Hitachi US7070447-001 User Manual
HiSpeed Switch Troubleshooting Guide
7-4
US7070447-001, Rev 01
Draft Level—Hitachi Confidential
Problem:
After rebooting my PC, I cannot log onto my Novell or DHCP server.
Solution:
PCs equipped with faster processors will boot up before STA on the
switch has completely stabilized. Because the ports on the switch have
not gone to ‘Forwarding’, applications on the PCs may have timed out
when trying to connect to the server.
To disable Spanning Tree on the switch, type
switch has completely stabilized. Because the ports on the switch have
not gone to ‘Forwarding’, applications on the PCs may have timed out
when trying to connect to the server.
To disable Spanning Tree on the switch, type
/VBRIDGE/CONFIG/bridge <vlan#>, select option 1
To reduce the STA timer, type
/VBRIDGE/CONFIG/bridge <vlan#>, select option 5
Problem:
The switch is constantly flooding the network with broadcast traffic.
How can I control the amount of broadcast on my network?
How can I control the amount of broadcast on my network?
Solution:
By design, a bridge will forward all broadcast traffic. However, if the
switch is specifically broadcasting ‘Unknown Unicast’ packets, verify
that DLF is enabled. The Destination Lookup Failure (DLF) mechanism
slows down broadcasts sent from the CPU which may eventually
consume total bandwidth on the network. By default, DLF is enabled. To
enable/disable DLF on the switch, type
switch is specifically broadcasting ‘Unknown Unicast’ packets, verify
that DLF is enabled. The Destination Lookup Failure (DLF) mechanism
slows down broadcasts sent from the CPU which may eventually
consume total bandwidth on the network. By default, DLF is enabled. To
enable/disable DLF on the switch, type
/VBRIDGE/CONFIG >throttle
If you have redundant bridge paths on your network, verify that STA is
enabled and ports are in a forwarding/blocking state
enabled and ports are in a forwarding/blocking state
/VBRIDGE/SHOW > bridge <vlan#>
/VBRIDGE/SHOW > port <vlan#>
Note:
Not recommended if there are redundant bridge paths resulting
in loops on your network.
Note:
Ensure that STA timers are set to be the same on all bridges. If
BPDUs are transmitted at different time intervals, this may result in an
unstable network (state of flux).
unstable network (state of flux).