SAF FreeMile, User Manual

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The SAF FreeMile Series Full Outdoor Unit Technical Description and Configuration Guide • Rev. 1.3
© SAF Tehnika JSC 2012
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4.7 Spanning Tree Configuration
Implementation of 802.1D ‐ 2004 RSTP (Rapid Spanning Tree Protocol) is backwards
compatible with STP, as well as having additional capability for automatic WAN port Path Cost
calculation and non ‐ standard mode for faster network convergence.
4.7.1 Spanning Tree Configuration
Figure 4.32. Spanning Tree Protocol configuration
Bridge configuration ‐ Values 2 ‐ 4 take effect only if a given Bridge is Root:
1. Bridge ID – value from (0..61440) ; this parameter and MAC address determine
whether a given Bridge is Root Bridge. Advantage is given to the combination of
Priority and Address , which is numerically smaller;
2. Hello Time (1..100) – time gap, between which the BPDU packets are being sent;
3. Max Age (6..40) – this parameter determines time period, during which the
received BPDU packets’ information is stored for a separate port;
4. Forward Delay (4..30) – time period that determines time a separate port stays in
Listening and Learning conditions;
5. Version – allows choosing STP version. In STP Compatibility mode the Spanning tree
is compatible with STP devices and in RSTP mode the tree is compatible with RSTP
devices
6. STP operation – enables or disables STP functionality. In “Disabled” mode the switch
passes through BPDU (Bridge Protocol Data Unit) packets.
Root information – displays the data only when STP/RSTP is enabled:
7. Root ID – displays the Bridge ID of current Root bridge;
8. Hello Time – displays the current hello time;
9. Max Age – displays the current max age;
10. Forward Delay – displays the current forward delay;
11. Root Port – currently elected root port is being shown;
12. Root Path Cost – displays the path cost from current bridge to root bridge;
13. Port 1 LAN – STP parameters of LAN port;
14. Port 2 WAN – STP parameters of WAN port:
- Priority (0..240) – Port Priority. Combination of Priority, Port number and Path Cost
determines whether the port will be selected as Root port or will be blocked on the
occasion of loop, etc;