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Re: INTELLIGENT FORWARDING OF TRAPS

To: nv-l@lists.tivoli.com
Subject: Re: INTELLIGENT FORWARDING OF TRAPS
From: Cheryl Krupczak <cheryl@EMPIRETECH.COM>
Date: Thu, 1 Oct 1998 16:04:19 -0400
In-reply-to: <3.19981001.12.04.28.518843@IBMMAIL.COM> from "Ken Freeman, Woolwich plc" at Oct 1, 98 12:04:28 pm
Reply-to: Discussion of IBM NetView and POLYCENTER Manager on NetView et alia <NV-L@UCSBVM.UCSB.EDU>
Sender: Discussion of IBM NetView and POLYCENTER Manager on NetView et alia <NV-L@UCSBVM.UCSB.EDU>
Hello,

>When a management station receives a trap that has been forwarded by
>TrapEXPLODER will it report it a coming from the original agent or will it
>believe the trap to have originated at the TrapEXPLODER system?

  Good Question!  Here's the answer:
  We preserve the original agent address in the SNMP Trap PDU.

SNMP Trap PDU:

  ---------------------------------------------------------------------
  | enterprise | agent | generic   | specific  | time  | variable     |
  |   ID       | addr  | trap type | trap type | stamp | bindings . . |
  ---------------------------------------------------------------------

An SNMP Trap PDU gets carried as payload in a UDP PDU.

>
>We have tried to forward traps from NetView but the receiving management
>station always reports NetView as the origin which is not what we require.

  A management station should look at the agent address in the
  SNMP Trap PDU (not the UDP packet header) to determine what
  agent the trap came from.

>
>Thanks
>
>Ken Freeman   <gbwbsjhs@ibmmail.com>
>Woolwich plc
>


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