Implications Of Sip And Spa Slot Mapping - Cisco ASR 1013 Hardware Installation Manual

Cisco ASR 1000 Series Routers Embedded Services Processors
2
The following figure displays an example of a packet flow in the Cisco ASR 1000 ESP 200.
Figure 26: Packet flow in the Cisco ASR 1000 ESP 200

Implications of SIP and SPA Slot Mapping

Interfaces and sessions that have an egress QoS have their schedules and queues present in the QFP-3rd-Gen
ASIC that services the particular slot. Since there is a limitation of 29000 schedules and 116000 queues per
QFP-3rd-Gen ASIC, multiple QFP-3rd-Gen ASICs should be targeted by placing the SIP and SPA in the
correct order, in order to achieve full system scalability for schedules and queues.
For example, A 5xGE SPA supports more than 32000 point-to-point protocol (PPP) sessions depending on
the ESP. However, if QoS is applied to these sessions, the QFP-3rd-Gen ASIC that supports the SIP and SPA
slot can support only 29000 schedules, and these sessions share the 116000 queue limit. To support PPP
Cisco ASR 1000-ESP200 and Third Generation Cisco QFP
Egress queueing for 4
interfaces handled by
QFP-3rd-Gen 2
Cisco ASR 1000 Series Router Hardware Installation Guide
Egress queueing for
interfaces handled by
QFP-3rd-Gen 0
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