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Chapter 45: Multiple Spanning Tree Protocol (MSTP)
672
Overview
As mentioned in Chapter 40, “STP, RSTP and MSTP Protocols” on page
591, STP and RSTP are referred to as single-instance spanning trees that
search for physical loops across all VLANs in a bridged network. When
loops are detected, the protocols stop the loops by placing one or more
bridge ports in a blocking state.
As explained in “Spanning Tree and VLANs” on page 601, STP and RSTP
can result in VLAN fragmentation where VLANs that span multiple bridges
are connected together with untagged ports. The untagged ports creating
the links can represent a physical loop in the network, which are blocked
by spanning tree. This can result in a loss of communication between
different parts of the same VLAN.
One way to resolve this, other than by not activating spanning tree on your
network, is to link the switches using tagged ports, which can handle traffic
from multiple VLANs simultaneously. The drawback to this approach is
that the link formed by the tagged ports can create a bottleneck to your
Ethernet traffic, resulting in reduced network performance.
Another approach is to use the Multiple Spanning Tree Protocol (MSTP).
This spanning tree shares many of the same characteristics as RSTP. It
features rapid convergence and has many of the same parameters. But
the main difference is that while RSTP, just like STP, supports only a
single-instance spanning tree, MSTP supports multiple spanning trees
within a network.
The following sections describe some of the terms and concepts relating
to MSTP. If you are not familiar with spanning tree or RSTP, review
“Overview” on page 592.
Note
Do not activate MSTP on an AT-9000 Allied Telesis Switch without
first familiarizing yourself with the following concepts and guidelines.
Unlike STP and RSTP, you cannot activate this spanning tree
protocol on a switch without first configuring the protocol
parameters.
Note
The AlliedWare Plus MSTP implementation complies fully with the
new IEEE 802.1s standard and should be interoperable with any
other vendor’s fully compliant 802.1s implementation.
Содержание AT-9000/12PoE
Страница 4: ......
Страница 28: ...Contents 28...
Страница 36: ...Tables 36...
Страница 42: ...42...
Страница 76: ...Chapter 2 Starting a Management Session 76...
Страница 100: ...Chapter 4 Basic Command Line Management Commands 100...
Страница 112: ...112...
Страница 130: ...Chapter 7 Basic Switch Management 130...
Страница 170: ...Chapter 8 Basic Switch Management Commands 170...
Страница 284: ...Chapter 12 Power Over Ethernet Commands 284...
Страница 298: ...Chapter 13 IPv4 and IPv6 Management Addresses 298...
Страница 322: ...Chapter 14 IPv4 and IPv6 Management Address Commands 322...
Страница 342: ...Chapter 16 SNTP Client Commands 342...
Страница 371: ...AT 9000 Switch Command Line User s Guide 371 awplus write Save the configuration...
Страница 388: ...Chapter 19 Enhanced Stacking 388...
Страница 406: ...Chapter 20 Enhanced Stacking Commands 406...
Страница 414: ...Chapter 21 Port Mirror 414...
Страница 422: ...Chapter 22 Port Mirror Commands 422...
Страница 432: ...Chapter 23 Internet Group Management Protocol IGMP Snooping 432...
Страница 452: ...Chapter 25 Multicast Commands 452...
Страница 454: ...454...
Страница 462: ...Chapter 26 File System 462...
Страница 488: ...Chapter 29 Boot Configuration File Commands 488...
Страница 500: ...Chapter 30 File Transfer 500...
Страница 508: ...Chapter 31 File Transfer Commands 508...
Страница 510: ...510...
Страница 528: ...Chapter 33 Event Log Commands 528...
Страница 536: ...Chapter 34 Syslog Client 536...
Страница 544: ...544...
Страница 554: ...Chapter 36 Static Port Trunks 554...
Страница 562: ...Chapter 37 Static Port Trunk Commands 562...
Страница 574: ...Chapter 38 Link Aggregation Control Protocol LACP 574...
Страница 588: ...Chapter 39 LACP Commands 588...
Страница 590: ...590...
Страница 610: ...Chapter 40 STP RSTP and MSTP Protocols 610...
Страница 690: ...Chapter 45 Multiple Spanning Tree Protocol MSTP 690...
Страница 716: ...716...
Страница 740: ...Chapter 47 Port based and Tagged VLANs 740...
Страница 760: ...Chapter 48 Port based and Tagged VLAN Commands 760...
Страница 778: ...Chapter 49 GARP VLAN Registration Protocol 778...
Страница 800: ...Chapter 50 GARP VLAN Registration Protocol Commands 800...
Страница 816: ...Chapter 51 MAC Address based VLANs 816...
Страница 830: ...Chapter 52 MAC Address based VLAN Commands 830...
Страница 850: ...Chapter 55 Voice VLAN Commands 850...
Страница 860: ...Chapter 56 VLAN Stacking 860 Section III File System...
Страница 866: ...Chapter 57 VLAN Stacking Commands 866 Section III File System...
Страница 868: ...868...
Страница 878: ...Chapter 58 MAC Address based Port Security 878...
Страница 892: ...Chapter 59 MAC Address based Port Security Commands 892...
Страница 918: ...Chapter 60 802 1x Port based Network Access Control 918...
Страница 960: ...Chapter 61 802 1x Port based Network Access Control Commands 960...
Страница 962: ...962...
Страница 974: ...Chapter 62 SNMPv1 and SNMPv2c 974...
Страница 1024: ...1024...
Страница 1036: ...Chapter 65 sFlow Agent 1036...
Страница 1140: ...Chapter 68 LLDP and LLDP MED Commands 1140...
Страница 1146: ...Chapter 69 Address Resolution Protocol ARP 1146...
Страница 1154: ...Chapter 70 Address Resolution Protocol ARP Commands 1154...
Страница 1170: ...Chapter 71 RMON 1170 awplus show rmon alarm Use the SHOW RMON ALARM command to verify the new alarm...
Страница 1228: ...Chapter 73 Advanced Access Control Lists ACLs 1228...
Страница 1288: ...1288...
Страница 1300: ...Chapter 76 Local Manager Accounts 1300...
Страница 1310: ...Chapter 77 Local Manager Account Commands 1310...
Страница 1316: ...Chapter 78 Telnet Server 1316...
Страница 1324: ...Chapter 80 Telnet Client 1324...
Страница 1328: ...Chapter 81 Telnet Client Commands 1328...
Страница 1340: ...Chapter 82 Secure Shell SSH Server 1340...
Страница 1350: ...Chapter 83 SSH Server Commands 1350...
Страница 1362: ...Chapter 85 Non secure HTTP Web Browser Server Commands 1362...
Страница 1406: ...Chapter 88 RADIUS and TACACS Clients 1406...
Страница 1446: ...Chapter System Monitoring Commands 1446...
Страница 1476: ...Appendix B Management Software Default Settings 1476...