
Frame Relay Overview
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For more information about these parameters, refer to Configuring WAN Line
Services.
Calculating the MTU Size for Frame Relay Connections
The maximum transmission unit (MTU) value is the largest packet size the router
will transmit across a connection. The MTU is configured as part of the WAN line
parameters and its default value for frame relay is 1600.
If your Nortel Networks router communicates across a frame relay line, you may
need to adjust the MTU value because as you add headers to the frame relay
packet, such as those for compression and encryption, the router reduces the space
for layer 3 data, such as IP or IPX datagrams.
Table 1-8. Synchronous Line Parameters for Frame Relay
Parameter Value
BofL Disable
Promiscuous Enable
Service Transparent
WAN Protocol Frame Relay
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