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Server and application port states
4
Displaying real server state information
To display real server information, enter the following command at any level of the CLI.
Information about the remaining real servers has been omitted for brevity.
Syntax: show server real
The state information lists the state of the server itself first. Then the states of each of the
application ports configured on the server are displayed.
In this example, the server itself is enabled. The HTTP port is also enabled, but the “default” port (a
port the Brocade Virtual ADX automatically configures on all the real and virtual servers) is
unbound (unbnd). These states are typical of a Brocade Virtual ADX that is configured for
deployment but has not been connected to the real servers.
If information appears under the row for the HTTP application, it shows settings for the Layer 7
health checks for the port. For information about HTTP health checks and other configurable Layer
7 health check parameters, refer to “Port-specific settings for Layer 7 health checks” on page 176.
SUSPECT The Brocade Virtual ADX associates a time stamp with each packet sent to and received from the
real servers. If the time gap between the last packet received from the server and the last packet
sent to the server grows to 3 or 4 seconds, the Brocade Virtual ADX sends a Layer 4 health check
to the service. (If applicable, and if the server passes the Layer 4 health check, the Brocade
Virtual ADX then sends a Layer 7 health check to the application.) If the application does not
respond within a specified interval, the Brocade Virtual ADX changes the state to SUSPECT and
resends the Layer 4 (and if applicable, Layer 7) health check up to a specific number of retries. If
the application still does not respond after all the retries, the state changes to FAILED and the
server state changes to TEST. If the application does respond, the application state changes to
ACTIVE.
GRACE_DN The forced-shutdown option has been used to gracefully shut the server down.
ACTIVE The application has passed its Layer 4 (and if applicable, Layer 7) health check.
UNBND The application is configured on the real server but is not yet bound to a virtual server.
TABLE 16 Application port states (Continued)
State Description
Virtual ADX(config)#show server real
Real Servers Info
========================
State - ACT:active, ENB:enabled, FAL:failed, TST:test, SUS:suspect,
GDN:grace-dn, DIS:disabled, UNK:unknown, UNB:unbind,
AWU:await-unbind, AWD: await-shutdown
Name: rs1 State: Enabled IP:10.95.7.1: 1
Mac: Unknown Weight: 1/1 MaxConn: n/a
SrcNAT: not-cfg, not-op DstNAT: not-cfg, not-op Serv-Rsts: 0
Port St Ms CurConn TotConn Rx-pkts Tx-pkts Rx-octet Tx-octet Reas
---- -- -- ------- ------- ------- ------- -------- -------- ----
default UNB 0 0 0 0 0 0 0 0
http ENB 0 0 0 0 0 0 0 0
Server Total 0 0 0 0 0 0 0
- Brocade Virtual ADX 1
- Document History 2
- Contents 3
- Chapter 4 Health Checks 7
- 53-1003247-01 10
- Appendix C Acknowledgements 12
- Document conventions 13
- Command syntax conventions 14
- Notes, cautions, and warnings 14
- Brocade resources 15
- Document feedback 16
- Features 17
- • KVM host 0.9.0 or higher 18
- Feature summary 19
- Server Load Balancing 23
- How SLB works 24
- Load-balancing predictor 24
- Connections Server load 27
- Dynamic weighted predictor 29
- Sticky connections 30
- Application port groups 31
- Concurrent connections 31
- Remote Servers 32
- Direct Server Return 32
- Understanding L3 DSR 33
- Configuring basic SLB 34
- Configuration guidelines 35
- Configuring the smooth factor 41
- Real server ports 43
- Configuring a stateless port 46
- Source NAT 47
- Enabling source NAT globally 49
- Remote server 52
- Setting the sticky age 53
- Enabling group sticky 56
- Application port grouping 59
- Tracking primary ports 60
- Track port group function 60
- Primary and backup servers 65
- Configuration example 68
- Current backup scheme 70
- Real server backup commands 71
- Server backup association 71
- Display the backup bindings 73
- Health checks with L2 DSR 75
- L2 DSR configuration example 76
- Health checks with L3 DSR 80
- L3 DSR configuration example 80
- Displaying server information 81
- Port ranges 81
- Defining a port range 82
- Multiple port binding 85
- Configuration rules 86
- Port aliases 88
- Real server groups 93
- Defining a real server group 94
- Showing real server groups 95
- Disabling VIPs 95
- Disabling a real server 96
- Deleting a VIP 97
- Enabling force-delete 98
- Real server shutdown 99
- Port holddown timer 99
- Behavior with flapping ports 100
- Displaying port holddown 101
- Persistent hash table 102
- Clear vs reassign mechanisms 103
- Enabling persistent hashing 103
- Real server failure 108
- Field Description 109
- Configuration example: 111
- Policy-based SLB 112
- Configuring a policy list 113
- 10.10.10.10 1 114
- 20.20.0.0/16 2 114
- PBSLB pool failsafe group 118
