Enabling Pause Frames; Configure The Mtu Size On An Interface - Dell C9000 Series Networking Configuration Manual

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Enabling Pause Frames

Enable Ethernet pause frames flow control on all ports on a chassis or a line card. If not, the system may
exhibit unpredictable behavior.
NOTE:
Changes in the flow-control values may not be reflected automatically in the show interface
output. As a workaround, apply the new settings, execute shut then no shut on the interface, and then
check the running-config of the port.
NOTE:
If you disable rx flow control, Dell Networking recommends rebooting the system.
The flow control sender and receiver must be on the same port-pipe. Flow control is not supported across
different port-pipes.
To enable pause frames, use the following command.
Control how the system responds to and generates 802.3x pause frames on 10 Gigabit line cards.
INTERFACE mode
flowcontrol rx [off | on] tx [off | on] [threshold {<1-2047> <1-2013> <1-2013>}]
rx on: enter the keywords rx on to process the received flow control frames on this port.
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.
threshold: when you configure tx on, you can set the threshold values for:
Number of flow-control packet pointers: the range is from 1 to 2047 (default = 75).
Flow-control buffer threshold in KB: the range is from 1 to 2013 (default = 49KB).
Flow-control discard threshold in KB: the range is from 1 to 2013 (default= 75KB)
Pause control is triggered when either the flow control buffer threshold or flow control packet pointer
threshold is reached.

Configure the MTU Size on an Interface

If a packet includes a Layer 2 header, the difference in bytes between the link MTU and IP MTU must be
enough to include the Layer 2 header.
For example, for VLAN packets, if the IP MTU is 1400, the Link MTU must be no less than 1422:
1400-byte IP MTU + 22-byte VLAN Tag = 1422-byte link MTU
The MTU range is from 594 to 12000, with a default of 1554 IP MTU automatically configures.
The following table lists the various Layer 2 overheads in the Dell Networking OS and the number of bytes.
Interfaces
539

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