CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
After you’re working on your BCMSN Test on your own technique to CCNP certification, you’ll read through at duration regarding how Cisco routers and multilayer switches can function to provide router redundancy – but there’s A further beneficial services, Server Load Balancing, that does the exact same for servers. Whilst HSRP, VRRP, and CLBP all signify several Bodily routers to hosts as just one virtual router, SLB signifies a number of physical servers to hosts as a single Digital server.
In the following instance, 3 Bodily servers are actually positioned into your SRB group ServFarm. They’re represented on the hosts given that the virtual server 210.1.1.fourteen.
The hosts will find to talk to the server at 210.one.1.fourteen, not knowing they’re essentially speaking Along with the routers in ServFarm. This permits brief cutover if one of many physical servers goes down, as well as serves to cover the actual IP addresses of the servers in ServFarm.
The essential functions of SLB includes creating the 토토사이트 server farm, followed by creating the virtual server. We’ll 1st add 210.1.one.eleven to the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# authentic 210.1.one.eleven
MLS(config-slb-authentic)# inservice
The first command creates the server farm, with the real command specifying the IP handle of the real server. The inservice command is needed by SLB to look at the server as All set to take care of the server farm’s workload. The real and inservice commands really should be recurring for every server while in the server farm.
To develop 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
With the leading down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP deal with 210.one.1.fourteen, and connections are authorized when the inservice command is utilized.
You may also want to regulate which of the network hosts can hook up with the Digital server. If hosts or subnets are named With all the client command, Individuals would be the only customers that may connect with the virtual server. Notice this command utilizes wildcard masks. The following configuration would allow just the hosts to the subnet 210.1.1.0 /24 to connect with the Digital server.
MLS(config-slb-vserver)# client 210.one.1.0 0.0.0.255
SLB may be the server conclusion’s answer to HSRP, VRRP, and GLBP – but you continue to must understand it to become a CCNP! Realizing redundancy methods and protocols is vital in today’s networks, so ensure that you’re snug with SLB in advance of taking over the Test.