Lucent Technologies 6000 User Manual
5-2
Preliminary January 4, 2001
MAX 6000/3000 Network Configuration Guide
Configuring Frame Relay
Introduction
Introduction
configured with a User-to-Network (UNI) interface to Frame Relay, the MAX acts as the user
side (UNI-DTE) communicating with the network side (UNI-DCE) of a switch.
side (UNI-DTE) communicating with the network side (UNI-DCE) of a switch.
The network-side device connects the CPE device to a Frame Relay network. For example, the
MAX labeled MAX-01 in Figure 5-1 receives Frame Relay encapsulated frames from a CPE
and forwards them on to another Frame Relay switch. When it is configured with a UNI-DCE
interface to Frame Relay, the MAX acts as the network side (UNI-DCE) communicating with
the user side (UNI-DTE) of a Frame Relay device.
MAX labeled MAX-01 in Figure 5-1 receives Frame Relay encapsulated frames from a CPE
and forwards them on to another Frame Relay switch. When it is configured with a UNI-DCE
interface to Frame Relay, the MAX acts as the network side (UNI-DCE) communicating with
the user side (UNI-DTE) of a Frame Relay device.
Figure 5-1. Frame Relay network
A Frame Relay switch is another kind of network-side device, which switches frames from one
interface to another and exchanges status information with its peer switch. For example, the
MAX labeled MAX-01 in Figure 5-1 receives frames from its peer switch and switches them
to its other Frame Relay interface. When it is configured with a Network-to-Network (NNI)
interface to Frame Relay, the MAX acts as a Frame Relay switch. Switch-to-switch
communication includes both user side (NNI-DTE) and network side (NNI-DCE) functions.
interface to another and exchanges status information with its peer switch. For example, the
MAX labeled MAX-01 in Figure 5-1 receives frames from its peer switch and switches them
to its other Frame Relay interface. When it is configured with a Network-to-Network (NNI)
interface to Frame Relay, the MAX acts as a Frame Relay switch. Switch-to-switch
communication includes both user side (NNI-DTE) and network side (NNI-DCE) functions.
Frame Relay link management
Frame Relay link management enables administrators to retrieve information about the status
of the Frame Relay interface via special management frames with a unique Data Link
Connection Identifier (DLCI) address. (DLCI 0 is the default for link management frames.)
Link management frames are used to monitor the interface and provide information about
DLCI status.
of the Frame Relay interface via special management frames with a unique Data Link
Connection Identifier (DLCI) address. (DLCI 0 is the default for link management frames.)
Link management frames are used to monitor the interface and provide information about
DLCI status.
On a UNI interface to Frame Relay, link management procedures occur in one direction. The
UNI-DTE device requests information and the UNI-DCE device provides it.
UNI-DTE device requests information and the UNI-DCE device provides it.
On an NNI interface, link management procedures are bidirectional. Switches perform both the
NNI-DTE and NNI-DCE link management functions, since both sides of the connection
request information from their peer switches.
NNI-DTE and NNI-DCE link management functions, since both sides of the connection
request information from their peer switches.
Using the MAX as a Frame Relay concentrator
As a Frame Relay concentrator, the MAX forwards many lower-speed PPP connections onto
one or more high-speed Frame Relay interfaces, as shown in Figure 5-2:
one or more high-speed Frame Relay interfaces, as shown in Figure 5-2:
DTE DCE
NNI NNI
NNI NNI
DCE DTE
PPP callers
PPP callers
Private LAN
MAX-02
MAX-01
CPE
router
router