I think we narrowed it down to a cheap media converter they supplied. It's a 10/100/1000 copper to gig fiber converter, which makes me think it's got a low grade switch inside that doesn't have a per-VLAN FDB.
On Wed, Dec 8, 2010 at 5:46 PM, Danijel <[email protected]> wrote: > 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 <[email protected]> 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:[email protected]] >> 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! >> >> >> >> >
