SUMMARY: IP Multpathing

Well, Thanks to all who replied.  These are the resources I was pointed
to for IPMP

http://www.samag.com/documents/s=7933/sam0305a/0305a.htm

http://www.sun.com/blueprints/

http://www.eng.auburn.edu/users/doug/howtos/multipathing.html

http://www.sun.com/solutions/blueprints/0327-608/2011.pdf

But, I ended up not using IPMP, I can't have to active IP's.

So I wrote this little script to run.

<------------------ cut here ------------------------->

#!/bin/sh
# This script will check the status of the nic, and fail over if there
is a problem.
PATH=/bin:/sbin:/usr/bin:/usr/sbin

INTA="iprb0"
INTB="iprb1"
IP="10.64.16.1"
HBIP="192.168.255.1"

FAULT="$1"

PING="ping -c 1 -t 1"

while [ 1 = 1 ]
 do
  case $FAULT in
     1)
        $PING $IP >>fault.log 1>&2
        if [ $? = 1 ]
          then
            ifconfig $INTB $IP down
            ifconfig $INTB $HBIP netmask 255.255.255.252 -failover up
            ifconfig $INTA down
            ifconfig $INTA $IP netmask 255.255.0.0 failover up
            FAULT=2
        fi
       ;;
     2)
        $PING $IP >>fault.log 1>&2
        if [ $? = 1 ]
          then
            ifconfig $INTA $IP down
            ifconfig $INTA $HBIP netmask 255.255.255.252 -failover up
            ifconfig $INTB down
            ifconfig $INTB $IP netmask 255.255.0.0 failover up
            FAULT=1
        fi
        sleep 1
        ;;
     reset)
        ifconfig $INTB down
        ifconfig $INTB $HBIP netmask 255.255.255.252 -failover up
        ifconfig $INTA down
        ifconfig $INTA $IP netmask 255.255.0.0 failover up
        ;;
     *)
        echo "usage: $0 { 1 | 2 | reset } ( where 1 or 2 is the STANDBY
nic )"
        exit
        ;;
  esac
done

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------------------------------------->


The only problem is this will only fail over on a complete interface
failure,  A link failure will don nothing.  Does anyone have a take on
what I might do to sense a link failure (some ifconfig option maybe?).

Thanks for the help!!


Jeremy Russell
Network Administrator, CNI
580-272-2707
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