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Configuring Frame Relay
Concentrating incoming calls onto Frame Relay
MAX 6000/3000 Network Configuration Guide Preliminary January 4, 2001 5-19
Concentrating incoming calls onto Frame Relay
A common way to concentrate incoming connections onto a Frame Relay link is by making
use of OSI layer 3 (IP routing). For this purpose, the MAX requires ordinary profiles for the
callers, and a DLCI logical interface that specifies a destination IP router. When clients dial in
to reach the destination router, the MAX consults its routing table to forward the packets onto
Frame Relay. In this type of configuration, the MAX acts as a Frame Relay gateway.
For incoming PPP connections, Frame Relay Direct is another way to concentrate the calls
onto a Frame Relay link. Frame Relay Direct aggregates multiple PPP connections and
forwards them as a combined data stream solely on the basis of the FR-Direct specifications.
The assumption is that an upstream device will examine the packets and route them
appropriately.
Note: A Frame Relay Direct connection is not a full-duplex tunnel between a PPP dial-in and
a far-end device. Although the MAX does not use the router to forward packets onto the Frame
Relay link, it must use the router to send packets received across Frame Relay back to the
appropriate PPP caller. For this reason, Frame Relay Direct connections must enable IP
routing.
Setting up a Frame Relay gateway
To act as a Frame Relay gateway, the Frame Relay DLCI profile must specify a destination
router. Incoming connections are routed in the usual way, and all of the usual options apply.
Administrators can choose to create static routes, enable or disable RIP, and so forth. For
details, see Chapter 9, “Configuring IP Routing.”
For background information about specifying a DLCI interface, see “Configuring a DLCI
logical interface” on page 5-13.
Routing parameters in the DLCI profile
In addition to the Frame Relay settings described in “Overview of DLCI interface settings” on
page 5-13, the following Connection parameters are relevant to a gateway DLCI profile:
Ethernet
Connections
Connection profile
Route IP=Yes
IP options
LAN Adrs=0.0.0.0/0
Parameter Specifies
Route IP Enables/disables IP routing for this connection. It is enabled by
default, and must be enabled for a Frame Relay gateway.
LAN Adrs Destination IP address, which lies at the end of a PVC whose first
hop is known by the specified DLCI.