Forward Error Correction (Fec) Mode - Brocade Communications Systems MLX Series Hardware Installation Manual

Module configuration: System > Module > Add Module
The GUI will add a new module from the selection menu using the following label:
This new selection allows the configuration of the BR-MLX-40GX4-M 4-port 40GbE module.
Module display configuration: System > Module
The GUI will be modified to display a slot that has the configured 4x40GbE card.
Port Display configuration: Port > Ethernet Port Attribute
The GUI will be modified to display the appropriate optic type for 40GigE ports.
NOTE
Optics supported: 40G-QSFP-SR4 for 100M and 40G-QSFP-LR4 for 10KM.
NOTE
Safety requirements are the same as MLX 24x10G.

Forward Error Correction (FEC) mode

Using Forward Error Correction (FEC) mode enabled modules on a Brocade MLXe series chassis will
reduce packet drops due to CRC errors. FEC will automatically be enabled on supported line cards
and fabric links in a Brocade MLXe series chassis.
Forward Error Correction (FEC) mode is applicable for the Brocade MLXe series platforms. It will be
operational on the 16Ke chassis and 32Ke chassis for the following cards:
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•
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FEC mode is applied on a per link basis. Both sides of the link (TM side and FE side) must be in the
same mode. In a Brocade MLXe series chassis, the following applies:
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Forward Error Correction (FEC) on Backplane Serdes Links
The operating margin of the longer backplane traces in the Brocade MLXe series 16Ke and 32Ke
chassis may be reduced due to signal attenuation. In the normal coding scheme (8b/10b), CRC
errors are detected and the corrupt packets are dropped. With FEC enabled on the serdes links,
single burst errors can be corrected on the fly so packet drops are avoided.
Line Module Shutdown
Line Module Shutdown is an RAS feature that improves reliability of the XMR/MLX chassis. The LP
card is shutdown when both MPs are down or MP's are disconnected from the chassis. L2 and L3
traffic is stopped, and the router stops forwarding all traffic. Hardware flooding and dropping
control traffic required for processing by the router is thereby avoided.
Brocade MLX Series and NetIron XMR Hardware Installation Guide
53-1003821-01
BR-MLX-40GX4-M 4-port 40GbE Module
2x100G
24x10G
4x40G
hSFMs (FE600 based SFMs)
All fabric facing links on the 4x40G, 2x100G and 24x10G TMs will have FEC enabled
hSFM links connected to 4x40G, 2x100 and 24x10 will have FEC enabled
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Router modules
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