Cisco Systems OL-7396-01 CTT Row Allocations and Defaults

9-11
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter9 Configuring Resource Management
Configuring Global Resource Management
PVC Connection Traffic Rows
The CTT in a permanent virtual channel (PVC) setup requires storing PVC traffic values in a CTT data
structure. Rows used for PVCs are called stable rows, and contain traffic parameters.
SVC Connection Traffic Rows
The CTT in a switched virtual channel (SVC) setup provides a row identifier that Simple Network
Management Protocol (SNMP) or the user interface can use to read or display SVC traffic parameters.
A CTT row index is stored in the connection-leg data structure for each flow of the connection.
Note Rows cannot be deleted while in use by a connection.
CTT Row Allocations and Defaults
To make CTT management software more efficient, the CTT row-index space is split into rows allocated
as a result of signalling and rows allocated from the command-line interface (CLI) and SNMP. Table 9-5
describes the row-index range for both.
Table 9 -6 describes the well-known, predefined ATM CTT rows.
Table9-5 CTT Row-Index Allocation
Allocated by Row-index range
ATOMMIB Traffic Descriptor Table or CLI
connection-traffic-table-row creation
1 through 1,073,741,823
Signalling VxL creation 1,073,741,824 through 2,147,483,647
Table9-6 Default ATM Connection Traffic Table Rows
CTT Row
Index
Service
Category
Peak-Cell-Rate
(clp01)
Sustained-
Cell-Rate
(clp01) Tolerance Use
1 UBR 7,113,539 — None Default PVP/PVC row
index
2 CBR 424 kbps — None CBR tunnel well-known
(WK) VCs
3 VBR-RT 424 kbps 424 kbps 50 Physical
interface/VBR-RT WK
VCs
4 VBR-NRT 424 kbps 424 kbps 50 VBR-NRT tunnel WK VCs
5 ABR 424 kbps — None —
6 UBR 424 kbps — None UBR tunnel WK VCs