Cisco bpx-8620 ユーザーガイド

The unspecified bit rate (UBR) connection service is similar to the ABR connection service for bursty
data. However, UBR traffic is delivered only when there is spare bandwidth in the network. This is
enforced by setting the CLP bit on UBR traffic when it enters a port.

Therefore, traffic is served out to the network only when no other traffic is waiting to be served first.
The UBR traffic does not affect the trunk loading calculations performed by the switch software.

The parameters for a UBR connection are shown in Figure 21-11 in the sequence in which they occur
during the execution of the addcon command.

The UBR policing definitions are summarized in Table 21-10.

ABRFST

PCR(0+1)
%Util
MCR
CDVT(0+1)
FBTC (Frame based traffic control - AAL5, enable/disable)
FCES (Flow Control External Segment, enable/disable)

Default Extended Parameters (enable/disable)

    At present, FCES is not available for ABR with ForeSight

    For policing prompt:
    1 = VBR.1
    2 = VBR.2
    3 = VBR.3 
    4 = PCR policing only
    5 = policing off

 Note:  Bandwidth allocation 
    = (MCR)x(%Util)

10227

Enabled

Default values used
for: SCR, MBS, etc.

Disabled
(Configure
following
parameters)

SCR
MBS
Policing (1, 2, 3, 4, or 5)
VC QDepth
CLP Hi
CLP Lo/EPD
EFCI
ICR
ADTF (same as ICR TO)
Trm (same as Min. Adjust)
RIF (same as Rate up)
RDF (same as Rate down)

1

2

2

1

Trunk cell routing
 restrict (Y/N) [Y]