SONET and MAC address

Wed Dec 8 22:46:16 UTC 2010

Same thing with Siemens and Huawei gear, there are "transparent" cards that
don't learn anything and L2 cards that do.

-- 
*blap*

On Wed, Dec 8, 2010 at 22:57, Scott Berkman <scott at sberkman.net> wrote:

> Don't know the FlashWave gear well, but in the Cisco ONS/Cerent world GigE
> ports can be configured in different modes, some of which do in fact learn
> MAC addresses.  Others emulate a single layer-2 link and as the vendor
> stated, would not look at the MAC address at all.
>
>        -Scott
>
> -----Original Message-----
> From: Jay Nakamura [mailto:zeusdadog at gmail.com]
> Sent: Wednesday, December 08, 2010 3:33 PM
> To: NANOG
> Subject: SONET and MAC address
>
> We have a Gigabit Ethernet transport between cities by a vendor.  We found
> that when there are identical MAC address that are on different VLANs on
> different side of the circuit, one of the VLAN looses packets.  This
> situation came up because two different networks that travel over the
> Ethernet were using HSRP with the same virtual MAC address.
>
> The vendor says both sides are directly connected to Fujitsu SONET gear and
> the equipment doesn't even look at the MAC address so it's not their
> circuit.  All I know is, I can't recreate the problem if this circuit is
> not
> in the path.
>
> I haven't worked with Fujitsu SONET gear so I don't know if their claim is
> true or not.  I vaguely remember someone talking about some equipment
> actually having a builtin switch on the SONET port and that was messing up
> the forwarding.
>
> Also, on one side of the circuit, there is a copper to fiber media
> converter.  I am going to find out what model this is and see if that could
> be the cause.
>
> Anyone have any thoughts on what I should look into or have the vendor look
> into?  Anyone run into this situation?
>
> Thanks!
>
>
>
>