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--- cisco:switch:9500:cisco_catalyst_9500_series_manual [2025/02/12 13:56] – aperez
+++ cisco:switch:9500:cisco_catalyst_9500_series_manual [2025/02/24 09:43] (current) – aperez
@@ Line 584: / Line 584: @@
   no spanning-tree vlan 527
+----
+----
+**FEC** on an SFP port refers to **Forward Error Correction (FEC)**, which is a technique used in fiber optic and Ethernet networks to enhance data transmission reliability by detecting and correcting errors without the need for retransmission.
+**FEC (Forward Error Correction)**:
+FEC is a mechanism that adds redundant information to the transmitted data. This redundancy allows the receiving end to detect and correct errors caused by signal degradation or noise during transmission.
+Purpose: FEC is essential for high-speed data links (e.g., 10G, 25G, 40G, 100G Ethernet) to improve link quality and performance.
+Types: Different FEC modes can be used depending on the standard and speed of the connection (e.g., Reed-Solomon FEC).
+  *   **auto**   Enable FEC Auto-Neg
+  *   **cl108**  Enable clause108 with 25G
+  *   **cl74**   Enable clause74 with 25G
+  *   **off**    Turn FEC off, FEC is mandatory for speeds 50G or higher
+----
+----
+**Benefits of FEC on SFP Ports**:
+  * Error Correction: FEC can correct errors due to signal attenuation or interference.
+  * Better Link Performance: Allows for longer cable runs or higher speeds by improving signal integrity.
+  * No Retransmissions: Unlike other error correction methods, FEC works proactively without needing retransmissions, which is important for low-latency environments.
+----
+**C9500 Cisco Catalyst**
+C9500-N#**show ver**
+  Cisco IOS XE Software, **Version 17.12.03**
+  Cisco IOS Software [Dublin], Catalyst L3 Switch Software (CAT9K_IOSXE), Version 17.12.3, RELEASE SOFTWARE (fc7)
+  interface TwentyFiveGigE1/0/3
+   description VLAN 526 PTP A.B.C.D/EF X30
+   switchport access vlan 526
+   switchport mode access
+   mtu 9100
+   logging event trunk-status
+   logging event bundle-status
+   udld port aggressive
+   fec cl74
+  C9500-N(config-if)#interface TwentyFiveGigE1/0/3
+  C9500-N(config-if)#fec ?
+    auto   Enable FEC Auto-Neg
+    cl108  Enable clause108 with 25G
+    cl74   Enable clause74 with 25G
+    off    Turn FEC off, FEC is mandatory for speeds 50G or higher
+----
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