[Bridge] Clear a mac from table?

[Bridge] Clear a mac from table?

[Brad Dameron]

Anyone know of a way to clear a mac from the bridge hash table instead
of waiting for it to expire? This would be handy with pushing people
between vlans that are on the same switch.

Brad Dameron
Network Engineer - TierII
Clearw're

Re: [Bridge] Clear a mac from table?

[Stephen Hemminger]

On Fri, 26 Jan 2007 16:30:05 -0800
Brad Dameron <brad.dameron@clearwire.com> wrote:

> 
> Anyone know of a way to clear a mac from the bridge hash table instead
> of waiting for it to expire? This would be handy with pushing people
> between vlans that are on the same switch.

No API exists but the first transmit (gratuitous ARP?) would
move the entry.

Re: [Bridge] Clear a mac from table?

[Brad Dameron]

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This is true. But here is a scenario we are seeing. Here is our setup first.
 
Customer is on Vlan4 which is bridged to VLAN10. Both vlan's are on the same switch. If data is streaming in on vlan10 to the vlan4 bridge, then we switch the customer to vlan10, the streaming data will continue on to the bridge server and the customer will not be able to transfer data until that stream dies or if the timer just happens to be expiring for that MAC. So we need to clear the mac. I did a brctl setageing 3 to set the timer lower. But what effect could this have when I have some 50k to 100k mac's known by the bridging server?
 
Thanks,
Brad Dameron
Clearw're
Network Engineer TierII
 

________________________________

From: Stephen Hemminger [mailto:shemminger@linux-foundation.org]
Sent: Fri 1/26/2007 9:09 PM
To: Brad Dameron
Cc: bridge@lists.osdl.org
Subject: Re: [Bridge] Clear a mac from table?



On Fri, 26 Jan 2007 16:30:05 -0800
Brad Dameron <brad.dameron@clearwire.com> wrote:

>
> Anyone know of a way to clear a mac from the bridge hash table instead
> of waiting for it to expire? This would be handy with pushing people
> between vlans that are on the same switch.

No API exists but the first transmit (gratuitous ARP?) would
move the entry.



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Re: [Bridge] Clear a mac from table?

[Stephen Hemminger]

On Sat, 27 Jan 2007 16:46:22 -0800
"Brad Dameron" <Brad.Dameron@clearwire.com> wrote:

> This is true. But here is a scenario we are seeing. Here is our setup first.
>  
> Customer is on Vlan4 which is bridged to VLAN10. Both vlan's are on the same switch. If data is streaming in on vlan10 to the vlan4 bridge, then we switch the customer to vlan10, the streaming data will continue on to the bridge server and the customer will not be able to transfer data until that stream dies or if the timer just happens to be expiring for that MAC. So we need to clear the mac. I did a brctl setageing 3 to set the timer lower. But what effect could this have when I have some 50k to 100k mac's known by the bridging server?
>  
> Thanks,
> Brad Dameron
> Clearw're
> Network Engineer TierII

If you remove vlan from bridge (or force carrier down), then
the entries are purged

-- 
Stephen Hemminger <shemminger@linux-foundation.org>