Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 705)

18.Use the following syntax of the username command to reset passwords for the admin or user
accounts, or for any other nondefault users.
username account-name password new-password
The following example resets the admin password to the default value of "password."
switch(config)# username admin password password
19.To restore the nondefault user accounts, perform the following steps:
a) Copy the running-config to a file.
switch: copy running-config flash://running-config.cfg
2012/07/09-11:51:21, [DCM-1108], 4930, M2, INFO, VDX8770-4, Running
configuration file has been uploaded successfully to the remote location.
b) Copy the default-config to the startup-config, to reset the startup-config.
switch# copy default-config startup-config
c) Reboot the switch.
switch# reload
Warning: Unsaved configuration will be lost. Please run ’copy
running-config startup-config’ to save the
current configuration if not done already.
Are you sure you want to reload the switch? [y/n]:y
The system is going down for reload NOW !!
d) Copy the file saved in Step 19a to the running-config.
switch# copy flash://running-config.cfg running-config
Loading.
2012/07/09-12:08:13, [DCM-1105], 5456, M2, INFO, VDX8770-4, Copy of the
downloaded config file to the current running-config has completed
successfully on this node.
e) Copy the running-config to the startup-config.
switch# copy running-config startup-config
The password recovery procedure is now complete. You can now use normal password-management
procedures from the admin account.
Ping fails
If pings do not successfully traverse the switch, try the following operations.
1. Trace the packet flow and check whether ARP or ICMP packets are getting dropped.
2. Trace which direction is failing by using interface statistics.
3. Locate the device that is dropping the packets.
4. Look for any error counters incrementing on that device.
5. Check the MAC address table to determine whether the MAC addresses are learned on the correct
port or port-channel.
QoS configuration causes tail drops
Tail-drop queueing is the most basic form of congestion control. Normal operation is first-in, first-out
(FIFO) until all buffers are exhausted. After that, new frames are dropped. You can reduce the impact of
such drops by configuring thresholds for each C0S priority through the qos rcv-queue multicast
threshold command. Refer to
Configuring QoS on page 471.
QoS is not marking or treating packets correctly
Use the Switched Port Analyzer (SPAN) feature to mirror the ingress and egress ports to check that
QoS is marking and treating packets correctly. Refer to
Configuring Switched Port Analyzer on page
533 for details.
Ping fails
Network OS Administrator’s Guide 705
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