Enterasys-networks Security Router X-PeditionTM Manual de usuario Pagina 218

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Interconnecting via Frame Relay Network
9-10 Configuring Frame Relay
Interconnecting via Frame Relay Network
The following typical application uses FR to link remote branches to the corporate network at the
central sites via a FR network, as shown in Figure 9-3.
Figure 9-3 Branch/Central Frame Relay Topology
New York
Minneapolis
Frame Relay
Houston
Chicago
Memphis
Frame Relay switch combines DLCIs from various
remote branch sites at 56 kbps into a single high
speed Frame Relay T1 interface with a large
number of DLCIs at the central sites.
Central Sites
Branch Sites
High speed FR link (clear channel T1/
E1 links, may be channelized or
fractional T3)
Many DLCIs per link
May use sub-interfaces to connect to
multiple subnets, each spanning
multiple remote sites
Link to many remote sites, may use FR
QoS templates to address different
remote sites
Medium speed FR links (32 - 128 kbps)
1-4 DLCIs linking one or more central
sites on different subnets
All DLCIs share characteristics (CIR,
Bc, Be)
•IP traffic requires traffic prioritization,
bandwidth allocation
Boston
Network
Tor on t o
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