https://community.extremenetworks.com/t5/extremeswitching-exos-switch/what-is-the-stacking-bandwidth-of-x450-g2-switches-in-data-sheet/m-p/84358#M20417 Hi!<BR /> <BR /> All X440s (assuming they're not G2 generation) has dedicated stacking ports except the Summit X440-24t-10G and X440-24p-10G. Those two latter can be stacked with the 10 G ports in the front. The dedicated stacking ports are really 10 G ports, but marketing-wise they say it 40 G SummitStack, where they count each link both TX and RX of 10 G and then you have two links, so that makes it 10 G * 2 links * 2 directions (TX/RX), making it 40 G stacking... Well, they're not alone in doing so, but in reality, it's 10 G links.<BR /> <BR /> For the original X450 (not X450e and X450a), you need to use SummitStack modules that you put in the rear of the switch.<BR /> <BR /> SummitStack ports require a special cable, not the standard DAC or RJ45.<BR /> <BR /> If you mean G2 models, stacking is done via 10 G SFP ports or, in some models, with a special 21 G port:<BR /> <BR /> "Up to eight Summit X450-G2 switches can be stacked using two different methods of stacking: SummitStack-V, and SummitStack-V84. Each X450-G2 unit comes equipped with 2 ports of 21 Gigabit stacking ports via a QSFP interface. Standard passive 40Gb copper cables can be used for stacking X450-G2s together."<BR /> <BR /> Hope this helps!<BR /> <BR /> /Fredrik<BR /> <BR /> PS Sorry, didn't read the subject line, but the answer is there for X450-G2 as well  As mentioned, SummitStack-V is 4x10G more or less... Wed, 14 Aug 2019 16:57:38 GMT FredrikB 2019-08-14T16:57:38Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/what-is-the-stacking-bandwidth-of-x450-g2-switches-in-data-sheet/m-p/84357#M20416 I just want to know the total stacking bandwidth of X450 and X440 switches.. I think x460- G2 supports upto 160Gbps stacking.. Mon, 12 Aug 2019 13:34:01 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/what-is-the-stacking-bandwidth-of-x450-g2-switches-in-data-sheet/m-p/84357#M20416 Srinivas_K1 2019-08-12T13:34:01Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/what-is-the-stacking-bandwidth-of-x450-g2-switches-in-data-sheet/m-p/84358#M20417 Hi!<BR /> <BR /> All X440s (assuming they're not G2 generation) has dedicated stacking ports except the Summit X440-24t-10G and X440-24p-10G. Those two latter can be stacked with the 10 G ports in the front. The dedicated stacking ports are really 10 G ports, but marketing-wise they say it 40 G SummitStack, where they count each link both TX and RX of 10 G and then you have two links, so that makes it 10 G * 2 links * 2 directions (TX/RX), making it 40 G stacking... Well, they're not alone in doing so, but in reality, it's 10 G links.<BR /> <BR /> For the original X450 (not X450e and X450a), you need to use SummitStack modules that you put in the rear of the switch.<BR /> <BR /> SummitStack ports require a special cable, not the standard DAC or RJ45.<BR /> <BR /> If you mean G2 models, stacking is done via 10 G SFP ports or, in some models, with a special 21 G port:<BR /> <BR /> "Up to eight Summit X450-G2 switches can be stacked using two different methods of stacking: SummitStack-V, and SummitStack-V84. Each X450-G2 unit comes equipped with 2 ports of 21 Gigabit stacking ports via a QSFP interface. Standard passive 40Gb copper cables can be used for stacking X450-G2s together."<BR /> <BR /> Hope this helps!<BR /> <BR /> /Fredrik<BR /> <BR /> PS Sorry, didn't read the subject line, but the answer is there for X450-G2 as well  As mentioned, SummitStack-V is 4x10G more or less... Wed, 14 Aug 2019 16:57:38 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/what-is-the-stacking-bandwidth-of-x450-g2-switches-in-data-sheet/m-p/84358#M20417 FredrikB 2019-08-14T16:57:38Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/what-is-the-stacking-bandwidth-of-x450-g2-switches-in-data-sheet/m-p/84359#M20418 Hi,<BR /> <BR /> I am talking about X450-g2 switches.. what will be the maximum stacking bandwidth it will support.. Wed, 14 Aug 2019 18:52:06 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/what-is-the-stacking-bandwidth-of-x450-g2-switches-in-data-sheet/m-p/84359#M20418 Srinivas_K1 2019-08-14T18:52:06Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/what-is-the-stacking-bandwidth-of-x450-g2-switches-in-data-sheet/m-p/84360#M20419 Hi!<BR /> <BR /> As stated above, SummitStack-V84 consists of 21 Gbps interfaces, so I guess that's the answer you're after.<BR /> <BR /> /Fredrik<BR /> <BR /> PS X460-G2 can use proper 40 G ports for stacking just as you stated in your first post, but X450-G2 maxes out at 21 Gbps. Wed, 14 Aug 2019 19:56:21 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/what-is-the-stacking-bandwidth-of-x450-g2-switches-in-data-sheet/m-p/84360#M20419 FredrikB 2019-08-14T19:56:21Z