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17-1
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
17
Cisco 10000 Series Router PXF Stall Monitor
In Cisco IOS Release 12.2(33)XNE, the Cisco 10000 series routers include a mechanism that verifies
whether Parallel Express Forwarding (PXF) can forward packet traffic.
A PXF forwards traffic and a fault in the PXF can cause the traffic to silently come to a halt. Any fault
in the PXF can cause the traffic to halt and cause the router to drop packets without updating the error
counters. These faults in the PXF can also affect the devices that are connected to the router. Manual
intervention is required to recover from silent PXF failures.
The Cisco 10000 Series Router PXF Stall Monitor feature monitors PXF forwarding by getting
information about forwarding traffic and any stalls on the PXF-route processor (RP), PXF-line card
(LC), and LC-PXF paths.
This chapter includes the following topics:
• Feature History of Cisco 10000 Series Router PXF Stall Monitor, page 17-1
• Information about Cisco 10000 Series Router PXF Stall Monitor, page 17-1
• Restrictions for Cisco 10000 Series Router PXF Stall Monitor, page 17-3
• Configuring Cisco 10000 Series Router PXF Stall Monitor, page 17-4
• Configuration Example of Cisco 10000 Series Router PXF Stall Monitor, page 17-5
Feature History of Cisco 10000 Series Router PXF Stall Monitor
Information about Cisco 10000 Series Router PXF Stall Monitor
The Cisco 10000 Series Router PXF Stall Monitor feature periodically verifies the basic forwarding
capability of the PXF. The PXF stall monitor (PSM) is present on both active and standby PREs but
operates on only the active PRE. The PSM in a standby PRE starts detection as soon as the PRE becomes
active. An user can turn the PSM on or off without disrupting the working of the router.
Prior to Cisco IOS Release 12.2(33)XNE, Cisco 10000 series routers could detect the following stall
conditions on the packet data path.
Cisco IOS Release Description Required PRE
12.2(33)XNE This feature was introduced in Cisco 10000 series routers. PRE3 and PRE4