CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
Once you’re focusing on your BCMSN exam on the approach to CCNP certification, you’ll read through at size regarding how Cisco routers and multilayer switches can function to supply router redundancy – but there’s Yet another practical service, Server Load Balancing, that does precisely the same for servers. When HSRP, VRRP, and CLBP all signify several Bodily routers to hosts as just one Digital 토토사이트 router, SLB signifies multiple Actual physical servers to hosts as just one Digital server.
In the following example, 3 Actual physical servers are already placed to the SRB team ServFarm. They’re represented to your hosts given that the virtual server 210.one.1.fourteen.
The hosts will look for to talk to the server at 210.one.1.14, not realizing which they’re in fact communicating with the routers in ServFarm. This permits fast cutover if among the physical servers goes down, in addition to serves to cover the actual IP addresses of your servers in ServFarm.
The essential operations of SLB entails generating the server farm, accompanied by creating the Digital server. We’ll first increase 210.1.1.eleven to your server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.one.11
MLS(config-slb-serious)# inservice
The main command results in the server farm, with the true command specifying the IP handle of the actual server. The inservice command is needed by SLB to evaluate the server as All set to take care of the server farm’s workload. The true and inservice instructions ought to be recurring for every server while in the server farm.
To make the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.1.one.14
MLS(config-slb-vserver)# inservice
With the top rated down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP tackle 210.1.one.14, and connections are permitted after the inservice command is applied.
You may also want to manage which of your community hosts can connect with the Digital server. If hosts or subnets are named Together with the shopper command, All those will be the only customers that may connect to the Digital server. Observe that this command uses wildcard masks. The next configuration would let just the hosts to the subnet 210.1.one.0 /24 to connect to the virtual server.
MLS(config-slb-vserver)# client 210.1.1.0 0.0.0.255
SLB will be the server finish’s answer to HSRP, VRRP, and GLBP – but you still need to understand it to become a CCNP! Figuring out redundancy procedures and protocols is significant in currently’s networks, so you should definitely’re relaxed with SLB just before taking over the Test.
