The ports of the core switch are mainly fiber type, but the price of the switch fiber port is very expensive, and users need to pay special attention. At the same time, the fiber port of the switch has no stacking ability and can only be used for cascade. Analyze the cascade connection methods and basic types of switch fiber ports.
The cascade can use either ordinary ports or special MDI-II ports. When the two ports cascaded to each other are ordinary ports (ie MDI-X) ports and MDI-II ports, a straight-through cable should be used. When the two ports cascaded to each other are ordinary ports (ie MDI-X) or both are MDI-II ports, a crossover cable should be used.
Whether it is 10Base-T Ethernet, 100Base-TX Fast Ethernet or 1000Base-T Gigabit Ethernet, the length of the cable used by the cascade switch can reach 100 meters, which is exactly the same as the length from the core switch to the computer. Therefore, in addition to expanding the number of ports, cascading is also used to quickly extend the network diameter. When there are 4 switches cascaded, the network span can reach 500 meters. This distance is enough for a small network located in the same building!
Using Uplink switch fiber port cascading Now, more and more switches (except Cisco switches) provide Uplink ports, making the connection between core switches easier. Uplink port is a port specially used to connect with other switches. You can use a straight jumper to connect this port to any port of other switches except Uplink port.
This connection is exactly the same as the connection between the computer and the switch. It should be noted that some brands of switches (such as 3Com) use a common port as an Uplink port, and use a switch (MDI / MDI-X switch) to switch between the two types. Use straight-through cables to cascade switches through Uplink ports.
Use common port cascade
If the core switch does not provide a dedicated cascade port (Uplink port), then you can only use crossover jumpers to connect the common ports of the two switches together to expand the number of network ports. It should be noted that when using ordinary ports to connect to the switch, you must use crossover cables instead of straight-through cables. Use crossover cables to cascade switches through common ports.
Cascading of switch fiber ports
Because the price of the switch fiber port is still very expensive, the fiber is mainly used for the connection between the core switch and the backbone switch, or for the cascading between the backbone switches. It should be noted that none of the switch fiber ports has the stacking capability and can only be used for cascading.
Optical fiber patch cord cross-connect
All switch fiber ports are two, one for each transmission and one for reception. Of course, there must also be two fiber jumpers, otherwise there will be no communication between the ports. When the core switch is cascaded through the core switch fiber port, the transceivers at both ends of the fiber jumper must be swapped. When one end is connected to "receive", the other end is connected to "send".
Similarly, when one end is connected to "send", the other end is connected to "receive". It is gratifying that the CiscoGBIC fiber modules are marked with the sending and receiving logos, and the inward arrow on the left indicates "receiving", and the outward arrow on the right indicates "sending". If both ends of the fiber jumper are connected to "receive" or "send", the LED indicator of the port is off, indicating that the connection is failed. The LED indicator will turn green only when the fiber port of the switch is successfully connected.
Cascading of switch fiber ports
Similarly, when the backbone switch is connected to the core switch, the fiber transceiver ports must also be cross-connected. Connection between core switch and backbone switch
Fiber jumper and switch fiber port type
Fiber jumpers are divided into single-mode fiber and multi-mode fiber. The fiber port and jumper of the switch must be consistent with the type of fiber used in the integrated wiring. That is to say, if the multimode fiber is used in the integrated wiring, the fiber interface of the switch must implement the 1000Base-SX standard Multimode fiber jumper; if single-mode fiber is used for integrated wiring, then the fiber optic interface of the switch must implement the 1000Base-LX / LH standard, and single-mode fiber jumpers must also be used.
It should be noted that there are two types of multimode fiber, namely 62.5 / 125μm and 50 / 125μm. Although the switch fiber ports are identical, and both also implement the 1000Base-SX standard, the core diameter of the fiber jumper must be exactly the same as the core diameter of the optical cable.
Otherwise, it will cause connectivity failure. In addition, the types of switch fiber ports connected to each other must be exactly the same, or both are multimode switch fiber ports, or are all single mode switch fiber ports. One end is a multimode switch fiber port, and the other end is a single mode switch fiber port, which will not be connected together.
Transmission rate and duplex mode
Unlike 1000Base-T, 1000Base-SX, 1000Base-LX / LH and 1000Base-ZX cannot support self-adaptation, and ports with different speeds and duplex working modes will not be able to connect and communicate.
Therefore, the interconnected fiber ports must have the same transmission rate and duplex working mode. It is not possible to connect the 1000Mbps switch fiber port with the 100Mbps fiber port, nor can the full duplex mode fiber port and half The fiber ports of the core switch in duplex mode are connected together, otherwise, it will cause connectivity failure.
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