When you're working on your BCMSN exam on your way to CCNP certification, you'll read at length about how Cisco routers and multilayer switches can work to provide router redundancy - but there's another helpful service, Server Load Balancing, that does the same for servers. While HSRP, VRRP, and CLBP all represent multiple physical routers to hosts as a single virtual router, SLB represents multiple physical servers to hosts as a single virtual server.
Laptop Battery In the following example, three physical servers have been placed into the SRB group ServFarm. They're represented to the hosts as the virtual server 210.1.1.14.
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Thinkpad 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 allows quick cutover if one of the physical servers goes down, and also serves to hide the actual IP addresses of the servers in ServFarm.
"Computer industry analysts estimate that some 60 percent of all corporate data exists only on desktop and laptop computers, " said Walter Scott, CEO of Acronis. "Incorporating Acronis True Image with New Mexico Software backup server is the ideal solution to capture that corporate data and ensure that it is not lost. While traditional server backups are effective for protecting server data, every company should have a combination of server and workstation backup plans."
Microsoft The basic operations of SLB involves creating the server farm, followed by creating the virtual server. We'll first add 210.1.1.11 to the server farm:
And then, of course, we have the Standalone Server product, which is called Acronis True Image Server for Windows or Linux and that will manage a single standalone server. What type of computers can we back up, because in a medium to a large sized, even some small sized businesses, who knows what kind of computers they have They may have laptops, they may have desktops, they may just have anything and everything
Laptop Computers MLS(config)# ip slb serverfarm ServFarm
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Laptop Computer MLS(config-slb-sfarm)# real 210.1.1.11
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Desktop Computer MLS(config-slb-real)# inservice
Notebooks The first command creates the server farm, with the real command specifying the IP address of the real server. The inservice command is required by SLB to consider the server as ready to handle the server farm's workload. The real and inservice commands should be repeated for each server in the server farm.
Lenovo To create the virtual server:
Hard Drive MLS(config)# ip slb vserver VIRTUAL_SERVER
Travelstar MLS(config-slb-vserver)# serverfarm ServFarm
Gateway MLS(config-slb-vserver)# virtual 210.1.1.14
Laptop Parts MLS(config-slb-vserver)# inservice
Software From the top down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP address 210.1.1.14, and connections are allowed once the inservice command is applied.
Hard Drives You may 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, those will be the only clients that can connect to the virtual server. Note that this command uses wildcard masks. The following configuration would allow only the hosts on the subnet 210.1.1.0 /24 to connect to the virtual server.
Electronics MLS(config-slb-vserver)# client 210.1.1.0 0.0.0.255
Canon SLB is the server end's answer to HSRP, VRRP, and GLBP - but you still need to know it to become a CCNP! Knowing redundancy strategies and protocols is vital in today's networks, so make sure you're comfortable with SLB before taking on the exam.
Desktop Pc
Desktop Computers Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (http://www.thebryantadvantage.com), home of free CCNA and CCNP tutorials, The Ultimate CCNA Study Package, Ultimate CCNP Study Packages, and CCNA CBT video training. Pass the CCNA exam ,BSCI exam , and BCMSN exam with Chris Bryant, CCIE #12933!
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