CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Once you’re engaged on your BCMSN Examination on the approach to CCNP certification, you’ll study at size about how Cisco routers and multilayer switches can get the job done to supply router redundancy – but there’s An additional valuable provider, Server Load Balancing, that does the exact same for servers. Whilst HSRP, VRRP, and CLBP all signify a number of Actual physical routers to hosts as a single Digital router, SLB signifies many physical servers to hosts as only one Digital server.
In the following case in point, a few Actual physical servers have already been placed to the SRB group ServFarm. They’re represented into the hosts as the virtual server 210.one.one.14.
The hosts will seek to talk to the server at 210.one.1.fourteen, not understanding that they’re basically communicating While using the routers in ServFarm. This permits quick cutover if among the Bodily servers goes down, as well as serves to cover the particular IP addresses in the servers in ServFarm.
The fundamental operations of SLB requires making the server 먹튀검증 farm, accompanied by producing the virtual server. We’ll initial insert 210.1.one.eleven to the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.one.11
MLS(config-slb-actual)# inservice
The first command results in the server farm, with the true command specifying the IP tackle of the true server. The inservice command is required by SLB to look at the server as Completely ready to take care of the server farm’s workload. The real and inservice instructions need to be repeated for each server within the server farm.
To build the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.one.one.fourteen
MLS(config-slb-vserver)# inservice
From your top rated down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP handle 210.1.1.fourteen, and connections are permitted as soon as the inservice command is applied.
You might also want to manage which of the network hosts can hook up with the Digital server. If hosts or subnets are named Together with the client command, People would be the only consumers which can connect with the Digital server. Note this command makes use of wildcard masks. The next configuration would allow just the hosts around the subnet 210.1.one.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 stop’s respond to to HSRP, VRRP, and GLBP – but you still must realize it to become a CCNP! Knowing redundancy approaches and protocols is vital in now’s networks, so ensure you’re relaxed with SLB just before taking on the Test.