RE: [OpenVMPS-devel] Switch "forgetting" macs after a while ?

[Marc B. <mar...@ho...>]

This is the MAC-Address table aging time, you are referring to.
You can use the 'mac-address-table aging-time 0' command to have the mac-addresses
only age out when the link to the switch port goes down.

We have the same thing happen on our network but it is effectively not a problem
since we don't use dynamic vlans with servers, and as soon as a client does some
traffic the switch queries VMPS and puts it back in the correct vlan.

Thanks,

Marc Bourgeois
ResNet Student Manager

-----Original Message-----
From: vmp...@li...
[mailto:vmp...@li...] On Behalf Of Sean Boran
Sent: Wednesday, March 23, 2005 9:51 AM
To: vmp...@li...
Subject: [OpenVMPS-devel] Switch "forgetting" macs after a while ?

Hi,

I have a situation with several Hosts on one port, via an unmanaged switch.
I know its not a good idea, but this cofiguration has worked for me until
now with Workstations. The Default vlan is --NONE-- so unknown MACs are
simply dropped.

I now have 3 servers on one port, and one of these can go for hours without
generating traffic. And it disappears from the network (no longer responds
to ping). If I didable VMPS, i.e. static vlans, the effect disappears.

I suspect that 
- the switch caches the MACs it sees on a port for a while, 
- and when it does a VMPS confirm (every hour), it requests VMPS authen for
MACs that it remembers on that port.
- if a host does not generate traffic for a few hours, the switch forgets
it, and therefore doesn't answer any traffic addresses to that MAC, or
request re-authentation

Am I making sense here? :-)
Can anyone suggest a worksround?

Thanks in advance,

Sean Boran



-------------------------------------------------------
This SF.net email is sponsored by: 2005 Windows Mobile Application Contest
Submit applications for Windows Mobile(tm)-based Pocket PCs or Smartphones
for the chance to win $25,000 and application distribution. Enter today at
http://ads.osdn.com/?ad_id=6882&alloc_id=15148&op=click
_______________________________________________
Vmps-devel mailing list
Vmp...@li...
https://lists.sourceforge.net/lists/listinfo/vmps-devel