Controlling Interface Numbering - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - SYSTEM BASICS CONFIGURATION GUIDE 2010-10-04 Configuration Manual

snmp-server interfaces compress-restriction
snmp-server interfaces rfc1213
Copyright © 2010, Juniper Networks, Inc.
From ifTables
From ifStackTables
Armed Interface Numbering Mode: Sparse ifIndex
Interface Description Setting: Proprietary
Use the no version to add interface sublayers to the interface tables.
See snmp-server interfaces compress.
Use to exclude interfaces from the ifTable, the ifStackTable, and the ipAddrTable if
the administrative status of the interface is down.
Example
host1(config)#snmp-server interfaces compress-restriction ifadminstatusdown
Use the no version to remove the restriction and allow interfaces with an administrative
status of down in the ifTable, the ifStackTable, and the ipAddrTable.
See snmp-server interfaces compress-restriction.

Controlling Interface Numbering

Each interface in the ifTable is assigned an ifIndex number. RFC 1213 required that ifIndexes
use contiguous integers and that the ifIndex be less than the value of the total number
of interfaces (ifNumber). More recent RFCs—1573, 2232, and 2863—removed these
restrictions to accommodate interface sublayers. The E Series router implementation of
SNMP derives index numbers in 32-bit values that are unique on a given router. This
numbering scheme can result in large gaps in the ifIndex.
Legacy network management software that was designed to work with RFC 1213
implementations expects contiguous integers and can fail when the software encounters
large gaps in the ifIndex.
By default, the router uses a numbering scheme based on RFC 2863. For compatibility
with RFC 1213, you can set up the router to use contiguous numbers and to limit the values
of the ifIndex and the ifNumber.
Use to set up the interface numbering method in the IfTable to use contiguous integers,
which provides compatibility with versions of SNMP that are based on RFC 1213.
The maxIfIndex option sets the maximum value of the ifIndex field that the system will
allocate.
The maxIfNumber option sets the maximum number of interfaces allowed in the
interface tables.
CAUTION: Reducing the value of the maxIfIndex or maxIfNumber causes
the router to automatically reboot to factory default settings.
: Atm
: Ds1
Chapter 4: Configuring SNMP
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