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PowerConnect B-Series FCX Configuration Guide 331
53-1002266-01
Jumbo frame support
9
PowerConnect(config)#interface e 1/1
PowerConnect(config-if-e1000-1/1)#link-fault-signal
Syntax: [no] link-fault-signal
Use the no form of the command to disable LFS.
LFS is OFF by default.
Viewing the status of LFS-enabled links
The status of an LFS-enabled link is shown in the output of the show interface and show interface
brief commands, as shown in the following examples.
The bold text in the above output shows that the LFS-enabled link (port 10/1) is down because of
an error on the remote port, as indicated by remote fault.
Syntax: show interface ethernet <port>
Specify the <port> variable in the following formats:
• PowerConnect B-Series FCX stackable switches – <stack-unit/slotnum/portnum>
.
The bold text in the above output indicates that there is an error on the LFS-enabled link on port
10/1 and the link is down.
Syntax: show interfaces brief
Jumbo frame support
Ethernet traffic moves in units called frames. The maximum size of frames is called the Maximum
Transmission Unit (MTU). When a network device receives a frame larger than its MTU, the data is
either fragmented or dropped. Historically, Ethernet has a maximum frame size of 1500 bytes, so
most devices use 1500 as their default MTU.
Jumbo frames are Ethernet frames with more than 1,500 bytes MTU. Conventionally, jumbo
frames can carry up to 9,000 bytes MTU. Dell PowerConnect devices support Layer 2 jumbo frames
on 10/100, 100/100/1000, and 10GbE ports.
PowerConnect#show interface e 10/1
10GigabitEthernet10/1 is down (remote fault), line protocol is down
Hardware is 10GigabitEthernet, address is 0012.f227.79d8 (bia 0012.f227.79d8)
Configured speed 10Gbit, actual unknown, configured duplex fdx, actual unknown
Member of L2 VLAN ID 1, port is untagged, port state is BLOCKING
BPDU guard is Disabled, ROOT protect is Disabled
Link Fault Signaling is Enabled, Link Error Dampening is Disabled
STP configured to ON, priority is level0
Flow Control is disabled
mirror disabled, monitor disabled
some lines omitted for brevity...
PowerConnect#show interfaces brief
Port Link State Dupl Speed Trunk Tag Pvid Pri MAC Name
10/1 Err-LFS None None None None No 1 0 0012.f227.79d8