Administrator Guide

the traffic. Eventually this reduces the buffer usage. When the buffer usage drops by the value specified
in the “resume-threshold”, the port again sends a PAUSE frame with 0 as wait-time. This results in
resume of the paused traffic flow.
Important Points to Remember
● Do not enable tx pause when buffer carving is enabled. For information and assistance, consult Dell
EMC Networking TAC.
● The only configuration applicable to half duplex ports is rx off tx off. The following error is
returned:
Can’t configure flowcontrol when half duplex is configure, config ignored
● Half duplex cannot be configured when the flow control configuration is on (default is rx on tx
on). The following error is returned:
Can’t configure half duplex when flowcontrol is on, config ignored
NOTE: The flow control must be off (rx off tx off) before configuring the half duplex.
● Speeds less than one Gig cannot be configured when the asymmetric flow control configuration is on.
The following error is returned:
Can’t configure speed <1G when Asymmetric flowcontrol is on, config
ignored
● Dell EMC Networking OS only supports rx on tx on and rx off tx off for speeds less than
one Gig (Symmetric).
NOTE:
If you use the disable rx flow control command, Dell EMC Networking recommends
rebooting the system.
NOTE: Dell EMC Networking OS does not support mirroring of tx pause frames.
Example
DellEMC(conf-if-Te-1/1/1/1)# show config
!
interface TenGigabitEthernet 1/1/1/1
no ip address
switchport
no negotiation auto
flowcontrol rx off tx on
no shutdown
...
Example
(Monitor
Session)
DellEMC(conf-if-te-1/1/1/1)#show config
!
interface TenGigabitEthernet 1/1/1/1
no ip address
shutdown
flowcontrol monitor 5
Example (Values)
This Example shows how Dell EMC Networking OS negotiates the flow control values between two Dell
EMC Networking chassis connected back-to-back using 1G copper ports.
Configured
LocRxConf LocTxConf RemoteRxConf RemoteTxConf
off off off off
off on
on off
on on
off on off off
off on
on off
on on
on off off off
Interfaces 663