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 <sc...@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:zeusda...@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! > > > >