Functions
Spanning Tree Protocol
2.19.14 Assigning VLANs to Multiple Spanning Tree Instances
VLANs have to be explicitly assigned to MSTIs with a command. The range of valid MSTIDs is
1-4094. Per device up to 4 MSTIs can be defined (with arbitrary MSTID). Initially, all VLANs are
assigned to the CIST (Common and Internal Spanning Tree).
Commands for assigning VLANs to Multiple Spanning Tree instances
< s e t s t p m s t i { 1 - 4 0 9 4 } v l a n { 1 - 4 0 9 4 } >
< s e t s t p m s t i { 1 - 4 0 9 4 } n o v l a n { 1 - 4 0 9 4 } >
2.19.15 Advice on the Operation of Spanning Tree with EDS500 Devices
The default value for Spanning Tree is enable.
As a rule of thumb there is no further configuration required. Some general points should be
considered for the planning and creation of the configuration.
It is advisable to position the Root Bridge at a defined place in the network. Usually, this is
close to the uplink of a network. Depending on the topology it is reasonable to define a fall-
back Root Bridge. A device is selected as root bridge by setting a better (i.e. lower) priority
(example: <set stp priority bridge 24576>).
Ports, that are no edge ports and are directly connected to another STP capable device the
property should be set to point-to-point mode. This is particularly advisable for optical fibre
rings. (example: <set stp point-to-point fo1>).
The default value for Ethernet ports (optical fibres as well as copper) is: no point-to-point.
If, for redundant paths, particular ports should get priority then the port priority should be
set accordingly. The port cost should not be adapted or if only to a small extent as these
values get summed up and are distributed via STP BPDUs and should therefore represent the
real conditions as much as possible. Ideally, you leave the calculation of costs to the device.
Exception: the device cannot detect the speed automatically for the virtual port tunnel0, so
you should set the port costs to an estimated value.
Interface speed
Default value
Recommended range
≤ 100 kbps
200 000 000
20 000 000 – 200 000 000
20 000 000
2 000 000 – 200 000 000
10 Mbps
2 000 000
200,000 – 20,000,000
100 Mbps
200 000
20,000 – 2,000,000
1 Gbps
20 000
2,000 – 200,000
Table 24: Spanning Tree port cost
2.20 Serial Interfaces
The serial interfaces of EDS500 devices are laid out as RJ-12 plugs (6P6C) (see EDS500
Manual - Part 1: Serial Interfaces (Con0 - Con1)).
The default value for the behaviour of the interfaces is according to ITU-T V.24 / EIA RS-232.
Depending on the device switch-over to EIA RS-422/485 is possible.
The default values for the serial interfaces are:
•
Baud rate 57600 Baud
1KGT151021
V000 1
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