Introduction to switch port FEC mode parameters

      We have introduced the switch port FEC mode configuration and viewing methods, also mentioned that the FEC function is determined by the negotiation between the two ends of the link, specifically refer to How To Configure Switch Interface FEC Mode ; and the FEC function also has different modes to choose from, and different host brands or different models of hosts to provide FEC mode options are different, named differently, resulting in the user in the use of the optical module docking different brands or different models of hosts, it is easy to make a difficult choice on the FEC mode, then the next to list some of the mainstream host manufacturers to provide FEC mode parameters. Different host brands or different models of hosts provide different FEC mode options and different names, resulting in users using optical modules to interface with different brands or different models of hosts, it is easy to make a mistake on the FEC mode selection, so the next to give you a list of some of the mainstream hosts provided by the FEC mode parameter to introduce the different FEC modes.
      ModuleTek has tested and organized the FEC configuration methods for 25G/100G switch ports of mainstream vendors and the parameters under the FEC command as follows:

Table 1 Mainstream Vendor 25G/100G Switch Port FEC Configuration Methods and FEC Commands

      1.BASE-R FEC, the name comes from IEEE 802.3 CLAUSE 74 (BASE-R PHYS), also known as FC-FEC, FIRE-CODE FEC, CL74, FEC74, CL74-FC and so on;
      2. RS-FEC, which is divided into the following two types:
      Applicable to 100G, the name is derived from IEEE 802.3 CLAUSE 91 (100GBASE-R PHYS), also known as REED-SOLOMON FEC, RS, CL91, FEC91, CL91-RS, etc.;
      For 25G, the name is derived from IEEE 802.3 CLAUSE 108 (25GBASE-R PHYS), aka REED-SOLOMON FEC, RS, CL108, FEC108, CL108-RS, etc;

Figure 1 Intercept from the relevant section of IEEE Std 802.3

      Attention:
      1. some models need to access the optical module in order to configure the interface FEC mode, without access to the module without this instruction, such as Huawei CE6860;
      2. some models will not prevent the user from configuring the unsupported FEC mode even if the user configures it, but it may not take effect in practice, and you need to pay attention to the real configuration presented by the port configuration, such as Juniper QFX5200;
      3. the port can be configured FEC mode depends on the type of module, the same type of module standards of different host manufacturers also differ, optical modules in docking different models of switches need to pay attention to both sides of the link FEC mode is consistent.
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