Nortel CG030601 - Manual
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Table of Contents:
- Page 2 – Configuration Guide; Contivity Secure IP Services Gateway; Frame Relay on Contivity Secure IP Services Gateway; Management protocols
- Page 3 – Address resolution for PVCs; committed; Committed burst rate and excess burst rate
- Page 4 – Congestion control
- Page 5 – Configuring Frame; Relay; on CES; To enable Frame Relay through the CLI
- Page 7 – Selecting a management type; DLCMI None; provides no management interface between the router and the; Rev 1 LMI
- Page 8 – provides user-side management services as specified in Annex-D; CCITT Annex A; provides user-side management services as specified by the; Configuring management type using CLI; ANSI; Monitoring the connection; Polling interval; The polling interval; Configuring polling interval using CLI; Full enquiry interval; The full enquiry interval
- Page 9 – Using CLI to configure; Using Web GUI to configure
- Page 10 – Configuring Frame Relay virtual circuits; Follow these steps to configure a frame relay virtual circuit:
- Page 12 – Using the Web interface to configure
Configuration Guide
Contivity Secure IP Services Gateway
Frame Relay on Contivity Secure IP Services Gateway
CG030601
2.00 July 2003
Page: 1 of 14
Introduction to Frame Relay
Frame relay
is a high-speed, packet-switching WAN protocol that connects
geographically dispersed LANs. A public network provider usually offers frame relay.
However, private organizations can acquire and manage their own frame relay networks
as well.
Frame relay is a connection-oriented protocol. This means it relies on end-to-end paths
between devices connected across the network. It implements these connections using
permanent virtual circuits (PVCs).
Frame relay assumes that networks use transmission lines with low error rates, such as
digital transmission media. Therefore, frame relay provides only basic error detection
with no error recovery. This minimizes the processing required for each packet, allowing
frame relay networks to operate at high speeds with few network delays.
Because frame relay performs only basic error checking, end stations running upper-layer
protocols such as the Internet Protocol (IP) are responsible for resending packets that did
not transmit correctly the first time.
Permanent virtual circuits
A permanent virtual circuit
(PVC) is a dedicated logical path that connects two devices
over a network. When configured, a PVC is always available to the connected devices; a
PVC does not require setup before data can travel across the network, nor does it need to
be disconnected after data has passed. Because many PVCs can coexist for one physical
line, devices can share the bandwidth of the transmission line.
Frame Relay packets
The structure of a frame relay packet is shown in the following figure
.
Figure 1 Frame Relay packet
The packet’s header field includes the following components:
Data link connection identifier (DLCI)
The DLCI is the virtual circuit identification number. The frame relay network uses the
DLCI to direct basic data flow. You configure the DLCI for PVCs.
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Summary
Configuration Guide Contivity Secure IP Services Gateway Frame Relay on Contivity Secure IP Services Gateway CG030601 2.00 July 2003 Page: 2 of 14 Command/response bit (C/R) ITU-T (formerly CCITT) standards do not use this bit. Forward explicit congestion notification (FECN) and backward explicit co...
Configuration Guide Contivity Secure IP Services Gateway Frame Relay on Contivity Secure IP Services Gateway CG030601 2.00 July 2003 Page: 3 of 14 Address resolution for PVCs Address resolution for PVCs maps a remote network address such as an IP address to a local DLCI number. IP uses the Address R...
Configuration Guide Contivity Secure IP Services Gateway Frame Relay on Contivity Secure IP Services Gateway CG030601 2.00 July 2003 Page: 4 of 14 Congestion control Network congestion can degrade network performance. Congestion occurs when a node receives more frames than it can process, or sends m...
