Monitoring snmp – Cisco ASA 5505 User Manual

Page 1806

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79-26

Cisco ASA 5500 Series Configuration Guide using the CLI

Chapter 79 Configuring SNMP

Monitoring SNMP

VLAN-only—SNMP uses logical statistics for ifInOctets and ifOutOctets.

The examples in

Table 79-6

show the differences in SNMP traffic statistics. Example 1 shows the

difference in physical and logical output statistics for the show interface command and the show traffic
command. Example 2 shows output statistics for a VLAN-only interface for the show interface
command and the show traffic command. The example shows that the statistics are close to the output
that appears for the show traffic command.

Monitoring SNMP

NMSs are the PCs or workstations that you set up to monitor SNMP events and manage devices, such as
the ASA.You can monitor the health of a device from an NMS by polling required information from the
SNMP agent that has been set up on the device. Predefined events from the SNMP agent to the NMS
generate syslog messages. This section includes the following topics:

SNMP Syslog Messaging, page 79-27

SNMP Monitoring, page 79-27

Table 79-6

SNMP Traffic Statistics for Physical and VLAN Interfaces

Example 1

Example 2

hostname# show interface GigabitEthernet3/2

interface GigabitEthernet3/2

description fullt-mgmt

nameif mgmt

security-level 10

ip address 10.7.14.201 255.255.255.0

management-only

hostname# show traffic

(Condensed output)

Physical Statistics

GigabitEthernet3/2:

received (in 121.760 secs)

36 packets 3428 bytes

0 pkts/sec 28 bytes/sec

Logical Statistics

mgmt:

received (in 117.780 secs)

36 packets 2780 bytes

0 pkts/sec 23 bytes/sec

The following examples show the SNMP output statistics for the
management interface and the physical interface. The ifInOctets
value is close to the physical statistics output that appears in the
show traffic command output but not to the logical statistics
output.

ifIndex of the mgmt interface:

IF_MIB::ifDescr.6 = Adaptive Security Appliance ‘mgmt’

interface

ifInOctets that corresponds to the physical interface statistics:

IF-MIB::ifInOctets.6 = Counter32:3246

hostname# show interface GigabitEthernet0/0.100

interface GigabitEthernet0/0.100

vlan 100

nameif inside

security-level 100

ip address 10.7.1.101 255.255.255.0 standby

10.7.1.102

hostname# show traffic

inside

received (in 9921.450 secs)

1977 packets 126528 bytes

0 pkts/sec 12 bytes/sec

transmitted (in 9921.450 secs)

1978 packets 126556 bytes

0 pkts/sec 12 bytes/sec

ifIndex of VLAN inside:

IF-MIB::ifDescr.9 = Adaptive Security Appliance

‘inside’ interface

IF-MIB::ifInOctets.9 = Counter32: 126318

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