router:

• DLCI 367 Seattle

• Los Angeles

ReitCo Los Angeles is using the following DLCIs in their router:

• DCLI 150 Seattle

• New York

For example, if data is to be sent across the Frame Relay WAN from Los Angeles to New York, the router identifies this traffic to the network service provider by using DLCI 100 in the header of the Frame Relay message. The New York router sees the traffic arriving from DLCI 425 because "425" is the DLCI New York has identified with Los Angeles.