CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
If you’re engaged on your BCMSN Test with your method to CCNP certification, you’ll read at length regarding how Cisco routers and multilayer switches can function to deliver router redundancy – but there’s A further beneficial services, Server Load Balancing, that does the same for servers. Even though HSRP, VRRP, and CLBP all characterize numerous physical routers to hosts as a single Digital router, SLB signifies various Bodily servers to hosts as an individual virtual server.
In the following instance, 3 Actual physical servers are placed in the SRB team ServFarm. They’re represented to your hosts as being the Digital server 210.1.1.fourteen.
The hosts will find to talk to the server at 210.one.one.fourteen, not recognizing which they’re actually communicating Together with the routers in ServFarm. This allows quick cutover if one of several physical servers goes down, as well as serves to cover the particular IP addresses on the servers in ServFarm.
The basic operations of SLB involves developing the server farm, accompanied by building the Digital server. We’ll 1st include 210.1.one.11 into the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# authentic 210.1.one.11
MLS(config-slb-authentic)# inservice
The first command creates the server farm, with the true command specifying the IP tackle of the true server. The inservice command is required by SLB to evaluate the server as Completely ready to manage the server farm’s workload. The true and inservice instructions needs to be recurring for each server during 토토사이트 the server farm.
To create the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.1.one.14
MLS(config-slb-vserver)# inservice
With the leading down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP deal with 210.one.1.fourteen, and connections are permitted as soon as the inservice command is applied.
You may additionally want to regulate which of your respective community hosts can hook up with the Digital server. If hosts or subnets are named Together with the client command, Those people would be the only clientele which can hook up with the Digital server. Observe that this command makes use of wildcard masks. The subsequent configuration would allow for only the hosts on the subnet 210.one.one.0 /24 to connect to the Digital server.
MLS(config-slb-vserver)# consumer 210.one.1.0 0.0.0.255
SLB would be the server conclusion’s reply to HSRP, VRRP, and GLBP – but you still ought to understand it to become a CCNP! Understanding redundancy techniques and protocols is important in these days’s networks, so make sure you’re cozy with SLB just before taking over the exam.