[e-nsp] VLAN/FDB/MAC question

[Fabian]

Hello Hay,

All Extreme switches (although the very old one) have a MAC Address table that is per VLAN.

Here is an extract of the Concept Guide :
	FDB Contents
		Each Forwarding Database (FDB) entry consists of:
			● The MAC address of the device
			● An identifier for the port and VLAN on which it was received
			● The age of the entry
			● Flags
		Frames destined for MAC addresses that are not in the FDB are flooded to all members of the VLAN

Extreme switches are using VRRP on multiple switches with the same VRRid, and they are using the System MAC Address (1 and unique MAC Address for each system) for routing for example.

If this were not possible, you would see only 1 entry for the HSRP MAC in the FDB table.

Could you pls send me directly the case number you used so I can check.

Many thanks, Fabian.

-----Original Message-----
From: extreme-nsp-bounces at puck.nether.net [mailto:extreme-nsp-bounces at puck.nether.net] On Behalf Of Jay Nakamura
Sent: vendredi 12 mars 2010 20:50
To: extreme-nsp at puck.nether.net
Subject: Re: [e-nsp] VLAN/FDB/MAC question

To answer my own question, Extreme Support says this is by design and
they only have one FDB per switch and can't be fixed.

Consensus among other NSP lists is that it shouldn't be this way in
this day and age.

Does anyone have any counter information on this?  If this is the
case, I will have to drop using Extreme switches at all from now.

On Tue, Mar 9, 2010 at 11:51 AM, Jay Nakamura <zeusdadog at gmail.com> wrote:
> I am using a Extreme X-350-24t with
> ExtremeXOS version 12.0.4.5 v1204b5
>
> I noticed that if two frames with the same MAC address come in on
> totally different VLANs and ports, they both show up in the FDB but it
> doesn't seem to forward the packet correctly.
>
> The MAC address was the same because they were both using default
> Cisco HSRP virtual MAC address.
>
> Is this a normal behavior?  Or did I run into a bug?
>
> Any way to fix this problem?
>
> Thanks!
>

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