Service Manual

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
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 1 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 Networking OS only supports rx on tx on and rx off tx off for speeds less than 1 Gig (Symmetric).
NOTE: If you use the disable rx flow control command, Dell Networking recommends rebooting the
system.
Example
Dell(conf-if-Te-1/1)#show config
!
interface TenGigabitEthernet 1/1
no ip address
switchport
no negotiation auto
flowcontrol rx off tx on
no shutdown
...
Example (Values)
This Example shows how Dell Networking OS negotiates the flow 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
on on
on on off off
off on
on off
Interfaces
785