BROCADE IP PRIMER

Chapter 15: Server Load Balancing (SLB)manager (also called SNMP client) is used. This process is different fromthe SNMP agent process (a.k.a. SNMP server process) on the ServerIron.A ServerIron can be configured as both an SNMP agent (that allows managementof ServerIron through Network Management System), and anSNMP manager (that facilitates the new SNMP based predictor method).In addition, all the real servers must run the SNMP agent daemon andsupport MIBs that can be queried by the SNMP manager of theServerIron. You can fine-tune how traffic is distributed across these realservers by enabling Dynamic Weighted Predictor on the ServerIron. SNMPdynamic predictor is presently not supported for IPv6 traffic.Configuring SLBWe talked about Server Load Balancing (SLB) in Chapter 3. This is the defaultmethod ServerIrons use to load balance to real servers. This requires that allreal servers are physically attached to the ServerIron, or that routing is engineeredin such a way that all traffic to and from the real servers flows throughthe ServerIron. All traffic (pertaining to the VIP) must come into and go out ofthe ServerIron.We'll need to configure real servers, a virtual server, and we'll go over configuringhealth checks as well.Configuring “Real” ServersReal servers are the servers that we want to load balance to. We need todefine them within the ServerIron. We do this in the Global config. Each realserver has its own sub-config:SLB-ServerIron#conf tSLB-ServerIron(config)#server real-name rs1 10.1.1.11SLB-ServerIron(config-rs-rs1)#port httpSLB-ServerIron(config-rs-rs1)#port http url "HEAD /"SLB-ServerIron(config-rs-rs1)#server real-name rs2 10.1.1.12SLB-ServerIron(config-rs-rs2)#port httpSLB-ServerIron(config-rs-rs2)#port http url "HEAD /"SLB-ServerIron(config-rs-rs2)#port smtpSLB-ServerIron(config-rs-rs2)#port smtp keepaliveSLB-ServerIron(config-rs-rs2)#server real-name rs3 10.1.1.13SLB-ServerIron(config-rs-rs3)#port httpSLB-ServerIron(config-rs-rs3)#port http url "HEAD /"SLB-ServerIron(config-rs-rs3)#port smtpSLB-ServerIron(config-rs-rs3)#port smtp keepaliveHere, I've configured three real servers: rs1, rs2, and rs3. The name, by theway, does not need to correspond with any real information on the server. It'spurely for your reference within the ServerIron config. It can be any alphanumericstring up to 32 characters. The IP address, of course, is a very importantelement.334 Brocade IP Primer