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Of course, it´s possible. e.g. interface GigabitEthernet1/0/1 port link-type hybrid undo port hybrid vlan 1 port hybrid vlan 5 untagged port hybrid pvid vlan 5 : : interface GigabitEthernet1/0/9 port link-type hybrid undo port hybrid vlan 1 port hybrid vlan 6 untagged port hybrid pvid vlan 6...

Seems I was wrong, sorry for this. According to 5120SI-CMW520-R1505P07 Release Notes QinQ is supported.

Well, it´s simple. QinQ is not supported on S5120. I think you need at least the S5500 was it -EI(?) series for this

I got some cheap 3coms, too. 2924 and 2928. - 2924: "old" firmware. Almost no features. - 2928: that firmware is over 9 MB! Well, in contrast to the old ones, this one is full of features. For a layer 2 switch it is enough. NTP, of course there´s support for it. If you reboot it will happily...

http://www.cisco.com/application/pdf/en/us/guest/netsol/ns432/c649/ccmigration_09186a00805fccbf.pdf layer 3 routed access...

Well, let´s write en email to 3com support and see what they say about this... http://emea.3com.com/support/returns/forms/contact/

answer from 3com: "There is an F2206 release of code, but this is currently restricted to specific customers with special requirements (The F stands for ?Feature code? ? i.e. code including new software features that are still being evaluated/tested). When the software is ready for general...

//The most recent version on the list is S4800G-CMW520-F2206L06 - released April 2010. Where do you find that release? On http://www.3com.com/swd/jsp/user/result.jsp?selected=6&sort=effdt&sku=3CRS48G-48-91&order=desc I can only find 5.20-R2202P15

http://forums13.itrc.hp.com/service/forums/categoryhome.do?categoryId=269 is yours Btw, I´d go for the E4800 series, it´s much more powerful in terms of protocol/routing support...

Thanks four the information. So some additional costs for stacking that switch. Well, the 4800G arrived today. I "played" a little with it. First thing, "conf t" is becoming system-view "show" is becoming display Well, I get used to it...

Well, I ordered one. Let´s see how it is...

Thanks for your info. Looking at the spec sheet, it says that it can be stacked

Well, I obviously did and the price difference is high. Back to my initial questions. Let´s talk about the 4800G series...

Well, according to HP both series, 3com and HP will be continued. But what do you suggest?

Hi, we are going to upgrade our layer 3 switches. Basically we will go from 100 Mbit/s to 1000 Mbit/s. cabling is Cat6 or OM2, so no problem. OSPFv2 for IPv4 is needed, well as those switches will have to stay for a while IPv6 is necessary, too. Although it isn´t needed for now. DHCP-Snooping...