Are you aware of the work done in various forums to address this?
For one of the more recent presentations look at
http://www.nanog.org/mtg-0306/ward.html
Pete
----- Original Message -----
From: "Evgeny Dolgopiat" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Cc: "Rogier R. Mulhuijzen" <[EMAIL PROTECTED]>; "Archie Cobbs" <[EMAIL PROTECTED]>
Sent: Wednesday, June 11, 2003 1:41 PM
Subject: Link failure detection algorithm for one2many netgraph node.
> Hello, All!
>
> I have developed a simple link failure detection algorithm for one2many
> netgraph node. I called it "heartbeat algorithm" :)
>
> This is brief description:
>
> What is it
> Link failure determination for one2many netgraph node.
>
> How it works
> It is implemented as "heartbeat" packet counters on all one2many tranked
> interfaces. If the number of
> packest hook received is less for some specified value than max number of
> packest, received by another hooks
> of the node, then interface is marked as failed (subnet or link failure). If
> this difference is less than this value and
> interface is marked as failed, then interface is up and working.
>
> How to setup
> Algorithm number is 2, so to configure node one should issue "setconfig
> {xmitAlg=1 failAlg=2}" message.
> There are two params of algorithm:
> timeout - time between sending of hearbeat packets (integer number of 1/10
> sec)
> period - number of timeouts for failure determination statistics
> Default values are timeout=10 and period=10.
> Two new node messages: "gethbconfig" and "sethbconfig {timeout=X period=Y}"
> for getting and setting
> heartbeat algorithm params.
>
> Tech data
> "Heartbeat" packet uses ethernet broadcast address (ff:ff:ff:ff:ff:ff) and
> packet type set to
> NG_ONE2MANY_HEARTBEAT_PROTO in the ethernet header. Expected timings are:
> failure determination:
> average - 1.5*timeout*period
> worst - 2*timeout*period
> up determination:
> average - 0.5*timeout*period
> worst - timeout*period
>
> Author: Evgeny Dolgopiat <[EMAIL PROTECTED]>
>
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