Cisco Systems 6000 manual Configuring Route Health Injection, Understanding RHI, RHI Overview

Page 51

Configuring Route Health Injection

To specify the domain name resolve request, perform this task:

	Command	Purpose
Step 1
Step 1	Router(config)# ip slb probe probe-namedns	Configure an DNS probe and enter the tcp probe
		submode1.
Step 2	Router(config-slb-probe-dns)# [expect	Configure times to wait between probes to make
	failed interval retries receive]	a DNS connection, to receive a reply from the
		server, and to limit the number of retries before
		considering the real server as failed.

1.The no form of this command restores the defaults.

Configuring Route Health Injection

These sections describe the route health injection (RHI):

•Understanding RHI, page 51

•Configuring RHI for Virtual Servers, page 53

Understanding RHI

These sections describe the RHI:

•RHI Overview, page 51

•Routing to VIP Addresses Without RHI, page 52

•Routing to VIP Addresses With RHI, page 52

•Understanding How the CSM Determines VIP Availability, page 53

•Understanding Propagation of VIP Availability Information, page 53

RHI Overview

RHI allows the CSM to advertise the availability of a VIP address throughout the network. Multiple CSM devices with identical VIP addresses and services can exist throughout the network. One CSM can override the load-balancing services over the other devices if the services are no longer available on the other devices, or one CSM can provide the services because it is logically closer to the client systems than other server load-balancing devices.

Note RHI is restricted to intranets because the CSM advertises the VIP address as a host-route and most routers do not propagate the host-route information to the Internet.

To enable RHI, configure the CSM to do the following:

•Probe real servers and identify available virtual servers and VIP addresses

•Advertise accurate VIP address availability information to the MSFC whenever a change occurs

		Catalyst 6000 Family Content Switching Module Installation and Configuration Note

	78-11631-02 Rev. A0			51
	78-11631-02 Rev. A0			51

Image 51

Contents Contents Overview Features Describes the features of the CSMThese sections describe the CSM CSM front panel features are shown in Figure Front Panel DescriptionStatus LED Operation Mode RJ-45 ConnectorOff Red Orange Green Green to Orange Content Switching Module and Servers Client-to-CSM-to-Server Traffic Flow Client-to-Content Switching Module-to-Server Traffic FlowSafety Overview CSM memory is not configurable System RequirementsMemory Requirements 72-876-01 Console Cable Not applicable Power RequirementsHardware Supported Environmental RequirementsSoftware Requirements Installing the Content Switching ModulePreparing to Install the CSM Required ToolsInstalling the CSM Power supply Installing Modules in the Catalyst 6000 Family Switch Verifying the Installation Verifying the InstallationUsing the Command-Line Interface Accessing Online HelpUpgrading to a New Software Release Routerconfig# power cycle module slot-number Upgrading from the Supervisor Engine BootflashSet up a session between the supervisor engine and the CSM CSM upgrade 127.0.0.zz c6slb-apc.revision-num.binUpgrading from a Pcmcia Card Routerconfig# tftp-server slotxc6slb-apc.revision-num.binCSM upgrade slot0 c6slb-apc.revision-num.bin Router config# power cycle module slot-numberRouter# vlan database Configuring the Content Switching ModuleSwitchport Switchport access vlanConfiguration Overview Configure the required parameters in the following sections Configuring VLANsSee for the following notes Configuring VLANsConfiguring Server-Side VLANs Configuring Client-Side VLANsConfiguring Server Farms Configuring Real Servers Configuring Policies Configuring Maps Configure multiple cookies Configure multiple cookies into a cookie mapConfiguring Sticky Groups Configuring Virtual Servers Configuring Dynamic Feedback Protocol Configuring TCP ParametersConfiguring Redirect Virtual Servers Configuring Client NAT Pools Configuring Server NAT Writing and Restoring ConfigurationsSingle Subnet Bridge Mode Configuration Configuration ExamplesExit to have the configuration take effect Enter the Vlan modeConfigure a client-side Vlan Configure a server-side VlanSecure Router Mode Configuration Vlan modeCreate the client-side Vlan 2 and enter the SLB Exit the submode Fault-Tolerant ConfigurationRouterconfig# ip slb vlan 3 server Create the server-side Vlan 3 and enter the SLBRouterconfig-if#service-policy input Venus Router# configure terminalRouterconfig# mac access-list extended Venus Routerconfig# int GigabitEthernet 2/1Configuration Parameter On Both Content Switching Modules Fault-tolerant configuration, the following rules apply192.158.38.10 Create the client-side Vlan 2 and enter the SLB Vlan modeAssign the Content Switching IP address on Router B Hsrp addressConfigure a client-side VLAN2 Assign the default route for VlanDefine Vlan 9 as a fault-tolerant Vlan Create the Content Switching primaryHsrp Configuration Overview Configuring HsrpCSG Vlan Configure Switch 2-FT2 Hsrp secondary as followsConfigure VLANs on Hsrp FT2 as follows Configuring CSM VLANsConfiguring Probes for Health Monitoring Configure EtherChannel on both switches as followsAdd ports to the EtherChannel as follows Telnet creates a Telnet probe with a default configuration Probe-name is the name of the probe being configured it hasHttp creates an Http probe with a default configuration Icmp creates an Icmp probe with a default configuration Http Probe Commands Available to all Probe ConfigurationsIcmp Probe TCP Probe FTP, SMTP, and Telnet ProbeDNS Probe Submode Configuring Route Health Injection Understanding RHIRHI Overview Routing to VIP Addresses With RHI Routing to VIP Addresses Without RHIUnderstanding Propagation of VIP Availability Information Configuring RHI for Virtual ServersRouterconfig# ip slb vserver vserver1 Understanding How the CSM Determines VIP AvailabilityTranslated Safety Warnings Safety Information Referral WarningRegulatory Standards Compliance Wrist Strap Warning Blank Faceplate Installation Requirement Warning Translated Safety Warnings Related Documentation Qualified Personnel WarningRelease Notes for Catalyst 6000 Family IOS Software Ordering Documentation Obtaining DocumentationWorld Wide Web Documentation CD-ROMCisco.com Contacting TAC by Using the Cisco TAC WebsiteTo access Cisco.com, go to the following website Obtaining Technical AssistanceContacting TAC by Telephone Obtaining Technical Assistance