IBM SC30-3681-08 Valid Values See ªCommitted Burst Bc Sizeº on, Clocking external or internal

Con®guring Frame Relay Interfaces

Valid Values: See ªCommitted Burst (Bc) Sizeº on page 397

Default Value: 64 000

be Sets the default value of be to the value provided by a Frame Relay network provider.

Valid Values: See ªExcess Burst (Be) Sizeº on page 397

Default Value: 0

Example:

FR 6 config> set cir-default

Default Committed Information Rate (CIR) in bps [64000]? 48000

Default Committed Burst Size (Bc) in bits [64000]? 40000

Default Excess Burst Size (Be) in bits [0]? 52000

clocking [external or internal]
	To connect to a modem or DSU, con®gure clocking as external. To connect
	directly to another DTE device, use a DCE cable and set the clocking to
	internal. For internal clocking, you must enter the set line-speedcommand
	to con®gure a clock speed between 2400 and 2048000 bps.If you want to
	use a line speed greater than 2048000, you can only do this on:
	v interface 1.
	v port 1 of a 4-port WAN concentration adapter.
	v ports 1 and 5 of an 8-port WAN concentration adapter.
	The other WAN ports must be clocked at 64 Kbps or less.
	For external clocking the maximum line speed is 6 312 000 bps.
encoding [NRZ or NRZI]
	Sets the HDLC transmission encoding scheme as NRZ (non-return to zero)
	or NRZI (non-return to zero inverted). Most con®gurations use NRZ, which
	is the default.
frame-size #
	Sets the maximum size of the network layer portion of the frames
	transmitted and received on the interface. This maximum size includes the
	2-byte DLCI address and the user data shown in ®gure 39-4. The size you
	con®gure must be consistent with the maximum frame size supported by
	the Frame Relay switch and by the other FR DTEs in the Frame Relay
	network. Values are 262 to 8190. The default is 2048. Since the con®gured
	frame size includes the DLCI address and the FR RFC 1490 multi-protocol
	encapsulation header, the maximum protocol packet size that can be
	transmitted is less than the con®gured frame size and is protocol
	dependent. The following table shows how many bytes to subtract from the
	con®gured frame size to determine the maximum protocol packet size that
	can be transmitted and received on the interface.
IP		4 bytes
IPX		10 bytes
Appletalk Phase 2		10 bytes
DECnet Phase IV (DNA IV)		12 bytes
Banyan Vines		10 bytes
OSI		10 bytes
Bridging		10 bytes

Chapter 31. Con®guring and Monitoring Frame Relay Interfaces 429