Configuring a Basic LLB Setup
To configure LLB, you first create services representing each router to the Internet Service Providers (ISPs). A PING monitor is bound by default to each service. Binding a transparent monitor is optional but recommended. Then, you create a virtual server, bind the services to the virtual server, and configure a route for the virtual server. The route identifies the virtual server as the gateway to the physical routers represented by the services. The virtual server selects a router by using the load balancing method that you specify. Optionally, you can configure persistence to make sure that all traffic for a particular session is sent over a specific link.
To configure a basic LLB setup, do the following:
Configure services
A default monitor (PING) is automatically bound to a service type of ANY when the service is created, but you can replace the default monitor with a transparent monitor, as described inCreating and Binding a Transparent Monitor.
To create a service by using the command line interface
At the command prompt, type:
add service show service
Example:
添加服务ISP1R_svc_any 10.10.10.254任何*秀service ISP1R_svc_any ISP1R_svc_any (10.10.10.254:*) - ANY State: DOWN Last state change was at Tue Aug 31 04:31:13 2010 Time since last state change: 2 days, 05:34:18.600 Server Name: 10.10.10.254 Server ID : 0 Monitor Threshold : 0 Max Conn: 0 Max Req: 0 Max Bandwidth: 0 kbits Use Source IP: NO Client Keepalive(CKA): NO Access Down Service: NO TCP Buffering(TCPB): YES HTTP Compression(CMP): NO Idle timeout: Client: 120 sec Server: 120 sec Client IP: DISABLED Cacheable: NO SC: OFF SP: OFF Down state flush: ENABLED 1) Monitor Name: ping State: UP Weight: 1 Probes: 244705 Failed [Total: 0 Current: 0] Last response: Success - ICMP echo reply received. Response Time: 1.322 millisec Done
To create services by using the configuration utility
Navigate to Traffic Management > Load Balancing > Services, and create a service.
To create services by using the configuration utility
Navigate to Traffic Management > Load Balancing > Services.
In the details pane, click Add.
In the Create Service dialog box, specify values for the following parameters:
- Service Name*—name
- Server—IP
- Protocol*—serviceType (Select ANY from the drop-down list.)
- Port*—port
A required parameter
Click Create.
Repeat Steps 2-4 to create another service.
Click Close.
In the Services pane, select the services that you just configured and verify that the settings displayed at the bottom of the screen are correct.
Configure an LLB virtual server and bind a service
After you create a service, create a virtual server and bind services to the virtual server. The default LB method of least connections is not supported in LLB. For information about changing the LB method, seeConfiguring the LLB Method and Persistence.
To create a link load balancing virtual server and bind a service by using the command line interface
At the command prompt, type:
加磅vserver <名称> < serviceType >绑定磅vserver < name> show lb vserver < name>
Example:
add lb vserver LLB-vip any bind lb vserver LLB-vip ISP1R_svc_any sh lb vserver LLB-vip LLB-vip (0.0.0.0:0) - ANY Type: ADDRESS State: DOWN Last state change was at Thu Sep 2 10:51:32 2010 Time since last state change: 0 days, 17:51:46.770 Effective State: DOWN Client Idle Timeout: 120 sec Down state flush: ENABLED Disable Primary Vserver On Down : DISABLED No. of Bound Services : 1 (Total) 0 (Active) Configured Method: ROUNDROBIN Mode: IP Persistence: NONE Connection Failover: DISABLED 1) ISP1R_svc_any (10.10.10.254: *) - ANY State: DOWN Weight: 1 Done
To create a link load balancing virtual server and bind a service by using the configuration utility
- Navigate toTraffic Management>Load Balancing>Virtual Servers, and create a virtual server for link load balancing. SpecifyANYin theProtocolfield.
- In theIP Address Typedrop-down list, select the desired option. SelectNon Addressableto create a virtual server that is not directly accessible.
- Under theServicestab, in theActivecolumn, select the check box for the service that you want to bind to the virtual server.
Configure the LLB method and persistence
By default, the Citrix ADC appliance uses the least connections method to select the service for redirecting each client request, but you should set the LLB method to one of the supported methods. You can also configure persistence, so that different transmissions from the same client are directed to the same server.
To configure the LLB method and/or persistence by using the command line interface
At the command prompt, type the following command:
set lb vserver -lbMethod -persistenceType show lb vserver
Example:
set lb vserver LLB-vip -lbmethod ROUNDROBIN -persistencetype SOURCEIP show lb vserver LLB-vip LLB-vip (0.0.0.0:0) - ANY Type: ADDRESS State: DOWN Last state change was at Fri Sep 3 04:46:48 2010 Time since last state change: 0 days, 00:52:21.200 Effective State: DOWN Client Idle Timeout: 120 sec Down state flush: ENABLED Disable Primary Vserver On Down : DISABLED No. of Bound Services : 0 (Total) 0 (Active) Configured Method: ROUNDROBIN Mode: IP Persistence: SOURCEIP Persistence Mask: 255.255.255.255 Persistence v6MaskLength: 128 Persistence Timeout: 2 min Connection Failover: DISABLED
To configure the link load balancing method and/or persistence by using the configuration utility
- Navigate to Traffic Management > Load Balancing > Virtual Servers and select the virtual server for which you want to configure the load balancing method and/or persistence settings.
- In theAdvanced Settingssection, select Method and configure the load balancing method.
- In theAdvanced Settingssection, selectPersistenceand configure the persistence parameters.
Configure an LLB route
After configuring the IPv4 or IPv6 services, virtual servers, LLB methods, and persistence, you configure an IPv4 or IPv6 LLB route for the network specifying the LLB virtual server as the gateway. A route is a collection of links that are load balanced. Requests are sent to the LLB virtual server IP address that acts as the gateway for all outbound traffic and selects the router based on the LLB method configured.
