Araknis Spanning Tree CIST
This was highlighted by a SnapOne TierII engineer, which we have summarised into the below information.
Enabling Spanning Tree protocol is fine, but you aren't telling the switch what ports need to participate in the Spanning Tree.
In the STP menu in the Araknis 210/310 switch, is an option of CIST.
If EdgePort in CIST, is set to Yes, the port does NOT participate in the Spanning Tree calculations. So when a workstation, server, general network host or laptop is connected to a switch, that is an edge port, because that work station, has no other route back to the network.
Whereas, switch to switch, or switch to Sonos/Sky, or any device that is known to cause a Spanning Tree Loop, should be set to NO, then BPDU guard will listen for loops on that port.
The information has been copied from the CIST section of the manual.
- Priority – Set CIST priority for each port on the switch. Smaller values indicate higher priority; larger
values, lower priority. If all ports have the same path cost, this value will be used to determine the best
path to the root bridge. Range: 0-240 (multiples of 16)
Default: 128
- Path Cost Conf / Oper – (Configured/Operating) Enter a value larger than zero to modify the path cost.
The currently calculated (Oper) path cost is displayed below. If the entered value is zero, the Oper path
cost is based on the port speed, which in this case is 1 Gbps.
- Designated Root Bridge – Displays the designated root bridge device’s priority, forward delay, and MAC
address.
- External Root Cost – Displays the cost to reach the root bridge across links connecting the boundary
ports outside the MSTP region. When a BPDU is received on an internal port, this cost is not changed.
When a BPDU is received on a boundary port, this cost is adjusted based on the receiving boundary port
cost.
- Regional Root Bridge – Displays the regional root bridge device’s priority, forward delay, and MAC
address.
- Internal Root Cost – Displays the cost to reach the regional root bridge inside the MSTP region. When
a BPDU is received on an internal port, this cost is adjusted based on the receiving boundary port cost.
This information is not shared or counted outside the region.
- Designated Bridge – Displays the designated bridge device’s priority, forward delay, and MAC address.
- Edge Port Conf / Oper – (Configured/Operating) Configure a switch port as an edge port for a region
and see the current edge status of the port.
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