25
Solution
To resolve the issue:
1.
Verify that the speed and duplex mode of the local port match the speed and duplex mode of
the peer port:
a.
Execute the
display interface brief
command to examine whether the speed and duplex
mode of the port match the speed and duplex mode of the peer port.
b.
If they do not match, use the
speed
command and the
duplex
command to set the rate and
duplex mode for the port.
2.
Verify that the speed and duplex mode of the local port match the speed and duplex mode of
the transceiver module:
a.
Execute the
display interface brief
command to examine whether the speed and duplex
mode of the port match the speed and duplex mode of the transceiver module.
b.
If they do not match, use the
speed
command and the
duplex
command to set the rate and
duplex mode for the port.
25-GE ports can operate at 25 Gbps, 10 Gbps, or 1 Gbps. For a 25-GE port on an S6850 or
S9850 switch to operate at 10 Gbps or 1 Gbps, you must use the
speed
command to specify
that speed for the port. For the port to come up, the speed configured for the port must be the
same as the speed of the transceiver module or cable installed in the port. 25-GE ports on an
S6825 switch can operate at 10 Gbps or 1 Gbps without using the
speed
command. 25-GE
breakout ports can operate at only 25 Gbps.
Ports in the same group must have the same speed settings. When you modify the speed of a
port in a group, the modification takes effect on all ports in the group. When you use the
default
command to restore the default settings for a port in a group, the speed will be restored to the
default for the port and the other ports in the group.
25-GE ports on the S6850&S9850 switches are grouped as follows:
For ports 1 through 24 and 33 through 56 on an S6850-56HF switch, four continuous ports
starting from 1 or 33 are organized into one group.
For ports on an LSWM124TG2H interface card, four continuous ports starting from 1 are
organized into one group.
When you use the
using twenty-fivegige
command to split a 100-GE port into four 25-GE
breakout ports, the four breakout ports are organized into one group.
To use autonegotiation for 25-GE ports, follow these restrictions and guidelines:
To use an SFP28 copper cable to connect an SFP28 port on an S6850-56HF or
S6825-54HF switch to a peer port, use the
speed
,
duplex full
, and
port fec mode
command to configure the speed, full duplex mode, and a non-auto FEC mode for the port if
the peer port does not support autonegotiation. For the port to come up, make sure the
configured speed for the port is consistent with that of the transceiver module/cable installed
in it.
To use an SFP+ transceiver module/cable to connect an SFP28 port on an S6850-56HF
switch to a peer port, you must configure the
speed 10000
command for the port so that it
can come up.
The SFP28 ports on an LSWM124TG2H do not support autonegotiation. To use an SFP28
copper cable to connect an SFP28 port, disable autonegotiation on the peer port. To use an
SFP+ transceiver module/cable to connect an SFP28 port, configure the
speed 10000
command for the port so that the port can come up.
To use another type of SFP transceiver module than the SFP-GE-T or SFP-GE-T-D to
connect an SFP28 port, disable autonegotiation on the peer port.
3.
Verify that the status of link compensation (also known as training) and FEC protocols is the
same as the peer port.
