Spanning Tree Port Cost; 2.19.10 Spanning Tree Point-To-Point Port Property - ABB EDS500 Series Function Manual

Functions
< s e t s t p m s t i { 1 - 4 0 9 4 } p r i o r i t y { b a c k u p - g r o u p 1 | c h a n n e l 0
| d s l 1 | d s l 2 | f a s t e t h e r n e t 0 | f o 1 | f o 2 | p o r t 1 | p o r t 2 |
p o r t 3 | p o r t 4 | t u n n e l 0 } { 0 - 2 4 0 } >
2.19.9

Spanning Tree Port Cost

The port cost determine the selection of the preferred root path and should ideally represent
the actual transmission conditions.
The default value for all ports is auto.
This means that the device sets the negotiated or set data rate automatically per port. In a
few cases (example: transmission via port tunnel0 with a L2TP tunnel through a VPN network)
the effective data rate cannot be determined automatically and a manual settings should be
used.
Commands to configure the spanning tree port costs
< s e t s t p c o s t { b a c k u p - g r o u p 1 | c h a n n e l 0 | d s l 1 | d s l 2 |
f a s t e t h e r n e t 0 | f o 1 | f o 2 | p o r t 1 | p o r t 2 | p o r t 3 | p o r t 4 |
t u n n e l 0 } a u t o >
< s e t s t p c o s t { b a c k u p - g r o u p 1 | c h a n n e l 0 | d s l 1 | d s l 2 |
f a s t e t h e r n e t 0 | f o 1 | f o 2 | p o r t 1 | p o r t 2 | p o r t 3 | p o r t 4 |
t u n n e l 0 } { 1 - 2 0 0 0 0 0 0 0 0 } >
< s e t s t p m s t i { . . . } c o s t { . . . } { . . . } >

2.19.10 Spanning Tree Point-to-Point Port Property

The spanning tree protocol distinguishes between ports that operate in point-to-point mode
and those that operate in point-to-multipoint mode (any-to-any, shared). In point-to-point-
mode STP BPDUs can only be received from exactly one other bridge. For ports in shared
mode longer transition periods have to be endured as first of all several potential bridges
have to reach a consent. This may lead to unnecessary long convergence periods when the
topology is changed. Hence, it is desirable to set only those ports into point-to-point mode
that are connected to only one other bridge.
The default value varies from interface to interface.
The following applies to the interfaces dsl1, dsl2, backup-group1, channel0 and tunnel0:
The default value for mode is point-to-point.
The following applies for Ethernet links (opitcal and copper ports):
The default value for mode is no point-to-point.
Commands to configure the spanning tree point-to-point port property
< s e t s t p p o i n t - t o - p o i n t { b a c k u p - g r o u p 1 | c h a n n e l 0 | d s l 1 |
d s l 2 | f a s t e t h e r n e t 0 | f o 1 | f o 2 | p o r t 1 | p o r t 2 | p o r t 3 |
p o r t 4 | t u n n e l 0 } >
< s e t s t p n o p o i n t - t o - p o i n t { b a c k u p - g r o u p 1 | c h a n n e l 0 | d s l 1
| d s l 2 | f a s t e t h e r n e t 0 | f o 1 | f o 2 | p o r t 1 | p o r t 2 | p o r t 3 |
p o r t 4 | t u n n e l 0 } >
1KGT151021 V000 1
Spanning Tree Protocol
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