To configure an IPv4 LLB route by using the command line interface
At the command prompt, type:
add lb route show lb route [ ]
Example:
add lb route 0.0.0.0 0.0.0.0 LLB-vip show lb route 0.0.0.0 0.0.0.0 Network Netmask Gateway/VIP Flags ----------- ------------- -------------- -------- 1) 0.0.0.0 0.0.0.0 LLB-vip UP
To configure an IPv6 LLB route by using the command line interface
At the command prompt, type:
add lb route6 show lb route6
Example:
add lb route6 ::/0 llb6_vs show lb route6 Network VIP Flags ----------- --------- -------- 1) ::/0 llb6_vs UP
通过使用configurati配置一个法学学士的路线on utility
Navigate to System > Network > Routes, and selectLLB, and configure the LLB route.
Note:Select LLBV6 to configure an IPV6 route.
通过使用configurati配置一个法学学士的路线on utility
Navigate to System > Network > Routes.
In the details pane, select one of the following:
- Click LLB to configure an IPv4 route.
- Click LLBV6 to configure an IPv4 route.
In the Create LB Route or Create LB IPV6 Routedialog box, set the following parameters:
- Network*
- Netmask*—Required for IPV4 routes.
Gateway Name*—gatewayName
*A required parameter
Click Create, and then click Close. The route that you just created appears on the LLB or the LLB6 tab in the Routes pane.
The following diagram shows a basic LLB setup. A service is configured for each of the two links (ISPs) and PING monitors are bound by default to these services. A link is selected based on the LLB method configured.
Figure 1. Basic LLB Setup
Note
If your Internet service provider has provided an IPv6 address, replace the IPv4 service with an IPv6 service in the above figure.
Create and bind a transparent monitor
You create a transparent monitor to monitor the health of upstream devices, such as routers. You can then bind the transparent monitor to services. The default PING monitor monitors the connectivity only between the Citrix ADC appliance and the upstream device. The transparent monitor monitors all the devices existing in the path from the appliance to the device that owns the destination IP address specified in the monitor. If a transparent monitor is not configured and the status of the router is UP but one of the next hop devices from that router is down, the appliance includes the router while performing load balancing and forwards the packet to the router. However, the packet is not delivered to the final destination because one of the next hop devices is down. By binding a transparent monitor, if any of the devices (including the router) are down, the service is marked as DOWN and the router is not included when the appliance performs link load balancing.
To create a transparent monitor by using the command line interface
At the command prompt, type:
add lb monitor -destIP -transparent YES show lb monitor []
Example:
add lb monitor monitor-1 PING -destIP 10.10.10.11 -transparent YES > show lb monitor monitor-1 1) Name.......: monitor-1 Type......: PING State....: ENABLED Standard parameters: Interval.........: 5 sec Retries...........: 3 Response timeout.: 2 sec Down time.........: 30 sec Reverse..........: NO Transparent.......: YES Secure...........: NO LRTM..............: ENABLED Action...........: Not applicable Deviation.........: 0 sec Destination IP...: 10.10.10.11 Destination port.: Bound service Iptunnel.........: NO TOS..............: NO TOS ID............: 0 SNMP Alert Retries: 0 Success Retries..: 1 Failure Retries..: 0
To create a transparent monitor by using the configuration utility
Navigate to Traffic Management > Load Balancing > Monitors and configure a transparent monitor.
To create a transparent monitor by using the configuration utility
Navigate to Traffic Management > Load Balancing > Monitors.
In the Monitors pane, click Add.
In the Create Monitor dialog box, set the following parameters:
- Name*
- Type*
- Destination IP
Transparent
*A required parameter
Click Create, and then click Close.
In the Monitors pane, select the monitor that you just configured and verify that the settings displayed in the Details pane are correct.
To bind a monitor to a service by using the configuration utility
- Navigate to Traffic Management > Load Balancing > Services.
- On theMonitorstab, underAvailable, select the monitor that you want to bind to the service, and then clickAdd.
绑定使用comman监控服务d line interface
At the command prompt, type:
bind lb monitor show service
Example:
bind lb monitor monitor-HTTP-1 ISP1R_svc_any Done > show service ISP1R_svc_any ISP1R_svc_any (10.10.10.254:*) - ANY State: UP Last state change was at Thu Sep 2 10:51:07 2010 Time since last state change: 0 days, 18:41:55.130 Server Name: 10.10.10.254 Server ID : 0 Monitor Threshold : 0 Max Conn: 0 Max Req: 0 Max Bandwidth: 0 kbits Use Source IP: NO Client Keepalive(CKA): NO Access Down Service: NO TCP Buffering(TCPB): YES HTTP Compression(CMP): NO Idle timeout: Client: 120 sec Server: 120 sec Client IP: DISABLED Cacheable: NO SC: OFF SP: OFF Down state flush: ENABLED 1) Monitor Name: monitor-HTTP-1 State: UP Weight: 1 Probes: 1256 Failed [Total: 0 Current: 0] Last response: Success - ICMP echo reply received. Response Time: 1.322 millisec Done
To bind a monitor to a service by using the configuration utility
- Navigate to Traffic Management > Load Balancing > Services.
- In the details pane, select a service to which you want to bind a monitor, and then click Open.
- In the Configure Service dialog box, on the Monitors tab, under Available, select the monitor that you want to bind to the service, and then click Add.
- Click OK.
- In the Services pane, select the service that you just configured and verify that the settings displayed in the Details pane are correct.