MS250-24P Port Oversubscription/ASIC design

[Unsuited0873]

Hi,

Does anybody know how the Gigabit ports on the MS250-24P are connected to the ASICs, and how many ports share the same amount of switching capacity? I have 10 APs I want to connect to the switch in the best way to share the switching capability of the switch. I'm guessing that just plugging the 10 APs into Ports 1 to 10 doesn't result in the best performance, and there is a better way of distributing these across all of the 24 interfaces. There will be nothing else connecting to the Gigabit ports. All four SFP+ interfaces (25-28) will be used to connect to the core switch, in case the use of the SFP+ ports also affect the Gigabit oversubscription.

Thanks.

[JosRus · Accepted solution]

Hi @Unsuited0873!  

The KB article states that model has a switching capacity of 128 Gbps, with a separate stacking bandwidth stated of 80 Gbps. 

At line rate, that should be 1Gbps up and down on each RJ45 port plus 10Gbps up/down on each SFP+ port, as:
24 ports x 2 Gbps (up/down) plus 4 ports x 20 Gbps (up/down) = 128 Gbps. 

The math is true for the 48 port models too, as a max capacity of 176 Gbps is (48 x 2) + (4 x 20). 

With this in mind, you should not need to be concerned about ASIC-level distribution as the switching capacity indicates the maximum line rate is achievable across all ports.

[Unsuited0873]

Thank you for the reply.