Difference between revisions of "Spanning Tree protocol history"
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Latest revision as of 08:11, 29 August 2016
Den originale Spanning Tree Protocol IEEE 802.1D var udviklet til Bridgede eller Switchede netværk uden VLAN's. Derfor var det nødvendigt at videreudvikle Spanning tree protokollen for at tilgodese netværk der anvender VLAN.
Cisco anbefaler at man anvender PVST+ i større netværk, men mange andre anbefaler anvendelsen af MST da det er en IEEE standard, samt at konfigurationen er mere overskuelig.
| Protokol | Standard/Proprietær | Årstal | Instanser | Trunk typer | Rapid | Virker sammen med |
|---|---|---|---|---|---|---|
| STP | IEEE 802.1D-1990 | 1990 | 1 | ingen | Nej | - |
| CST | IEEE 802.1Q-1998 | 1998 | 1 | IEEE 802.1Q | Kan anvendes | - |
| MST | IEEE 802.1Q-2005 | 2005 | (Cisco 16) | IEEE 802.1Q | Kan anvendes | - |
| PVST | Cisco proprietær | - | Per-VLAN | ISL | Kan anvendes | - |
| PVST+ | Cisco proprietær | - | Per-VLAN | IEEE 802.1Q,ISL | Kan anvendes | PVST,PVST+,CST |
Bemærk: Rapid Spanning Tree Protocol (RSTP) er implementeret i RPVST+. Når Cisco dokumentation ofte næver RSTP betyder det at der anvendes RPVST+.
Cisco og Spanning-Tree
Default Spanning-Tree protokol på Cisco Switche er PVST+ (Per-VLAN Spanning Tree plus) som er vist som pvst.
Cisco PVST+
Dist2#<input>conf t</input>
Enter configuration commands, one per line. End with CNTL/Z.
Dist2(config)#<input>spanning-tree mode ?</input>
mst Multiple spanning tree mode
<notice>pvst Per-Vlan spanning tree mode</notice>
rapid-pvst Per-Vlan rapid spanning tree mode
Dist2(config)#<input>spanning-tree mode pvst</input>
Dist2(config)#<input>^Z</input>
*Mar 1 00:16:47.111: %SYS-5-CONFIG_I: Configured from console by console
Dist2#<input>show spanning-tree summary</input>
Switch is in <notice>pvst mode</notice>
Root bridge for: none
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is short
Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0001 0 0 0 3 3
VLAN0100 0 0 0 3 3
---------------------- -------- --------- -------- ---------- ----------
2 vlans 0 0 0 6 6Cisco RPVST+
Dist2#<input>conf t</input>
Enter configuration commands, one per line. End with CNTL/Z.
Dist2(config)#<input>spanning-tree mode rapid-pvst</input>
Dist2(config)#<input>^Z</input>
*Mar 1 00:16:47.111: %SYS-5-CONFIG_I: Configured from console by console
Dist2#<input>show spanning-tree summary</input>
Switch is in <notice>rapid-pvst mode</notice>
Root bridge for: none
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is short
Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0001 0 0 0 3 3
VLAN0100 0 0 0 3 3
---------------------- -------- --------- -------- ---------- ----------
2 vlans 0 0 0 6 6