Users Guide

reduces the buer usage. When the buer usage drops by the value specied in the “resume-threshold”, the port
again sends a PAUSE frame with 0 as wait-time. This results in resume of the paused trac ow.
Important Points to Remember
• Do not enable tx pause when buer carving is enabled. For information and assistance, consult Dell
Networking TAC.
• The only conguration 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 congured when the ow control conguration 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 ow control must be o (rx off tx off) before conguring the half duplex.
• Speeds less than one Gig cannot be congured when the asymmetric ow control conguration is on. The
following error is returned:
Can’t configure speed <1G when Asymmetric flowcontrol is on, config ignored
• Dell 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 Networking recommends
rebooting the system.
NOTE: Dell Networking OS does not support mirroring of tx pause frames.
Example
Dell(conf-if-Te-1/1/1)# show config
!
interface TenGigabitEthernet 1/1/1
no ip address
switchport
no negotiation auto
flowcontrol rx off tx on
no shutdown
...
Example (Monitor
Session)
Dell(conf-if-te-1/1/1)#show config
!
interface TenGigabitEthernet 1/1/1
no ip address
shutdown
flowcontrol monitor 5
Example (Values)
This Example shows how Dell Networking OS negotiates the ow control values between two Dell 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
off on
on off
668 Interfaces