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Force update Switch Address Table.

To: "LinuxVirtualServer.org users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Force update Switch Address Table.
From: "Carlos J. Ramos" <cjramos@xxxxxxxxxxx>
Date: Mon, 15 Dec 2003 17:26:54 +0100
Hello all.

We are facing an issue against an HP Procurve Switch 2124, used in a
cluster using Heartbeat and Ldirectord as HA and Balancing mechanisms.

Well, everything works fine, till we make a takeover on directors. As
the switch documentation saids, the switch automatically learn MAC
address and associate it to its ports, so that although heartbeat
changes IP address, the switch try to use the same switch port, and this
situation remains for at least 1 hour... for this time the forwarding in
the cluster does not works... and realservers are unable to be reached
from outside...

Of course... such delay in doing the takeover beween directors is
unacceptable. I had been looking in HP FAQ, and found something may be
relevant; they say that the switch is not supported for DHCP servers, at
least a DHCP server makes the same thing that HA makes... i mean move
one IP address from one switch port to another...

Is there any way to force the switch to refresh MAC Address Table?, is
there any Linux tool that sent any kind of packet over the net forcing
the ARP Table to be updated?

Thanks for the help.

-- 
--------------------------------------------------------
Carlos J. Ramos                 Genasys II Spain, S.A.U.
Administrador de Sistemas       Ventura de la Vega 5
Tel:+34-91-3649100 ext 170      28014 Madrid
Fax:+34-91-3649119              Spain
Email:  cjramos@xxxxxxxxxx
--------------------------------------------------------

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