ABB EDS500 Series, Руководство по эксплуатации функций

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Spanning Tree Protocol Functions
protocol secures in a transparent way that only one path is active for packet forwarding
between two nodes of a layer-2 network segment. Redundant connections are identified and
blocked if necessary.
2.19.1 Activate, Deactivate, Spanning Tree Protocol Version
The default value for Spanning Tree protocol on all devices is: <set stp enable>
The default value automatically grants a loop-free operation and avoids network failure There
are commands to deactivate STP on the whole device or on single ports.
Commands to activate and deactivate spanning tree
< s e t s t p n o e n a b l e >
< s e t s t p e n a b l e >
< s e t s t p n o e n a b l e { 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 e n a b l e { 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 } >
ADVICE
With deactivated spanning tree protocol, loops in the network topology will lead to packet
storms, undefined behaviour and consequently network failure.
ADVICE
A deactivated apnning tree protocol can not be reset with a global command.
Example 1: <set stp no enable port1> causes that for Port 1 STP stays deactivated even after
command <set stp enable>.
Example 2: <set stp no enable> causes that for Port 1 STP stays deactivated even after
command <set stp enable port1>.
The spanning tree protocol is backward compatible by design which means that a device
that runs RSTP communicates with devices running STP. In analogy, a device running MSTP
communicates with RSTP devices via RSTP and STP devices with STP.
The default value for STP version is: rstp.
Commands to set the spanning tree version
< s e t s t p v e r s i o n r s t p >
< s e t s t p v e r s i o n s t p >
< s e t s t p v e r s i o n m s t p >
Version Specification
STP IEEE 802.1D-1998
RSTP IEEE 802.1D-2004
MSTP IEEE 802.1Q-2011
Table 22: Spanning Tree Versions
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