Extreme Networks ExtremeWare Enterprise Manager Guía de usuario Pagina 332
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17-2 E
XTREME
W
ARE
S
OFTWARE
U
SER
G
UIDE
S
ERVER
L
OAD
B
ALANCING
(SLB)
O
VERVIEW
Server Load Balancing (SLB) is a feature of the switch that divides many client requests
among several servers. This is done transparently to the client trying to use the
resource. The main use for SLB is in the capacity of web hosting. Web hosting uses
several redundant servers to increase the performance and reliability of busy websites.
Using SLB, the switch can manage and balance traffic for client equipment such as web
servers, cache servers, routers, firewalls, and proxy servers. SLB has a variety of useful
features that meet the special needs of e-commerce sites, Internet service providers, and
managers of large intranets.
An introductory SLB application is shown in Figure 17-1.
Figure 17-1: Introductory SLB application
SLB C
OMPONENTS
There are three components that comprise an SLB system:
• Nodes
• Pools
• Virtual Servers
All three components are required for every SLB configuration.
EW_055
Clients
Stream 1
Servers
Stream 2
Stream 3
Stream 2
Stream 1
Stream 3
- ExtremeWare Software 1
- User Guide 1
- Contents 3
- 2ACCESSING THE SWITCH 4
- 3MANAGING THE SWITCH 4
- AND PORTS 5
- 6VIRTUAL LANS (VLANS) 6
- 7FORWARDING DATABASE (FDB) 7
- 8SPANNING TREE PROTOCOL (STP) 8
- 9QUALITY OF SERVICE (QOS) 8
- 11 IP UNICAST ROUTING 10
- 14 IP MULTICAST ROUTING 12
- 15 IPX ROUTING 13
- 16 ACCESS POLICIES 13
- ERVER LOAD BALANCING (SLB) 15
- 19 USING EXTREMEWARE VISTA 16
- ASUPPORTED STANDARDS 17
- BTROUBLESHOOTING 17
- INDEX OF COMMANDS 18
- NTRODUCTION 19
- ONVENTIONS 20
- UBLICATIONS 21
- ExtremeWare Overview 23
- IFFERENCES 27
- UNCTIONALITY 28
- ULL L3 FUNCTIONALITY 28
- ICENSING 29
- BTAINING 30
- MacVLanDiscover 31
- Accessing the Switch 33
- BBREVIATED SYNTAX 34
- NDERSTANDING 35
- CCESSING 36
- Table 2- 2: Line-Editing Keys 37
- is +/- minutes from 39
- ANAGEMENT 41
- DMINISTRATOR 42
- HANGING THE DEFAULT PASSWORD 43
- IEWING ACCOUNTS 44
- RACEROUTE 47
- Managing the Switch 49
- 10/100 UTP M 50
- 2 (SSH2) 55
- <tcp_port_number>} 56
- ONTROLLING 57
- RADIUS C 61
- UTHENTICATION 62
- ONFIGURING RADIUS CLIENT 62
- Table 3- 2: RADIUS Commands 63
- UTHENTICATING 67
- TACACS+ 68
- Configuring BlackDiamond and 75
- Alpine Switch Slots and Ports 75
- Load-Sharing 83
- 4-port groups x x x x 83
- 2-port groups x x x x 83
- ISCOVERY 87
- IRRORING 98
- ONFIGURING 100
- Failover linksPrimary links 101
- Virtual LANs (VLANs) 103
- Marketing 105
- System 1 106
- System 2 106
- Accounting 107
- Engineering 107
- SSIGNING A VLAN TAG 108
- REDEFINED PROTOCOL FILTERS 112
- = IP traffic 112
- = All other traffic 112
- ONFIGURATION 116
- ISPLAYING 118
- EGISTRATION 119
- VLAN Red 120
- Untagged 120
- UIDELINES 123
