RC-SLPP-MIB

Description: Manages Simple Loop Prevention Protocol (SLPP) configuration and port blocking state on Bay Networks Rapid-City switches.

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RC-SLPP-MIB is a Bay Networks/Nortel (Rapid-City "rc" prefix, later Avaya) enterprise MIB module for the Simple Loop Prevention Protocol (SLPP), a proprietary mechanism used on Ethernet switches to detect and block Layer 2 loops. It exposes configuration data such as global enable state, SLPP PDU transmission interval, timeout, the Ethernet type used for SLPP frames, per-VLAN SLPP enablement, and per-port loop-blocking (UNI port) settings. As a monitoring tool it is used chiefly to track the operational/configuration status of the loop-prevention feature -- whether SLPP is enabled, which VLANs and ports are guarded, and whether a port has been automatically shut down due to a detected loop -- rather than hardware health metrics. It notably depends on standard Bridge/VLAN MIB concepts (ifIndex, VLAN identifiers) for correlating ports and VLANs to physical interfaces. It is typically deployed on Nortel/Avaya Ethernet Routing Switches in campus or data center networks to prevent broadcast storms caused by accidental Layer 2 loops, and network engineers typically begin with an RC-SLPP-MIB download to load its objects into a MIB browser before polling.

An administrator polls rcSlppGlobalEnable and rcSlppVlanTable (rcSlppVlanVlanId, rcSlppVlanSlppEnable) to confirm SLPP is active on specific VLANs, and checks rcSlppPortTable together with rcSlppUniPorts to see which ports are configured as loop-guard "UNI" ports. If a technician miswires a patch cable creating a loop, rcSlppNotifications/rcSlppNotificationObjects fire an SNMP trap and the affected port's blocked state can be confirmed by re-reading rcSlppPortTable, indicating the port was disabled to stop the loop. Values in rcSlppTransmissionInterval and rcSlppTimeout can also be checked to verify the protocol's detection timing matches network design.

Nortel Rapid City Switch Link Port Protection Protocol for loop detection.