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C
ONFIGURING
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4-5
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– This example sets the switch to operate in QinQ mode.
Configuring the Maximum Frame Size
The maximum transfer unit (or frame size) for traffic crossing the switch
should be set to minimize unnecessary fragmentation and maximize the
transfer of large sequential data streams.
Command Usage
• Fast Ethernet ports are only affected by the System MTU setting.
• Gigabit Ethernet ports are only affected by the Jumbo frame size setting.
• The switch provides more efficient throughput for large sequential data
transfers by supporting jumbo frames on Gigabit Ethernet ports of up
to 9216 bytes. Compared to standard Ethernet frames that run only up
to 1.5 KB, using jumbo frames for Gigabit Ethernet significantly reduces
the per-packet overhead required to process protocol encapsulation
fields.
• Frame sizes for Fast Ethernet ports can be extended up to 1546 bytes,
and are used primarily to allow for additional header fields – not to
significantly increase the per-packet data size. These Fast Ethernet
extended fames and are more often called “baby jumbo frames.”
• To use jumbo frames, both the source and destination end nodes (such
as a computer or server) must support this feature. Also, when the
connection is operating at full duplex, all switches in the network
between the two end nodes must be able to accept the extended frame
size. And for half-duplex connections, all devices in the collision domain
would need to support jumbo frames.
• After setting the jumbo frame size, remember to implement the new
setting by enabling jumbo frames as described in the next section.
Console(config)#system mode qinq
19-10
Console(config)#exit
Console#show system mode
19-11
System mode is QinQ mode
Console#
Содержание 7824M/FSW - annexe 1
Страница 2: ......
Страница 24: ...TABLE OF CONTENTS xxiv ...
Страница 28: ...TABLES xxviii ...
Страница 32: ...FIGURES xxxii Figure 16 3 DNS Cache 16 7 ...
Страница 34: ...GETTING STARTED ...
Страница 46: ...SYSTEM DEFAULTS 1 12 ...
Страница 62: ...SWITCH MANAGEMENT ...
Страница 74: ...CONFIGURING THE SWITCH 3 12 ...
Страница 112: ...BASIC MANAGEMENT TASKS 4 38 ...
Страница 168: ...USER AUTHENTICATION 6 30 ...
Страница 223: ...SHOWING PORT STATISTICS 9 33 Figure 9 12 Port Statistics ...
Страница 230: ...ADDRESS TABLE SETTINGS 10 6 ...
Страница 304: ...CLASS OF SERVICE 13 16 ...
Страница 316: ...QUALITY OF SERVICE 14 12 ...
Страница 338: ...MULTICAST FILTERING 15 22 ...
Страница 346: ...DOMAIN NAME SERVICE 16 8 ...
Страница 348: ...COMMAND LINE INTERFACE IP Interface Commands 35 1 ...
Страница 362: ...OVERVIEW OF COMMAND LINE INTERFACE 17 14 ...
Страница 426: ...SYSTEM MANAGEMENT COMMANDS 19 56 Example Console show calendar 15 12 34 February 1 2002 Console ...
Страница 494: ...USER AUTHENTICATION COMMANDS 21 48 ...
Страница 514: ...CLIENT SECURITY COMMANDS 22 20 ...
Страница 540: ...ACCESS CONTROL LIST COMMANDS 23 26 ...
Страница 558: ...INTERFACE COMMANDS 24 18 ...
Страница 576: ...MIRROR PORT COMMANDS 26 4 ...
Страница 582: ...RATE LIMIT COMMANDS 27 6 ...
Страница 616: ...SPANNING TREE COMMANDS 29 28 ...
Страница 644: ...VLAN COMMANDS 30 28 ...
Страница 664: ...CLASS OF SERVICE COMMANDS 31 20 ...
Страница 678: ...QUALITY OF SERVICE COMMANDS 32 14 ...
Страница 720: ...APPENDICES ...
Страница 726: ...SOFTWARE SPECIFICATIONS A 6 ...
Страница 730: ...TROUBLESHOOTING B 4 ...
Страница 746: ...INDEX Index 6 ...
Страница 747: ......