When you're functioning on your BCMSN exam on your way to CCNP certification, you will read at length about how Cisco routers and multilayer switches can operate to provide router redundancy - but there's a different helpful service, Server Load Balancing, that does the exact same for servers. While HSRP, VRRP, and CLBP all represent various physical routers to hosts as a single virtual router, SLB represents multiple physical servers to hosts as a single virtual server. In the following example, 3 physical servers have been placed into the SRB group ServFarm. They are represented to the hosts as the virtual server 210.1.1.14. The hosts will seek to communicate with the server at 210.1.1.14, not knowing that they're actually communicating with the routers in ServFarm. This makes it possible for fast cutover if one of the physical servers goes down, and also serves to hide the actual IP addresses of the servers in ServFarm. The fundamental operations of SLB includes building the server farm, followed by building the virtual server. We'll 1st add 210.1.1.11 to the server farm: MLS(config)# ip slb serverfarm ServFarm MLS(config-slb-sfarm)# real 210.1.1.11 MLS(config-slb-true)# inservice The 1st command creates the server farm, with the real command specifying the IP address of the true server. Visiting quality virtual receptionist by visiting our wonderful article directory. The virtual server is assigned the IP address 210.1.1.14, and connections are allowed when the inservice command is applied. You may perhaps also want to control which of your network hosts can connect to the virtual server. If hosts or subnets are named with the client command, these will be the only clients that can connect to the virtual server. Note that this command uses wildcard masks. The following configuration would permit only the hosts on the subnet 210.1.1. /24 to connect to the virtual server. MLS(config-slb-vserver)# client 210.1.1. ..255 SLB is the server end's answer to HSRP, VRRP, and GLBP - but you nonetheless have to have to know it to turn into a CCNP! Recognizing redundancy approaches and protocols is essential in today's networks, so make confident you're comfy with SLB before taking on the exam.

CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
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