Chapter 34: Link Aggregation Control Protocol (LACP)
456
Section V: Port Trunks
Overview
The Link Aggregation Control Protocol (LACP) is used to increase the
bandwidth between the switch and other LACP-compatible devices by
grouping ports together to form single virtual links.
LACP trunks are similar in function to static port trunks, but they are more
flexible. The implementations of static trunks tend to be vendor specific
and so may not always be compatible. In contrast, the implementation of
LACP in the switch is compliant with the IEEE 802.3ad standard. It is
interoperable with equipment from other vendors that also comply with the
standard. This makes it possible to create LACP trunks between the
switch and network devices from other manufacturers.
Another advantage is that ports in an LACP trunk can function in a
standby mode, which adds redundancy and resiliency. If a link in a static
trunk goes down, the overall bandwidth of the trunk is reduced until the
link is reestablished or another port is added to the trunk. In contrast,
LACP trunks can automatically activate ports in a standby mode when
active links fail, to maintain the maximum possible bandwidth of the trunk.
For example, assume you create an LACP trunk of ports 11 to 20 on the
switch, with ports 11 to 18 as the active ports and ports 19 and 20 as the
reserve ports. If an active port loses its link, the switch automatically
activates one of the reserve ports to maintain maximum bandwidth of the
trunk.
The main component of an LACP trunk is an aggregator. An aggregator is
a group of ports on the switch. The ports of an aggregator are further
grouped into a trunk, referred to as an aggregate trunk.
An aggregate trunk can consist of any number of ports on the switch, but
only a maximum of eight ports can be active at a time. If an aggregate
trunk contains more ports than can be active at one time, the extra ports
are placed in the standby mode. Ports in the standby mode do not pass
network traffic, but they do transmit and accept LACP data unit (LACPDU)
packets, which the switch uses to search for LACP-compliant devices.
Only ports on the switch that are part of an aggregator transmit LACPDU
packets. If a port that is part of an aggregator does not receive LACPDU
packets from its corresponding port on another device, it assumes that the
other port is not part of an LACP trunk and functions as a normal Ethernet
port by forwarding network traffic. However, it does continue to send
LACPDU packets. If it begins to receive LACPDU packets, it automatically
transitions to an active or standby mode as part of an aggregate trunk.
An aggregator can have only one trunk. You have to create a separate
aggregator for each trunk on the switch.
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Страница 4: ......
Страница 26: ...Contents 26...
Страница 30: ...Tables 30...
Страница 36: ...36 Section I Getting Started...
Страница 70: ...Chapter 2 Starting a Management Session 70 Section I Getting Started...
Страница 96: ...96 Section II Basic Operations...
Страница 142: ...Chapter 6 Basic Switch Management Commands 142 Section II Basic Operations...
Страница 220: ...Chapter 9 IPv4 and IPv6 Management Addresses 220 Section II Basic Operations...
Страница 244: ...Chapter 10 IPv4 and IPv6 Management Address Commands 244 Section II Basic Operations...
Страница 264: ...Chapter 12 SNTP Client Commands 264 Section II Basic Operations...
Страница 298: ...Chapter 15 Enhanced Stacking 298 Section II Basic Operations...
Страница 312: ...Chapter 16 Enhanced Stacking Commands 312 Section II Basic Operations...
Страница 318: ...Chapter 17 Port Mirror 318 Section II Basic Operations...
Страница 324: ...Chapter 18 Port Mirror Commands 324 Section II Basic Operations Example awplus show mirror...
Страница 350: ...Chapter 21 Multicast Commands 350 Section II Basic Operations...
Страница 352: ...352 Section III File System...
Страница 360: ...Chapter 22 File System 360 Section III File System...
Страница 383: ...AT 9000 Switch Command Line User s Guide Section III File System 383 Example awplus show boot...
Страница 386: ...Chapter 25 Boot Configuration File Commands 386 Section III File System...
Страница 398: ...Chapter 26 File Transfers 398 Section III File System...
Страница 406: ...Chapter 27 File Transfer Commands 406 Section III File System...
Страница 408: ...408 Section IV Event Messages...
Страница 430: ...Chapter 30 Syslog Client 430 Section IV Event Messages...
Страница 438: ...438 Section V Port Trunks...
Страница 448: ...Chapter 32 Static Port Trunks 448 Section V Port Trunks...
Страница 480: ...480 Section VI Spanning Tree Protocols...
Страница 500: ...Chapter 36 Spanning Tree and Rapid Spanning Tree Protocols 500 Section VI Spanning Tree Protocols...
Страница 520: ...Chapter 38 STP Commands 520 Section VI Spanning Tree Protocols...
Страница 542: ...Chapter 40 RSTP Commands 542 Section VI Spanning Tree Protocols Example awplus show spanning tree...
Страница 558: ...558 Section VII Virtual LANs...
Страница 600: ...Chapter 42 Port based and Tagged VLAN Commands 600 Section VII Virtual LANs...
Страница 634: ...Chapter 44 GARP VLAN Registration Protocol Commands 634 Section VII Virtual LANs...
Страница 670: ...Chapter 47 Private Port VLANs 670 Section VII Virtual LANs...
Страница 692: ...Chapter 50 VLAN Stacking 692 Section VII Virtual LANs...
Страница 698: ...Chapter 51 VLAN Stacking Commands 698 Section VII Virtual LANs...
Страница 700: ...700 Section VIII Port Security...
Страница 748: ...Chapter 54 802 1x Port based Network Access Control 748 Section VIII Port Security...
Страница 790: ...Chapter 55 802 1x Port based Network Access Control Commands 790 Section VIII Port Security...
Страница 792: ...792 Section IX Simple Network Management Protocols...
Страница 804: ...Chapter 56 SNMPv1 and SNMPv2c 804 Section X Simple Network Management Protocols...
Страница 852: ...852 Section X Network Management...
Страница 976: ...Chapter 63 Address Resolution Protocol ARP 976 Section X Network Management...
Страница 1090: ...1090 Section XI Management Security...
Страница 1114: ...Chapter 71 Telnet Server 1114 Section XI Management Security...
Страница 1122: ...Chapter 73 Telnet Client 1122 Section XI Management Security...
Страница 1126: ...Chapter 74 Telnet Client Commands 1126 Section XI Management Security...
Страница 1138: ...Chapter 75 Secure Shell SSH Server 1138 Section XI Management Security...
Страница 1158: ...Chapter 78 Non secure HTTP Web Browser Server Commands 1158 Section XI Management Security...
Страница 1186: ...Chapter 80 Secure HTTPS Web Browser Server Commands 1186 Section XI Management Security...
Страница 1202: ...Chapter 81 RADIUS and TACACS Clients 1202 Section XI Management Security...
Страница 1230: ...Chapter 82 RADIUS and TACACS Client Commands 1230 Section XI Management Security...
Страница 1244: ...Chapter System Monitoring Commands 1244...
Страница 1278: ...Index 1278 Configuration mode 644 659 VLAN SET MACADDRESS command Port Interface mode 644 661 W WRITE command 75 94 385...