CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
After you’re engaged on your BCMSN Examination on the strategy to CCNP certification, you’ll read through at size about how Cisco routers and multilayer switches can get the job done to offer router redundancy – but there’s A further beneficial company, Server Load Balancing, that does precisely the same for servers. When HSRP, VRRP, and CLBP all signify a number of Bodily routers to hosts as an individual Digital router, SLB signifies many Actual physical servers to hosts as an individual Digital server.
In the next case in point, a few Bodily servers are put in the SRB group ServFarm. They’re represented to the hosts as being the virtual server 210.1.one.14.
The hosts will seek out to communicate with the server at 210.one.1.14, not realizing that they’re essentially speaking While using the routers in ServFarm. This allows fast cutover if one of several physical servers goes down, and in addition serves to hide the actual IP addresses of your servers in ServFarm.
The basic operations of SLB involves developing the server farm, accompanied by developing the Digital 먹튀검증 server. We’ll 1st include 210.one.one.eleven for the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# authentic 210.one.1.11
MLS(config-slb-true)# inservice
The main command produces the server farm, with the actual command specifying the IP handle of the real server. The inservice command is necessary by SLB to think about the server as Completely ready to deal with the server farm’s workload. The true and inservice commands needs to be recurring for every server inside the server farm.
To generate the virtual 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 signifies the server farm ServFarm. The virtual server is assigned the IP deal with 210.one.one.14, and connections are permitted once the inservice command is utilized.
You may also want to manage which of the network hosts can connect to the virtual server. If hosts or subnets are named While using the consumer command, People would be the only clientele that will connect to the Digital server. Note that this command employs wildcard masks. The subsequent configuration would enable just the hosts on the subnet 210.1.1.0 /24 to hook up with the Digital server.
MLS(config-slb-vserver)# client 210.one.one.0 0.0.0.255
SLB is definitely the server conclude’s reply to HSRP, VRRP, and GLBP – but you continue to must comprehend it to become a CCNP! Recognizing redundancy strategies and protocols is important in right now’s networks, so be sure you’re cozy with SLB right before taking on the exam.