Must 40/100G uplink ports on a 10G switch be connected to another switch?cheaper 40gb optics/uplinks?3Com...
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Must 40/100G uplink ports on a 10G switch be connected to another switch?
cheaper 40gb optics/uplinks?3Com Baseline 2824 SFP Plus (HP JE738A) VLANsHow to troubleshoot reason why ARP replies from ISP are not forwarded through our switch?Trouble Cascading VLANs Cisco SwitchesHow did I break (half of) my network?LACP and how to configure switches correctlyCan all ports on nowadays switches act as uplink ports?Managed switch uplink without “no switchport”Cisco/Meraki switch SFP compatibility and dual linkCan I aggregate multiple uplink ports between Ethernet switches?
I'm looking at a switch like this:
https://www.fs.com/products/29123.html
It has 48 10-GbE SFP+ ports and 6 40-GbE uplink ports. I would like to use some of these uplinks to cross-connect to another switch. In addition to that, however, I have a server with a 40-GbE capable NIC in it. Can this be connected directly to the 40-GbE port on the switch and "just work," or are these uplink ports special in that they must connect to uplink ports on another switch?
I know this used to be a thing for copper-based cabling before Auto-MDIX became commonplace, but it's not clear to me whether it's still an issue for modern SFP/QSFP-based connections.
switch uplinks 40g
asked 1 hour ago
Jason RJason R
1283
add a comment |
I'm looking at a switch like this:
https://www.fs.com/products/29123.html
It has 48 10-GbE SFP+ ports and 6 40-GbE uplink ports. I would like to use some of these uplinks to cross-connect to another switch. In addition to that, however, I have a server with a 40-GbE capable NIC in it. Can this be connected directly to the 40-GbE port on the switch and "just work," or are these uplink ports special in that they must connect to uplink ports on another switch?
I know this used to be a thing for copper-based cabling before Auto-MDIX became commonplace, but it's not clear to me whether it's still an issue for modern SFP/QSFP-based connections.
switch uplinks 40g
asked 1 hour ago
Jason RJason R
1283
1
Without knowing the server specs, one can't say for sure, but I would expect that the NIC was designed to connect to a switch (you could ask what else would it connect to?).
– Ron Trunk
1 hour ago
The server has this Mellanox NIC in it. I was making the assumption that there would be a standard answer to this type of question, as it's just a "vanilla" Ethernet NIC. The inherent question is whether the uplink ports on a switch like this are functionally any different from the others.
– Jason R
1 hour ago
add a comment |
I'm looking at a switch like this:
https://www.fs.com/products/29123.html
It has 48 10-GbE SFP+ ports and 6 40-GbE uplink ports. I would like to use some of these uplinks to cross-connect to another switch. In addition to that, however, I have a server with a 40-GbE capable NIC in it. Can this be connected directly to the 40-GbE port on the switch and "just work," or are these uplink ports special in that they must connect to uplink ports on another switch?
I know this used to be a thing for copper-based cabling before Auto-MDIX became commonplace, but it's not clear to me whether it's still an issue for modern SFP/QSFP-based connections.
switch uplinks 40g
asked 1 hour ago
Jason RJason R
1283
I'm looking at a switch like this:
https://www.fs.com/products/29123.html
It has 48 10-GbE SFP+ ports and 6 40-GbE uplink ports. I would like to use some of these uplinks to cross-connect to another switch. In addition to that, however, I have a server with a 40-GbE capable NIC in it. Can this be connected directly to the 40-GbE port on the switch and "just work," or are these uplink ports special in that they must connect to uplink ports on another switch?
I know this used to be a thing for copper-based cabling before Auto-MDIX became commonplace, but it's not clear to me whether it's still an issue for modern SFP/QSFP-based connections.
switch uplinks 40g
switch uplinks 40g
asked 1 hour ago
Jason RJason R
1283
asked 1 hour ago
Jason RJason R
1283
asked 1 hour ago
Jason RJason R
1283
asked 1 hour ago
Jason RJason R
1283
asked 1 hour ago
Jason RJason R
1283
1283
1
Without knowing the server specs, one can't say for sure, but I would expect that the NIC was designed to connect to a switch (you could ask what else would it connect to?).
– Ron Trunk
1 hour ago
The server has this Mellanox NIC in it. I was making the assumption that there would be a standard answer to this type of question, as it's just a "vanilla" Ethernet NIC. The inherent question is whether the uplink ports on a switch like this are functionally any different from the others.
– Jason R
1 hour ago
add a comment |
1
Without knowing the server specs, one can't say for sure, but I would expect that the NIC was designed to connect to a switch (you could ask what else would it connect to?).
– Ron Trunk
1 hour ago
The server has this Mellanox NIC in it. I was making the assumption that there would be a standard answer to this type of question, as it's just a "vanilla" Ethernet NIC. The inherent question is whether the uplink ports on a switch like this are functionally any different from the others.
– Jason R
1 hour ago
1
1
Without knowing the server specs, one can't say for sure, but I would expect that the NIC was designed to connect to a switch (you could ask what else would it connect to?).
– Ron Trunk
1 hour ago
Without knowing the server specs, one can't say for sure, but I would expect that the NIC was designed to connect to a switch (you could ask what else would it connect to?).
– Ron Trunk
1 hour ago
The server has this Mellanox NIC in it. I was making the assumption that there would be a standard answer to this type of question, as it's just a "vanilla" Ethernet NIC. The inherent question is whether the uplink ports on a switch like this are functionally any different from the others.
