[Bridge-mib] New trap

Hi,

We would like to porpose a new trap for bridges so that they can detect malfunctioning neighbour bridges. Lets call it as "neighbourUnreachable". This trap will be generated by the bridge if it doesn't receive 5 consecutive Hello BPDUs from a port, which was receiving these messages earlier. This trap will be useful to detect cases where the bridge and its ports were functioning properly for some time and suddenly started malfunctioning due to a hardware glitch or a software bug. Note that link failure (down) trap won't be raised as the link is UP from the PHY point of view. This is analogous to Hello messages used by Routing Protocols to detect routing peers. This trap will be very useful for the NMS to take appropriate actions. Note that this is very different from "topologyChange" trap, which just tells that the port has transitioned to Blocking State from Forwarding State. This trap tells that the bridge is not functioning properly at all from the port's point of view. It has a specific meaning and is detected fast. Following would be its structure:

neighbourUnreachable NOTIFICATION-TYPE
    OBJECTS     { dot1dBaseBridgeAddress dot1dBasePort dot1dBasePortIfIndex }
    STATUS      current
    DESCRIPTION
        "A neighbourUnreachable trap is sent by a bridge when it
        doesn't receive 5 consecutive Hello BPDUs. This will
        allow a bridge to detect malfunctions of the neighbour
        bridge even when the link state to the neighbour bridge
        is UP. It is analogous to Hello messages used by Routing
        Protocols to detect whether the neighbour router is
        functional."
    ::= { dot1dNotifications 3 }

Please let us know your thoughts regarding the proposed trap.

Thanks & Regards,
Ravi

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