xStack DES-6500 Modular Layer 3 Chassis Ethernet Switch User Manual
Max Age
The
Max Age
may be set to ensure that old information does not endlessly circulate through
redundant paths in the network, preventing the effective propagation of the new information.
Set by the Root Bridge, this value will aid in determining that the Switch has spanning tree
configuration values consistent with other devices on the bridged LAN. If the value ages out
and a BPDU has still not been received from the Root Bridge, the Switch will start sending its
own BPDU to all other switches for permission to become the Root Bridge. If it turns out that
your switch has the lowest Bridge Identifier, it will become the Root Bridge. The user may
choose a time between 6 and 40 seconds. The default value is 20.
Forward Delay
The
Forward Delay
can be from 4 to 30 seconds. Any port on the Switch spends this time in
the listening state while moving from the blocking state to the forwarding state.
Max Hops
Used to set the number of hops between devices in a spanning tree region before the BPDU
(bridge protocol data unit) packet sent by the Switch will be discarded. Each switch on the
hop count will reduce the hop count by one until the value reaches zero. The Switch will then
discard the BPDU packet and the information held for the port will age out. The user may set
a hop count from 1 to 20. The default is 20.
TX Hold Count
Used to set the maximum number of Hello packets transmitted per interval. The count can be
specified from 1 to 10. The default is 3.
Forwarding BPDU
This field can be
Enabled
or
Disabled.
When
Enabled,
it allows the forwarding of STP BPDU
packets from other network devices. The default is Enabled.
Loopback Detection
This feature is used to temporarily block STP on the Switch when a BPDU packet has been
looped back to the switch. When the Switch detects its own BPDU packet coming back, it
signifies a loop on the network. STP will automatically be blocked and an alert will be sent to
the administrator. The LBD STP port will restart (change to discarding state) when the
LBD
Recover Timer
times out. The user may enable or disable this function using the pull-down
menu. The default is Enabled.
LBD Recover Timer
This field will set the time the STP port will wait before recovering the STP state set. 0 will
denote that the LBD will never time out or restart until the administrator personally changes
it. The user may also set a time between 60 and 1000000 seconds. The default is 60
seconds.
Click
Apply
to implement changes made.
NOTE:
The Hello Time cannot be longer than the Max. Age. Otherwise, a
configuration error will occur. Observe the following formulas when setting
the above parameters:
Max. Age
≤
2 x (Forward Delay - 1 second)
Max. Age
≥
2 x (Hello Time + 1 second)
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