OTG RT5.4: Add FEC related config (#2083)

* add FEC related config

* address review comment

feature/interface/aggregate/otg_tests/aggregate_forwarding_viable_test/aggregate_forwarding_viable_test.go

@@ -365,6 +365,21 @@ func (tc *testArgs) configureATE(t *testing.T) {
 		}
 	}
 
+	// Disable FEC for 100G-FR ports because Novus does not support it.
+	p100gbasefr := []string{}
+	for _, p := range tc.atePorts {
+		if p.PMD() == ondatra.PMD100GBASEFR {
+			p100gbasefr = append(p100gbasefr, p.ID())
+		}
+	}
+
+	if len(p100gbasefr) > 0 {
+		l1Settings := tc.top.Layer1().Add().SetName("L1").SetPortNames(p100gbasefr)
+		l1Settings.SetAutoNegotiate(true).SetIeeeMediaDefaults(false).SetSpeed("speed_100_gbps")
+		autoNegotiate := l1Settings.AutoNegotiation()
+		autoNegotiate.SetRsFec(false)
+	}
+
 	dstDev := tc.top.Devices().Add().SetName(agg.Name())
 	dstEth := dstDev.Ethernets().Add().SetName(ateDst.Name + ".Eth").SetMac(ateDst.MAC)
 	dstEth.Connection().SetLagName(agg.Name())