Cisco 10000 - Manual (Page 76)

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Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 2 Scalability and Performance
Configuring the Cisco 10000 Series Router for High Scalability
Configuring atm pxf queuing
The Cisco 10000 series router supports two ATM traffic classes when you configure atm pxf queuing:
unshaped UBR and VBR-nrt. When you specify an output PCR for an unshaped UBR class, the
Cisco 10000 series router accepts the PCR. However, the router does not use the PCR value and it does
not notify you of this omission.
For information about configuring the traffic classes, see the “Configuring no atm pxf queuing” section
on page 2-15 .
Note Before you configure VCs on an interface, configure the atm pxf queuing mode for the port (atm pxf
queuing or no atm pxf queuing). After you configure the mode, then configure the VCs. Do not change
the mode while VCs are configured on the interface. If you need to change the mode, delete the VCs first
and then change the mode. Changing the mode while VCs are configured can produce undesired results.
Table 2-8 lists the number of active VCs the ATM line cards support in atm pxf queuing mode for Cisco
IOS Release 12.3(7)XI2 or later releases.
You can configure the maximum number of VCs across the ports in any fashion, provided that you do
not exceed the per-port maximum.
Although the maximum number of VBR, CBR, and shaped UBR VCs per E3/DS3 and OC-3 ATM line
card is 28,672 VCs, the router supports a maximum of 22,204 VBR, CBR, and shaped UBR VCs per line
card that you can place within virtual path (VP) tunnels. If you attempt to bring up more than 22,204
VCs in a configuration that includes VP tunnels and VCs (hierarchical traffic shaping configuration), the
VCs might not assign traffic correctly or the VCs might not come up at all. Be sure to limit the number
of configured VBR, CBR, and shaped UBR VCs on an ATM card to less than 22,204 VCs if you place
the VCs in VP tunnels.
For the OC-12 ATM line card, the router supports 16,384 VCs in VP tunnels.
Table 2-8 Active VCs on ATM Line Cards
Line Card Maximum VCs per Port Maximum VCs per Module No. VBR, CBR, Shaped UBR VCs
E3/DS3 4,096 32,768 1
1. For 32,768 VCs per module, 4096 of them must be unshaped UBR VCs.
28,672 2
2. For 28,672 VBR, CBR, and shaped UBR VCs, no VCs can be in shaped VP tunnels. If VCs are in shaped VPs, the number of VBR, CBR, and shaped
UBR VCs is 22,204.
OC-3 8,191 32,764 3
3. For 32,764 VCs per module, 4096 of them must be unshaped UBR VCs.
28,672 4
4. For 28,672 VBR, CBR, and shaped UBR VCs, no VCs can be in shaped VP tunnels. If VCs are in shaped VPs, the number of VBR, CBR, and shaped
UBR VCs is 22,204.
OC-12 16,384 (previously 14,436) 16,384 16,384