– Jason R
1 hour ago
The server has this Mellanox NIC in it. I was making the assumption that there would be a standard answer to this type of question, as it's just a "vanilla" Ethernet NIC. The inherent question is whether the uplink ports on a switch like this are functionally any different from the others.
– Jason R
1 hour ago
add a comment |
1 Answer
1
active
oldest
votes
That switch uses (Q)SFP+ ports which are essentially PHYless. You need to either use matching PHY type transceivers on both the switch and the host ports (e.g. 10GBASE-SR or 40GBASE-SR4) or direct-attach cables that are compatible with both sides.
The Mellanox NIC has QSFP28 ports that should support QSFP+ modules as well - check the documentation.
Note that most switches or NICs only support correctly branded transceivers - directly from the vendor or 3rd party compatible ones.
Whether the switch connects to a host or to another switch generally doesn't matter, assuming the port functions are configured appropriately.
MDI/MDI-X/Auto MDI-X are a special function of twisted-pair ports. The reason is that TP cables are straight-through historically and the receiver/transmitter crossover happens inside one of the link ports.
(Q)SFP(+) ports are all the same, the crossover happens within the cable (fiber or DAC).
answered 37 mins ago
Zac67Zac67
30.4k21860
add a comment |
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That switch uses (Q)SFP+ ports which are essentially PHYless. You need to either use matching PHY type transceivers on both the switch and the host ports (e.g. 10GBASE-SR or 40GBASE-SR4) or direct-attach cables that are compatible with both sides.
The Mellanox NIC has QSFP28 ports that should support QSFP+ modules as well - check the documentation.
Note that most switches or NICs only support correctly branded transceivers - directly from the vendor or 3rd party compatible ones.
Whether the switch connects to a host or to another switch generally doesn't matter, assuming the port functions are configured appropriately.
MDI/MDI-X/Auto MDI-X are a special function of twisted-pair ports. The reason is that TP cables are straight-through historically and the receiver/transmitter crossover happens inside one of the link ports.
(Q)SFP(+) ports are all the same, the crossover happens within the cable (fiber or DAC).
answered 37 mins ago
Zac67Zac67
30.4k21860
add a comment |
That switch uses (Q)SFP+ ports which are essentially PHYless. You need to either use matching PHY type transceivers on both the switch and the host ports (e.g. 10GBASE-SR or 40GBASE-SR4) or direct-attach cables that are compatible with both sides.
The Mellanox NIC has QSFP28 ports that should support QSFP+ modules as well - check the documentation.
Note that most switches or NICs only support correctly branded transceivers - directly from the vendor or 3rd party compatible ones.
Whether the switch connects to a host or to another switch generally doesn't matter, assuming the port functions are configured appropriately.
MDI/MDI-X/Auto MDI-X are a special function of twisted-pair ports. The reason is that TP cables are straight-through historically and the receiver/transmitter crossover happens inside one of the link ports.
(Q)SFP(+) ports are all the same, the crossover happens within the cable (fiber or DAC).
answered 37 mins ago
Zac67Zac67
30.4k21860
add a comment |
That switch uses (Q)SFP+ ports which are essentially PHYless. You need to either use matching PHY type transceivers on both the switch and the host ports (e.g. 10GBASE-SR or 40GBASE-SR4) or direct-attach cables that are compatible with both sides.
The Mellanox NIC has QSFP28 ports that should support QSFP+ modules as well - check the documentation.
Note that most switches or NICs only support correctly branded transceivers - directly from the vendor or 3rd party compatible ones.
Whether the switch connects to a host or to another switch generally doesn't matter, assuming the port functions are configured appropriately.
MDI/MDI-X/Auto MDI-X are a special function of twisted-pair ports. The reason is that TP cables are straight-through historically and the receiver/transmitter crossover happens inside one of the link ports.
(Q)SFP(+) ports are all the same, the crossover happens within the cable (fiber or DAC).
answered 37 mins ago
Zac67Zac67
30.4k21860
That switch uses (Q)SFP+ ports which are essentially PHYless. You need to either use matching PHY type transceivers on both the switch and the host ports (e.g. 10GBASE-SR or 40GBASE-SR4) or direct-attach cables that are compatible with both sides.
The Mellanox NIC has QSFP28 ports that should support QSFP+ modules as well - check the documentation.
Note that most switches or NICs only support correctly branded transceivers - directly from the vendor or 3rd party compatible ones.
Whether the switch connects to a host or to another switch generally doesn't matter, assuming the port functions are configured appropriately.
MDI/MDI-X/Auto MDI-X are a special function of twisted-pair ports. The reason is that TP cables are straight-through historically and the receiver/transmitter crossover happens inside one of the link ports.
(Q)SFP(+) ports are all the same, the crossover happens within the cable (fiber or DAC).
answered 37 mins ago
Zac67Zac67
30.4k21860
edited 24 mins ago
answered 37 mins ago
Zac67Zac67
30.4k21860
answered 37 mins ago
Zac67Zac67
30.4k21860
answered 37 mins ago
Zac67Zac67
30.4k21860
30.4k21860
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Without knowing the server specs, one can't say for sure, but I would expect that the NIC was designed to connect to a switch (you could ask what else would it connect to?).
– Ron Trunk
1 hour ago
The server has this Mellanox NIC in it. I was making the assumption that there would be a standard answer to this type of question, as it's just a "vanilla" Ethernet NIC. The inherent question is whether the uplink ports on a switch like this are functionally any different from the others.
– Jason R
1 hour ago