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Table 1 Cisco IOS Support and Orderability Rules
Note: OC-3 ATM network modules not supported in IP only and IP/IPX/AT/DEC Cisco IOS feature sets. ATM isalso supported in the service provider (–p–) image.
Table 2 ATM Service Category Definitions
Product
IOS Software
Version Required
IOS Feature
Sets
Required Minimum DRAM Memory
Maximum
Supporte
d
Cisco 2600 Series
including 2610/11, 2620/21,
2650/51,2610/11XM,2620/21XM,
and 2650/51XM
Not supported N/A N/A N/A
Cisco 2691
12.2(13)T Plus Same as 2691 12.2(13)T Cisco IOS
Plus feature sets DRAM minimum
memory requirements
1
Cisco 3620
12.0(3)T Plus Same as 12.0(3)T Cisco IOS Plus
feature sets DRAM minimum
memory requirements
1
Cisco 3640
12.0(3)T Plus Same as 12.0(3)T Cisco IOS Plus
feature sets DRAM minimum
memory requirements
1
Cisco 3660
12.0(5)XK and
12.0(5)T
Plus Same as 12.0(5)T Cisco IOS Plus
feature sets DRAM minimum
memory requirements
1
Cisco 3725
12.2(13)T Plus Same as 3725 12.2(13)T Cisco IOS
Plus feature sets DRAM minimum
memory requirements
1
Cisco 3745 (Enhanced
Performance Network Module)
12.2(13)T Plus Same as 3745 12.2(13)T Cisco IOS
Plus feature sets DRAM minimum
memory requirements
2
ATM Service Categories Typical Use
Unspecified Bit Rate (UBR)
Best-effort service intended for nonreal-time bursty applications that do not require
a guarantee of traffic characteristics such as bandwidth, cell delay, and cell delay
variation
UBR+
Provides a guaranteed frame rate (GFR) service with single leaky bucket algorithm.
Provides the ability to reserve UBR bandwidth minimum, or specify bandwidth
maximum. Similar to VBR in that it increases the minimum cell rate (MCR) when cell
rate falls below the MCR.
Variable Bit Rate (VBR-rt and
VBR-nrt)
Intended for applications that have bursty traffic patterns but require a guarantee of
some traffic parameters. A peak cell rate (PCR), sustained cell rate (SCR), and
Maximum Burst size (MBS) can specify traffic parameters.