Interconnecting Via Frame Relay Network - Enterasys Security Router X-PeditionTM User Manual

Interconnecting via Frame Relay Network

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
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9-10 Configuring Frame Relay
Figure 9-3
Minneapolis
Houston
Memphis
Toronto
Boston
Branch 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
Figure 9-3.
Branch/Central Frame Relay Topology
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.
Frame Relay
Network
• 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
New York
Chicago
Central Sites