Chapter1 Cisco SDM Express
Supplementary Help
1-34
Cisco SDM Express
OL-7141-04
The configuration that will be delivered to the router to enable CiscoExpress
Forwarding is as follows:
ip cef
Set Scheduler Interval
Cisco SDM Express configures the scheduler interval on the router whenever
possible. When a router is fast-switching a large number of packets, it is possible
for the router to spend so much time responding to interrupts from the network
interfaces that no other work gets done. Some very fast packet floods can cause
this condition, which may stop administrative access to the router, a very
dangerous condition when the device is under attack. Tuning the sch eduler
interval ensures that management access to the router is always available by
causing the router to run system processes after the specified time interval even
when CPU usage is at 100%.
The configuration that will be delivered to the router to tune the scheduler interval
is as follows:
scheduler interval 500
Set Scheduler Allocate
On routers that do not support the command scheduler interval,
CiscoSDM Express configures the scheduler allocate command whenever
possible. When a router is fast-switching a large number of packets, it is possible
for the router to spend so much time responding to interrupts from the network
interfaces that no other work gets done. Some very fast packet floods can cause
this condition. It may stop administrative access to the router, which is very
dangerous when the device is under attack. The scheduler allocate command
guarantees a percentage of the router CPU processes for activities other than
network switching, such as management processes.
The configuration that will be delivered to the router to set the scheduler allocate
percentage is as follows:
scheduler allocate 4000 1000