User`s guide

Chapter 1 Cisco SDM Express
Supplementary Help
1-34
Cisco SDM Express 2.4 User’s Guide
OL-7141-05
service timestamps debug datetime localtime show-timezone msec
service timestamps log datetime localtime show-timeout msec
service sequence-numbers
Enable IP CEF
Cisco SDM Express enables Cisco Express Forwarding or Distributed Cisco
Express Forwarding whenever possible. Because there is no need to build cache
entries when traffic starts arriving at new destinations, Cisco Express Forwarding
behaves more predictably than other modes when presented with large volumes
of traffic addressed to many destinations. Routes configured for Cisco Express
Forwarding perform better under SYN attacks than routers using the traditional
cache.
The configuration that will be delivered to the router to enable Cisco Express
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 scheduler
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,
Cisco SDM 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