Specifications

7-9
Cisco AS5x00 Case Study for Basic IP Modem Services
11/24/1999
Section 7 Enabling Management Protocols: NTP, SNMP, and Syslog
Disabling the Logging of Access Interfaces
Step 2
Monitor SNMP input and output statistics. For example, display a real-time view of who is polling the
NAS for statistics and how often.
Excessive polling will:

Consume much of the CPU resources

Cause packets to be dropped

Crash the NAS
5300-NAS#show snmp
Chassis: 11811596
Contact: admin [e-mail]
Location: 5300-NAS-Maui
0 SNMP packets input
0 Bad SNMP version errors
0 Unknown community name
0 Illegal operation for community name supplied
0 Encoding errors
0 Number of requested variables
0 Number of altered variables
0 Get-request PDUs
0 Get-next PDUs
0 Set-request PDUs
0 SNMP packets output
0 Too big errors (Maximum packet size 1500)
0 No such name errors
0 Bad values errors
0 General errors
0 Response PDUs
0 Trap PDUs
SNMP logging: enabled
Logging to 172.22.66.18.162, 0/10, 0 sent, 0 dropped.
5300-NAS#
Task 4. Disabling the Logging of Access Interfaces
Limit the amount of output that is logged from the group-async interface and ISDN D channels.
Carefully choose the data sources for system management purposes. AAA accounting and the
modem-call record terse feature provides the best data set for analyzing ISDN remote node device
activity.
Link status up-down events and SNMP trap signals:

Occur regularly on access interfaces. Dialer interfaces going up and down is normal behavior and
does not indicate a problem.

Should not be logged or sent to a management server
The following configuration fragment disables logging on access interfaces:
!
interface Serial 0:23
no logging event link-status
no snmp trap link-status
!
interface Serial 1:23
no logging event link-status
no snmp trap link-status
!