Per VLAN Spanning Tree +
Left running head:
Chapter name (automatic)
184
Beta
Beta
CLI Configuration Guide
Alcatel-Lucent
P
ER
VLAN S
PANNING
T
REE
(PVST+) O
VERVIEW
Spanning-Tree Protocol (STP) is a link management protocol that provides path
redundancy while preventing undesirable loops in the network. For an Ethernet
network to function properly, only one active path can exist between two stations.
Multiple active paths between stations cause loops in the network. If a loop exists
in the network topology, the potential exists for duplication of messages. When
loops occur, some switches see stations appear on both sides of the switch. This
condition confuses the forwarding algorithm, and allows duplicate frames to be
forwarded.
To provide path redundancy, Spanning-Tree Protocol defines a tree that spans all
switches in an extended network. Spanning-Tree Protocol forces certain
redundant data paths into a standby (blocked) state. If one network segment in
the Spanning-Tree Protocol becomes unreachable, or if Spanning-Tree Protocol
costs change, the spanning-tree algorithm reconfigures the spanning-tree
topology and reestablishes the link by activating the standby path. Spanning-Tree
Protocol operation is transparent to end stations, which are unaware whether they
are connected to a single LAN segment or a switched LAN of multiple segments.
Per-VLAN Spanning Tree + (PVST+) maintains a spanning tree instance for each
VLAN configured in the network. Since PVST + treats each VLAN as a separate
network, it has the ability to load balance traffic (at layer-2) by forwarding some
VLANs on one trunk and other Vlans on another trunk without causing a Spanning
Tree loop.
Содержание OmniAccess 700
Страница 38: ...Left running head Chapter name automatic 12 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 176: ...Left running head Chapter name automatic 150 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 224: ...Per VLAN Spanning Tree Left running head Chapter name automatic 198 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 258: ...Port Monitoring Left running head Chapter name automatic 232 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 260: ...Left running head Chapter name automatic 234 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 296: ...T1E1 Line Card Left running head Chapter name automatic 270 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 360: ...Point to Point Protocol Left running head Chapter name automatic 334 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 434: ...Left running head Chapter name automatic 408 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 462: ...Common Classifiers Left running head Chapter name automatic 436 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 464: ...Left running head Chapter name automatic 438 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 534: ...Border Gateway Protocol Left running head Chapter name automatic 508 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 638: ...Left running head Chapter name automatic 612 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 762: ...Filter and Firewall Left running head Chapter name automatic 736 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 890: ...Transparent Firewall Left running head Chapter name automatic 864 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 940: ...Left running head Chapter name automatic 914 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 1000: ...Quality of Service Left running head Chapter name automatic 974 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 1002: ...Left running head Chapter name automatic 976 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 1044: ...DNS Domain Name Service Client Left running head Chapter name automatic 1018 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 1046: ...Left running head Chapter name automatic 1020 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 1058: ...Left running head Chapter name automatic 1032 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 1074: ...Lifeline Left running head Chapter name automatic 1048 Beta Beta CLI Configuration Guide Alcatel Lucent line con 0 end ...
Страница 1076: ...Left running head Chapter name automatic 1050 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 1118: ...Web Cache Server Left running head Chapter name automatic 1092 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 1120: ...Left running head Chapter name automatic 2 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 1140: ...QoS Values and Mnemonics Left running head Chapter name automatic 22 Beta Beta CLI Configuration Guide Alcatel Lucent ...
Страница 1156: ...IPsec Interoperability of OA 700 Left running head Chapter name automatic 38 Beta Beta CLI Configuration Guide Alcatel Lucent ...