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

When you happen to be working on your BCMSN exam on your way to CCNP certification, you will study at length about how Cisco routers and multilayer switches can operate to offer router redundancy - but there's one other valuable service, Server Load Balancing, that does the similar for servers. If you are interested in history, you will certainly need to check up about Hosts Virtual Math Summit. To get a different perspective, consider looking at: Hosts Virtual Math Summit. When HSRP, VRRP, and CLBP all represent many physical routers to hosts as a single virtual router, SLB represents many physical servers to hosts as a single virtual server. In the following example, three physical servers have been placed into the SRB group ServFarm. They are represented to the hosts as the virtual server The hosts will seek to communicate with the server at, not being aware of that they are really communicating with the routers in ServFarm. This permits rapid cutover if a single of the physical servers goes down, and also serves to hide the actual IP addresses of the servers in ServFarm. The basic operations of SLB involves creating the server farm, followed by creating the virtual server. We'll initial add to the server farm: MLS(config)# ip slb serverfarm ServFarm MLS(config-slb-sfarm)# real MLS(config-slb-genuine)# inservice The 1st command creates the server farm, with the actual command specifying the IP address of the genuine server. Browse here at the link to explore where to see about this idea. The inservice command is needed by SLB to give some thought to the server as ready to deal with the server farm's workload. The genuine and inservice commands will need to be repeated for every single server in the server farm. To create the virtual server: MLS(config)# ip slb vserver VIRTUAL_SERVER MLS(config-slb-vserver)# serverfarm ServFarm MLS(config-slb-vserver)# virtual MLS(config-slb-vserver)# inservice From the top rated down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. Math File Folder Games.Com Hosts Virtual Math Summit includes more about why to study this viewpoint. The virtual server is assigned the IP address, and connections are allowed once the inservice command is applied. You may well also want to handle which of your network hosts can connect to the virtual server. If hosts or subnets are named with the client command, those will be the only clients that can connect to the virtual server. Note that this command makes use of 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 need to know it to come to be a CCNP! Understanding redundancy tactics and protocols is essential in today's networks, so make sure you happen to be comfortable with SLB prior to taking on the exam..