CENTILLION-DOT3-EXTENSIONS-MIB

Description: Provides Ethernet (IEEE 802.3) interface extensions for Nortel Centillion switch module management.

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CENTILLION-DOT3-EXTENSIONS-MIB is a vendor-specific MIB from Nortel (originally Bay Networks) Centillion ATM/LAN switches, extending IEEE 802.3 (Ethernet) interface management beyond what the standard EtherLike-MIB provides. It exposes a table (cnDot3ExtnTable/cnDot3ExtnEntry) of per-interface Ethernet extension attributes, including administrative and operational speed (cnDot3ExtnIfAdminSpeed/cnDot3ExtnIfOperSpeed) and administrative/operational connection type (cnDot3ExtnIfAdminConnectionType/cnDot3ExtnIfOperConnectionType). Its monitoring value is centered on hardware/interface status: comparing admin versus operational speed and connection type reveals auto-negotiation mismatches or a port that has fallen back to a lower speed or different duplex/connection mode than configured. As an extension module, it clearly depends on the standard IETF EtherLike-MIB and IF-MIB for base interface indexing (ifIndex) and Ethernet statistics. It is deployed on Nortel/Bay Networks Centillion switch modules in legacy enterprise LAN/ATM edge environments. Engineers can download the CENTILLION-DOT3-EXTENSIONS-MIB file directly to load it into their MIB browser.

An administrator would poll cnDot3ExtnTable/cnDot3ExtnEntry, indexed by cnDot3ExtnIfIndex, and compare cnDot3ExtnIfAdminSpeed against cnDot3ExtnIfOperSpeed to detect a port that negotiated a lower speed than intended, indicating a cabling or NIC compatibility issue. Similarly, comparing cnDot3ExtnIfAdminConnectionType to cnDot3ExtnIfOperConnectionType would reveal whether a port fell back to half-duplex or a different connection mode than configured, a common cause of intermittent packet loss on legacy Ethernet links.

SNMP MIB extending IEEE 802.3 (Ethernet) definitions with Nortel Centillion-specific enhancements for managing Ethernet interfaces on Nortel/Bay Networks ATM switches and network devices.