- Auto Download of PBSLB list 119
- PBSLB syslog messages 120
- Displaying PBSLB entries 120
- Packet trace 121
- Miscellaneous options 122
- Adding a description 123
- • All TCP traffic 126
- • All UDP traffic 126
- • Individual TCP or UDP ports 126
- Disabling port translation 128
- • Quietly drops the request 130
- Configuring TCP fast aging 132
- Enabling transparent VIP 133
- Enabling SYN ACK threshold 134
- Cloning real servers 134
- Configuring a host range 135
- VIP route health injection 140
- Configuration considerations 141
- Enabling or disabling VIP RHI 142
- Defining the health of a VIP 144
- VIP RHI with dangling subnets 146
- Example of non-dangling VIPs 147
- Example of dangling VIPs 147
- Displaying route type 148
- Configuration examples 149
- FIGURE 22 Primary mode 150
- Site 2 configuration 153
- Primary mode and backup mode 157
- Site 1 configuration 157
- RTSP server load balancing 166
- TFTP load balancing 166
- Show and debug commands 167
- Overview 169
- Stateless TCP and UDP ports 169
- • Source IP: 10.161.1.88 171
- Feature limitations 173
- Example 174
- Health Checks 175
- • If the ARP entry ages out 176
- Layer 4 health checks 177
- Layer 7 health checks 182
- Application ports 183
- HTTP (status code) 185
- HTTP (content verification) 186
- Anonymous bonding 187
- Authenticated bonding 188
- SSL (complete) 191
- SSL (simple) 192
- Enabling Layer 7 health check 193
- Server states 200
- Application port states 201
- State Description 202
- Port profiles and attributes 203
- Configuring a port profile 204
- Attribute Description 205
- Port policy 209
- Binding the policy 211
- Command line interface 213
- Element health checks 214
- Example for IPv4 215
- Example for IPv6 215
- Content match for HTTP 224
- Displaying HTTP match lists 226
- Binary scripted health check 230
- Boolean health checks 232
- Reassign threshold 236
- Preventing state flapping 237
- Best path to a remote server 238
- Slow-start mechanism 241
- Port slow-start mechanism 243
- Health-check state 249
- Enhanced server bringup 250
- Sample show commands 251
- Session table parameters 252
- Virtual ADX(config)#end 253
- Virtual ADX#reload 253
- Configuring TCP age 255
- Configuring UDP age 255
- Setting the clock scale 256
- Layer 7 Content Switching 259
- Enabling CSW 260
- Specifying scan depth 260
- Enabling CSW load balance 260
- CSW rules 261
- URL rules 262
- HTTP header rules 263
- XML tag rules 264
- XML tag rule 265
- Description Syntax Example 265
- CSW policies 266
- , the persist string begins 268
- Configuring the log action 269
- Inserting a cookie 270
- Deleting a cookie 270
- Damaging a cookie 271
- Inserting an HTTP header 271
- on page 257 272
- on page 258 272
- "/," 278
- Configuring redirect 280
- Prefix matching 281
- Sample configurations 282
- CSW topology 283
- Request delete configuration 283
- #default forward 1026 286
- Response header rewrite 287
- Creating a CSW policy 288
- Specifications 290
- CSW nested rules 295
- Usage example 297
- Displaying CSW information 298
- Field... Description 299
- 305
- Cleaning up all hash buckets 306
- HTTP 1.1 support 307
- Default settings 308
- Enabling the TCP offload mode 308
- SSL session ID workflow 315
- Configuration Example 317
- Command reference 318
- Hot Standby High Availability 321
- • Port map synchronization 322
- • MAC table synchronization 322
- • Session synchronization 322
- Source-NAT in Hot Standby 330
- Configuring a backup group ID 331
- Setting the backup timer 331
- Enabling backup preference 332
- Delayed failover 334
- SIP Server Load Balancing 339
- SIP packet flow 340
- SIP client registration 342
- SIP terminology 342
- SIP message headers 343
- SIP SLB and call persistence 344
- Sample deployment topologies 346
- Configuring SIP SLB 349
- Configuring health check 353
- Debug commands 356
- Debugging SIP sessions 357
- Debugging SIP transactions 357
- Debugging UDP processes 357
- Debugging SIP packet traces 358
- SIP SLB command reference 359
- Defining IPv6 real servers 362
- Defining IPv6 virtual servers 362
- Defining IP routes 362
- VLAN and tagging definitions 363
- Miscellaneous 363
- Saving the configuration 363
- IPv6 configuration example 363
- Windows NT 366
- Deleting the unwanted routes 367
- Long method 368
- SLB Show and Debug Commands 371
- Enter Utility 373
- Configuring Capture Buffer 374
- Specify filter(s) 374
- TABLE 37 IP Filter Settings 375
- TABLE 38 TCP Filter Settings 375
- TABLE 39 UDP Filter Settings 375
- Example: 376
- Apply filter(s) 377
- Start Capturing Process 378
- Stop Capturing Process 379
- View Captured Packets 379
- In port: 15 381
- • source IP: 192.168.8.100 382
- Saving captured packets 383
- Helpful tips 384
- • Enabled 393
- • Disabled 393
- Syntax: show server session 398
- Virtual ADX#stop-repeat-show 403
- Acknowledgements 405
- Cryptographic software 406
- Original SSLeay License 406
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