- IMITATIONS 123
- Forwarding Database (FDB) 127
- ORWARDING 128
- Spanning Tree Protocol (STP) 133
- ONFIGURATIONS 135
- Sales, Personnel, Marketing 136
- Sales & Engineering 137
- ISABLING 141
- ESETTING 141
- Quality of Service (QoS) 143
- PPLICATIONS 145
- SSIGNING 147
- TTRIBUTES 147
- ERMANENT MAC ADDRESSES 152
- DDRESSES 153
- LACKHOLE 153
- ERIFYING 154
- ONFIGURING 802.1P PRIORITY 154
- BSERVING 155
- NFORMATION 155
- EPLACING 160
- point instead of repeating 161
- ROUPINGS 162
- ERFORMANCE 163
- ODIFYING 165
- ETERMINING 173
- LGORITHMS 175
- BD_F32F8 177
- BD_F32T8 177
- SUG_4fr8 178
- SUG_4FX8 178
- SUG_48f8 179
- OSPF/BGP4 180
- AGGREGATION 183
- Table 10-1: ESRP Commands 184
- OSPF or RIP 187
- IP Unicast Routing 191
- NTERFACES 192
- OPULATING 193
- ULTIPLE ROUTES 194
- NCAPABLE 195
- RIORITIES 196
- ULTINETTING 197
- PERATION 198
- GGREGATION 201
- 1234AB5678 202
- ROPERTIES 203
- DHCP/BOOTP R 206
- ROCESSING 208
- Table 11-4: Basic IP Commands 209
- = NetBIOS traffic 216
- Interior Gateway Routing 221
- Protocols 221
- ROTOCOLS 222
- VER VIEW 223
- Virtual link 229
- Area 2 Area 1 Area 0 229
- ABR 1 ABR 2 230
- Area 1 Area 0 Area 3 230
- ASBR ASBR 231
- ISTRIBUTING 233
- Triggered update 236
- Exterior Gateway Routing 251
- OMMUNITIES 253
- OUTE CONFEDERATION EXAMPLE 254
- IP Multicast Routing 267
- ULTICAST 268
- PARSE MODE (PIM-SM) 269
- ULTICASTING 270
- Protocol (IGMP) 273
- PIM-DM C 276
- IPX Routing 281
- 192.207.35.0 282
- Personnel 282
- 192.207.36.0 282
- NCAPSULATION 283
- YNAMIC ROUTES 284
- TATIC ROUTES 284
- DVERTISEMENTS 285
- Access Policies 295
- ESTABLISHED 298
- 10.10.10.1 305
- 10.10.10.100 10.10.20.100 305
- 10.10.20.1 305
- NET20 VLANNET10 VLAN 306
- XAMPLE 2: FILTER ICMP PACKETS 308
- PECIFYING 311
- EQUENCE NUMBERING 311
- Internet 314
- Backbone (RIP) 314
- SalesEngsvrs 314
- Engsvrs Sales 314
- OUTE MAP EXAMPLE 326
- Server Load Balancing (SLB) 331
- OMPONENTS 332
- ALANCING 334
- RANSLATIONAL 338
- RANSLATION 340
- Clients Servers 341
- DVERTISEMENT 342
- ONNECTIONS 344
- PPLICATION 348
- Server pools 349
- ERVICE-CHECK COMMANDS 355
- ERSISTENCE 356
- VAILABILITY 357
- SLB switch 358
- SING MANUAL FAIL-BACK 361
- EDIRECTION 368
- Client VLAN 370
- Cache VLAN 370
- ONITORING 371
- Table 18-1 describes 372
- IAGNOSTICS 373
- TATISTICS 374
- EAL-TIME DISPLAY 379
- Table 18-5: Logging Commands 381
- Table 18-6: Event Actions 385
- Using ExtremeWare Vista 387
- AVIGATING 390
- ROWSER CONTROLS 391
- ILTERING 392
- Software Upgrade and Boot 395
- EBOOTING 396
- YNCHRONIZING 401
- Supported Standards 405
- UPPORTED 406
- TANDARDS 406
- Troubleshooting 407
- ROUBLESHOOTING 408
- NTERFACE 409
- Numerics 415
- (table) 3-23 422
- Index of Commands 425
- Index of Commands - iii 427
- Index of Commands - v 429
- replacement ports 9-17 431
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