Compressing Interfaces

You can compress interfaces by interface type and by the administrative status of the interface. Compressing interfaces removes them from the ifTable, the ifStackTable, and the ipAddrTable, which increases table retrieval performance. For example, if you want statistics kept only on IP interfaces, then you can compress all interfaces except IP; subsequently, only IP interfaces will appear in the ifTable, the ifStackTable, and the ipAddrTable.

To compress interfaces that have an administrative status of down, use the snmp-server interfaces compress-restriction command.

To compress interfaces according to type, use the snmp-server interfaces compress command. To see the list of interfaces that you can remove, use the CLI help:

If you enter the snmp-server interfaces compress command without keywords, the following interface types are removed from the interface tables:

• ip
• ppp
• ethernetSubinterface
• hdlc
• ipLoopback
• ipVirtual
• pppLinkInterface
• pppoeInterface
• slepInterface/ciscoHdlc

snmp-server interfaces compress

• Use to remove interface sublayers from the ifTable, the ifStackTable, and the ipAddrTable.
• Example

  host1(config)#snmp-server interfaces compress atmAal5

• Use the no version to add interface sublayers to the ifTable, the ifStackTable, and the ipAddrTable.
• See snmp-server interfaces compress.

snmp-server interfaces compress-restriction

• 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.

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