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

April 8, 2013 robot Uncategorized

When you are working on your BCMSN test on your way to CCNP certification, you’ll read at length about how exactly Cisco routers and multilayer turns can work to offer modem redundancy – but there is another valuable company, Server Load Balancing, that does the exact same for hosts. While HSRP, VRRP, and CLBP all represent multiple physical routers to as a single virtual modem hosts, multiple physical servers are represented by SLB to hosts as a single virtual server.

In these example, three actual hosts have already been put into the SRB group ServFarm. They are represented to the hosts while the virtual server 210.1.1.14.

The hosts may seek to communicate with the host at 210.1.1.14, unsure that they are really talking with the hubs in ServFarm. Quick cutover is allowed by this if one of the physical servers falls, and also serves to cover the specific IP addresses of the servers in ServFarm.

The essential procedures of SLB requires creating the server farm, accompanied by creating the virtual server. We’ll first put 210.1.1.11 to the server farm:

MLS( config )# ip address slb serverfarm ServFarm

MLS( config-slb-sfarm )# real 210.1.1.11

MLS( config-slb-real )# inservice

The server farm is created by the first command, with the real command specifying the INTERNET protocol address of the real server. The inservice command is required by SLB to think about the server as prepared to handle the server farm’s work. The inservice and real orders ought to be repeated for each server in the server farm.

To create the digital server:

MLS( config )# ip slb vserver VIRTUAL_SERVER

MLS( config-slb-vserver )# serverfarm ServFarm

MLS( config-slb-vserver )# virtual 210.1.1.14

MLS( config-slb-vserver )# inservice

From the most effective down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual host is assigned the IP 210.1.1.14, and after the inservice order is applied associations are allowed.

You may even desire to control which of your network hosts can connect with the virtual server. If hosts or subnets are named with the client order, these could be the only clients that can hook up to the virtual machine. Observe that this command uses wildcard markers. The following configuration will allow only the hosts on the subnet 210.1.1.0 /24 for connecting to the virtual machine.

MLS( config-slb-vserver )# consumer 210.1.1.0 0.0.0.255

SLB could be the machine end’s response to HSRP, VRRP, and GLBP – however, you still need to know it to become CCNP! Understanding redundancy methods and methods is vital in the present systems, so make sure you are comfortable with SLB before taking on the assessment.VMhosts is a technology focused company. We provide high performing solutions at realistic prices. Our openness and flexibility allow us to provide a solution that exceeds your requirements and expectations.

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