Specifications

14-6
System Management Software Configuration Guide for Cisco IE 2000U and Connected Grid Switches
Chapter 14 Configuring SNMP
Information About SNMP
SNMP ifIndex MIB Object Values
In an NMS, the IF-MIB generates and assigns an interface index (ifIndex) object value that is a unique
number greater than zero to identify a physical or a logical interface. When the switch reboots or the
switch software is upgraded, the switch uses this same value for the interface. For example, if the switch
assigns a port 2 an ifIndex value of 10003, this value is the same after the switch reboots.
The switch uses one of the values in Table 14-3 to assign an ifIndex value to an interface:
Note The switch might not use sequential values within a range.
MIB Data Collection and Transfer
To configure periodic transfer of MIB data from a device to a specified NMS, you group data from
multiple MIBs into a list and configure a polling interval. All MIB objects in the list are polled at the
specified interval, and the data is transferred to the specified NMS at a configured transfer interval. The
periodic data collection and transfer mechanism is referred to as the bulk-statistics feature.
To configure bulk statistics, you use a bulk-statistics object list to specify the SNMP object types to be
monitored and a bulk-statistics schema to specify the instances of the objects to be collected. You can
specify MIBs, MIB tables, MIB objects, and object indices by using a series of object identifiers (OIDs).
• A bulk-statistics object list is a user-specified set of MIB objects that share the same MIB index
identified by a user-specified name.
• A bulk-statistics schema is identified by a user-specified name and includes the name of the object
list, the instance to be retrieved for objects in the object list, and the polling interval.
After you configure the data to be collected, a single virtual bulk-statistics file is created with all the
collected data. You can specify how the file is transferred to the NMS (FTP, RCP, or TFTP), how often
the file is transferred (the default is 30 minutes), and a secondary destination if the primary NMS is not
available. The transfer-interval time is also the collection-interval time. After the collection interval
ends, the bulk-statistics file is frozen, and a new local bulk-statistics file is created to store new data. The
frozen file is transferred to the specified destination and then deleted (unless you configure the device
to keep the file in memory for a specified time period). You can configure the switch to send an SNMP
notification to the NMS if a transfer is not successful and to enter a syslog message on the local device.
Table 14-3 ifIndex Values
Interface Type ifIndex Range
SVI
1
1. SVI = switch virtual interface
1–4999
EtherChannel 5000–5012
Loopback 5013–5077
Tunnel 5078–5142
Physical (such as Gigabit Ethernet or SFP
2
-module interfaces)
2. SFP = small form-factor pluggable
10000–14500
Null 14501