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Valid Values: See “Committed Burst (Bc) Size” 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 “Excess Burst (Be) Size” 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, configure 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-speed command
to configure 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 configurations 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 figure 39-4. The size you
configure 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 configured
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 configured frame size and is protocol
dependent. The following table shows how many bytes to subtract from the
configured 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
Configuring Frame Relay Interfaces
Chapter 31. Configuring and Monitoring Frame Relay Interfaces 429
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