CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
When you’re focusing on your BCMSN Examination on your own method to CCNP certification, you’ll examine at duration regarding how Cisco routers and multilayer switches can perform to provide router redundancy – but there’s A further useful services, Server Load Balancing, that does the identical for servers. While 토토사이트 HSRP, VRRP, and CLBP all symbolize a number of physical routers to hosts as an individual Digital router, SLB signifies many physical servers to hosts as one Digital server.
In the following illustration, 3 physical servers are already placed in to the SRB team ServFarm. They’re represented to the hosts given that the virtual server 210.1.1.fourteen.
The hosts will seek to communicate with the server at 210.one.1.fourteen, not realizing that they’re actually speaking While using the routers in ServFarm. This enables brief cutover if among the list of Actual physical servers goes down, and likewise serves to cover the actual IP addresses from the servers in ServFarm.
The essential operations of SLB involves making the server farm, followed by developing the Digital server. We’ll to start with incorporate 210.one.1.11 to your server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# real 210.1.one.11
MLS(config-slb-genuine)# inservice
The 1st command produces the server farm, with the real command specifying the IP deal with of the true server. The inservice command is necessary by SLB to look at the server as Prepared to manage the server farm’s workload. The true and inservice instructions must be recurring for each server from 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.one.14
MLS(config-slb-vserver)# inservice
From the best down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP tackle 210.1.1.14, and connections are permitted after the inservice command is applied.
You might also want to regulate which of your community hosts can hook up with the virtual server. If hosts or subnets are named Together with the client command, People would be the only shoppers that will connect to the Digital server. Take note this command works by using wildcard masks. The subsequent configuration would enable only the hosts around the subnet 210.1.1.0 /24 to hook up with the Digital server.
MLS(config-slb-vserver)# client 210.1.one.0 0.0.0.255
SLB is definitely the server finish’s reply to HSRP, VRRP, and GLBP – but you still have to understand it to be a CCNP! Being aware of redundancy methods and protocols is significant in now’s networks, so be sure you’re relaxed with SLB just before taking up the exam.