CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
When you’re working on your BCMSN exam in your technique to CCNP certification, you’ll study at duration regarding how Cisco routers and multilayer switches can work to deliver router redundancy – but there’s another helpful service, Server Load Balancing, that does the identical for servers. Even though HSRP, VRRP, and CLBP all signify many physical routers to hosts as only one Digital router, SLB represents a number of Actual physical servers to hosts as one Digital server.
In the following example, a few Bodily servers happen to be positioned in the SRB group ServFarm. They’re represented on the hosts since the virtual server 210.one.1.14.
The hosts will find to talk to the server at 210.1.one.fourteen, not understanding they’re in fact communicating With all the routers in ServFarm. This allows speedy cutover if one of several Actual physical servers goes down, as well as serves to hide the actual IP addresses from the servers in ServFarm.
The fundamental operations of SLB consists of 토토사이트 creating the server farm, followed by producing the Digital server. We’ll initial incorporate 210.1.1.eleven towards the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# true 210.1.1.11
MLS(config-slb-true)# inservice
The first command makes the server farm, with the true command specifying the IP deal with of the true server. The inservice command is needed by SLB to evaluate the server as Prepared to deal with the server farm’s workload. The true and inservice instructions need to be recurring for each 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 210.1.one.fourteen
MLS(config-slb-vserver)# inservice
From the top down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP deal with 210.1.1.14, and connections are permitted when the inservice command is utilized.
You might also want to regulate which of your community hosts can hook up with the Digital server. If hosts or subnets are named Along with the consumer command, those would be the only clients that may connect to the virtual server. Note this command works by using wildcard masks. The following configuration would enable only the hosts to the subnet 210.one.one.0 /24 to hook up with the Digital server.
MLS(config-slb-vserver)# client 210.one.1.0 0.0.0.255
SLB will be the server stop’s answer to HSRP, VRRP, and GLBP – but you continue to really need to realize it to become a CCNP! Understanding redundancy methods and protocols is important in right now’s networks, so be sure you’re cozy with SLB before taking up the Test.