You'll want to look into "port-group" functionality: [URL]    You can set a group of ports to behave as 10g.  Example:
We have a pair of Dell S5348F-ON switches that we are going to use to connect a new Dell storage server. We are having trouble bringing up any of the links and believe it may related to the speed of the link. Currently the switch ports are defaulting to 25Gib and the storage server's SFP+ ports max out at 10Gib. When trying to manually set the speed on the switch ports to 10Gib we receive an error. See the console output below. Here is the interface information: OS10# show interface ethernet 1/1/48Ethernet 1/1/48 is up, line protocol is downHardware is Eth, address is 8c:04:ba:a9:aa:f0Current address is 8c:04:ba:a9:aa:f0Pluggable media present, SFP+ type is SFP+ 10GBASE-CR-2.0MWavelength is 256Interface index is 61Internet address is not setMode of IPv4 Address Assignment: not setInterface IPv6 oper status: DisabledMTU 1532 bytes, IP MTU 1500 bytesLineSpeed 0, Auto-Negotiation onConfigured FEC is off, Negotiated FEC is offFlowcontrol rx on tx offARP type: ARPA, ARP Timeout: 60Last clearing of "show interface" counters: 23:37:40Queuing strategy: fifoInput statistics:0 packets, 0 octets0 64-byte pkts, 0 over 64-byte pkts, 0 over 127-byte pkts0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts0 Multicasts, 0 Broadcasts, 0 Unicasts0 runts, 0 giants, 0 throttles0 CRC, 0 overrun, 0 discardedOutput statistics:0 packets, 0 octets0 64-byte pkts, 0 over 64-byte pkts, 0 over 127-byte pkts0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts0 Multicasts, 0 Broadcasts, 0 Unicasts0 throttles, 0 discarded, 0 Collisions, wred dropsRate Info(interval 30 seconds):Input 0 Mbits/sec, 0 packets/sec, 0% of line rateOutput 0 Mbits/sec, 0 packets/sec, 0% of line rateTime since last interface status change: 23:37:41 Here is the output when trying to set the speed. OS10(config)# interface range ethernet 1/1/45-1/1/48 OS10(conf-range-eth1/1/45-1/1/48)# speed10 Set speed to 10 Mbps100 Set speed to 100 Mbps1000 Set speed to 1000 Mbps10000 Set speed to 10000 Mbps25000 Set speed to 25000 Mbps40000 Set speed to 40000 Mbps50000 Set speed to 50000 Mbps100000 Set speed to 100000 Mbpsauto Automatic Settings (default) OS10(conf-range-eth1/1/45-1/1/48)# speed 10000% Error: Speed 10000 not supported on interface ethernet1/1/45. When trying to do an individual interface we get: OS10(config)# interface ethernet 1/1/48OS10(conf-if-eth1/1/48)# speed 10000% Error: Illegal parameter. Any ideas would be helpful. Thanks!
S5248F-ON Link to servers not working.