6-35
Configuring the Data Link Layer Protocol for E1, T1, and Serial Interfaces
Configuring the Logical Interface
Set the CIR
You can configure the CIR for the Frame Relay link using the frame-relay bc
command. As explained earlier, the CIR is the bandwidth that your Frame
Relay service provider guarantees your company.
The CIR is calculated from the B
c
, which is the maximum number of bits that
the Frame Relay carrier guarantees to forward during a certain interval of time
(T). The CIR is equal to B
c
/T.
You should set a B
c
for each Frame Relay subinterface to ensure that the PVC
does not exceed its CIR. Some Frame Relay service providers may charge your
company extra if your company consistently transmits over its CIR.
The industry standard is to calculate the time interval as 1 second. As a result,
the B
c
is essentially the CIR. To set the CIR, enter the following command
from the Frame Relay subinterface configuration mode context:
Syntax: frame-relay bc <committed burst value>
Replace <committed burst value> with your CIR expressed in bits. You can
set a B
c
between 0 and 4,294,967,294 bps.
For example, you might enter:
ProCurve(config-fr 1.1)# frame-relay bc 256000
Set the EIR
When your company negotiated a SLA, the terms of that agreement probably
allowed for a burst rate on the Frame Relay connection. This burst rate is
called the Excess Information Rate (EIR), which defines the maximum
amount of traffic your company is allowed to send over its CIR.
The B
e
sets the maximum number of bits that the router can transmit during
T. Just as B
c
is equal to the CIR, B
e
is equal to the EIR. B
e
determines the rate
at which the ProCurve Secure Router can burst data above the CIR when there
is no congestion on the Frame Relay network.
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