Administrator Guide

Version Description
9.12(0.0) Enabled on 25G and 50G interfaces on the Z9100–ON by default. Introduced support to
enable or disable FEC independent of autonegotiation for 100G interfaces on the S6100–
ON and Z9100–ON.
9.10(0.0) Introduced on the S6100–ON.
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
Usage Information
This command is not applicable for 10–Gigabit and 40–Gigabit Ethernet interfaces.
The fec enable command enables Clause 91 error correction on 100G interfaces.
You can enable or disable FEC and auto negotiation irrespective of each other on 100G interfaces.
For 100G interfaces, CR4 auto-negotiation is enabled based on the media type. Autonegotiation is enabled on DAC
cables by default.
For 25–Gigabit and 50–Gigabit Ethernet interfaces, There is no support for CL73-AN (auto negotiation), CL72-LT
(link training), and CL74-FEC (BaseR-FEC or firecode-FEC).
Related
Commands
fec default — sets the FEC to default value.show config — displays the interface configuration.
flowcontrol
Control how the system responds to and generates 802.3x pause flow control frames.
Syntax
flowcontrol {rx {off | on} tx {off | on} [negotiate | pause-threshold value |
resume-offset value] | [monitor session-ID]}
To return to the default, use the no form of this command.
Parameters
rx on Enter the keywords rx on to process the received flow control frames on this port.
NOTE: Flow-control packets are mirrored only when flow-control rx is
enabled on an interface.
rx off Enter the keywords rx off to ignore the received flow control frames on this port.
tx on Enter the keywords tx on to send control frames from this port to the connected
device when a higher rate of traffic is received.
tx off Enter the keywords tx off so that flow control frames are not sent from this port to
the connected device when a higher rate of traffic is received.
pause-threshold Enter the buffer threshold limit for generating PAUSE frames.
resume-offset Enter the offset value for generating PAUSE frames to resume traffic.
negotiate (Optional) Enter the keyword negotiate to enable the pause-negotiation with the
egress port of the peer device. If the negotiate command is not used, pause-
negotiation is disabled. 40-gigabit Ethernet interfaces do not support pause-negotiation
640 Interfaces