Technical data

16 Brocade 6910 Ethernet Access Switch Diagnostic Guide
53-1002348-02
Ethernet diagnostics
show interfaces switchport ethernet
Syntax: show interfaces switchport ethernet unit/port
unit - Unit identifier. (Range: 1)
port - Port number. (Range: 1-12)
This command displays the administrative and operational status for Ethernet ports, as shown in
the following example.
Console# show interfaces switchport ethernet 1/1
Information of Eth 1/1
Broadcast Threshold : Enabled, 64 Kbits/second
Multicast Threshold : Disabled
Unknown Unicast Threshold : Disabled
LACP Status : Disabled
Ingress Rate Limit : Disabled, 64 Kbits per second
Egress Rate Limit : Disabled, 1000000 Kbits per second
VLAN Membership Mode : Hybrid
Ingress Rule : Disabled
Acceptable Frame Type : All frames
Native VLAN : 1
Priority for Untagged Traffic : 0
GVRP Status : Disabled
Allowed VLAN : 1(u)
Forbidden VLAN :
802.1Q Tunnel Status : Disabled
802.1Q Tunnel Mode : Normal
802.1Q Tunnel TPID : 8100 (Hex)
Layer 2 Protocol Tunnel : None
Common diagnostic scenarios
The following issues can occur with Ethernet interfaces:
• Faulty hardware
Whenever you encounter a connection problem, check for faulty hardware. Replace cables, try
another port, and check all cable connections. If you find a faulty port, contact Brocade
Technical Support for assistance.
• Link failures
Link failures can be due to a failure of the transmission medium or of the devices at each end
of a connection. Be sure to check all of the hardware involved in the link, including cables and
ports.
• CSMA/CD
The Carrier Sense Multiple Access (CSMA) with Collision Detection (CD) protocol controls
access to shared Ethernet media. A switched network (for example, Fast Ethernet) may use a
full-duplex mode with access to the full link speed between directly connected network
interface cards (NICs), switch-to-NIC cables, or switch-to-switch cables.
• CRC errors
The Cyclic Redundancy Check (CRC) length specifies whether the CRC portion of each frame
transmitted on the interface is 16 bits or 32 bits long. The default is 32 bits.