3Com S7902E, Руководство по настройке

Страница: 49 / 2621

1-9
To do… Use the command… Remarks
interface interface-type
interface-number
Configure the interval for
collecting port statistics
flow-interval interval
Optional
By default, the interval for
collecting port statistics is 300
seconds.
Enabling Forwarding of Jumbo Frames
Due to tremendous amount of traffic occurring on an Ethernet port, it is likely that some frames greater
than the standard Ethernet frame size are received. Such frames (called jumbo frames) will be dropped.
With forwarding of jumbo frames enabled, the system does not drop all the jumbo frames. Instead, it
continues to process jumbo frames with a size greater than the standard Ethernet frame size and yet
within the specified parameter range.
In port configuration mode (Ethernet port view/port-group view), you can set the length of jumbo frames
that can pass through the Ethernet port.
z
If you execute the command in Ethernet port view, the configurations take effect only on the current
port.
z
If you execute the command in port-group view, the configurations take effect on all ports in the port
group.
Follow these steps to enable the forwarding of jumbo frames:
To do… Use the command… Remarks
Enter system view system-view —
port-group manual
port-group-name
In port-group view
jumboframe enable [ value ]
interface interface-type
interface-number
Enable the
forwarding
of jumbo
frames
In Ethernet port
view
jumboframe enable [ value ]
Use any command.
By default, the device
allows jumbo frames with
the specified length to
pass through all Ethernet
ports. The default length of
jumbo frames that are
allowed to pass is 1536
bytes.
If you set the value argument for ports of a port group in Ethernet port view or port-group view for
multiple times, the latest configuration takes effect.
Enabling Loopback Detection on an Ethernet Port
If a port receives a packet that it sent out, a loop occurs. Loops may cause broadcast storms. The
purpose of loopback detection is to detect loops on a port. When loopback detection is enabled on an
Ethernet port, the device periodically checks for loops on the port. If a loop is detected on the port, the
device operates on the port according to the pre-configured loopback detection actions, and sends a
trap message to the terminal.