Brocade Communications Systems Brocade ICX 6650 - Manual (Page 55)

Brocade ICX 6650 Administration Guide 37
53-1002600-01
Basic port parameter configuration
2
Displaying flow-control status
The show interface // command displays configuration, operation, and
negotiation status where applicable.
For example, issuing the command for 10/100/1000M port 1/1/36 displays the following output.
Brocade# show interfaces ethernet 1/1/36
10GigabitEthernet1/1/36 is up, line protocol is up
Hardware is 10GigabitEthernet, address is 748e.f80c.5f40 (bia 748e.f80c.5f40)
Interface type is 10Gig SFP+
Configured speed 10Gbit, actual 10Gbit, configured duplex fdx, actual fdx
Member of L2 VLAN ID 1, port is untagged, port state is FORWARDING
BPDU guard is Disabled, ROOT protect is Disabled
Link Error Dampening is Disabled
STP configured to ON, priority is level0, mac-learning is enabled
Flow Control is enabled
Mirror disabled, Monitor disabled
Not member of any active trunks
Not member of any configured trunks
No port name
MTU 10200 bytes, encapsulation ethernet
300 second input rate: 0 bits/sec, 0 packets/sec, 0.00% utilization
300 second output rate: 96 bits/sec, 0 packets/sec, 0.00% utilization
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 multicasts, 0 unicasts
0 input errors, 0 CRC, 0 frame, 0 ignored
0 runts, 0 giants
1 packets output, 64 bytes, 0 underruns
Transmitted 0 broadcasts, 1 multicasts, 0 unicasts
0 output errors, 0 collisions
Relay Agent Information option: Disabled
Egress queues:
Queue counters Queued packets Dropped Packets
0 0 0
1 0 0
2 0 0
3 0 0
4 0 0
5 0 0
6 0 0
7 0 0
Symmetric flow control on Brocade ICX 6650 devices
In addition to asymmetric flow control, Brocade ICX 6650 devices support symmetric flow control,
meaning they can both receive and transmit 802.3x PAUSE frames.
By default on Brocade ICX 6650 devices, packets are dropped from the end of the queue at the
egress port (tail drop mode), when the maximum queue limit is reached. Conversely, when
symmetric flow control is enabled, packets are guaranteed delivery since they are managed at the
ingress port and no packets are dropped.
Symmetric flow control addresses the requirements of a lossless service class in an Internet Small
Computer System Interface (iSCSI) environment.