ravikumarb | 17 Jul 14:54 2006

New trap


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
        "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
    ::= { dot1dNotifications 3 }

Please let us know your thoughts regarding the proposed trap.

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David B Harrington | 17 Jul 16:09 2006

RE: New trap


Maintenance of the Bridge Mib modules has been taken over by the IEEE
802.1 WG.

As a result, this proposal is out of scope for the Bridge MIB WG
mailing list.
   The appropriate mailing list for IEEE 802.1 MIB module discussion
   is STDS-802-1-L <at> listserv.ieee.org.
   To subscribe to the STDS-802-1-L list, go to
   To see the general information about 802,1, including how they
   work and how to participate, go to http://www.ieee802.org/1/
   To see presentations on the technology, go to
   http://www.ieee802.org/1/files/public/ and look in the docs2004,
   docs2005, and docs2006 directories. 

David Harrington
dharrington <at> huawei.com 
dbharrington <at> comcast.net
ietfdbh <at> comcast.net
co-chair, Bridge-MIB WG 

> -----Original Message-----
> From: ravikumarb [mailto:ravikumarb <at> infosys.com] 
> Sent: Monday, July 17, 2006 8:55 AM
> To: bridge-mib <at> ietf.org
> Cc: kenyon.c.norseth <at> L-3com.com
> Subject: [Bridge-mib] New trap
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