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Frame Relay
Sunday, 18 May 2008 14:05
FECN (forward explicit congestion notification) is a header bit transmitted by the source (sending) terminal requesting that the destination (receiving) terminal slow down its requests for data.
BECN (backward explicit congestion notification) is a header bit transmitted by the destination terminal requesting that the source terminal send data more slowly. FECN and BECN are intended to minimize the possibility that packets will be discarded (and thus have to be resent) when more packets arrive than can be handled.
Show/Debug commands
Show frame-relay PVC
Show frame-relay map
Show frame-relay traffic
Debug frame-relay LMI
Main Commands
Full Mesh with 1 Subnet
Below shows the main command for setting frame relay on a switch.
Please note that the LMI is set by default to auto-sense.
If you need to change the LMI setting see the ICND book page 416.
#(config)Interface serial0
#(config-if)Encapsulation frame-relay
#(config-if)IP address [ip] [Subnet]
Full Mesh with IPs
Static frame-relay command
This stops the inverse arp on the interface and uses a static mapping. This doesn’t hardly get used though.
#(config)Interface serial 0
#(config)No frame-relay inverse arp
#(config)Frame-relay map ip [IP address] [DLCI] broadcast