CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
If you’re focusing on your BCMSN Test with your method to CCNP certification, you’ll go through at length about how Cisco routers and multilayer switches can do the job to provide router redundancy – but there’s another useful company, Server Load Balancing, that does exactly the same for servers. Even though HSRP, VRRP, and CLBP all signify multiple Bodily routers to hosts as just one Digital router, SLB signifies a number of physical servers to hosts as just one virtual server.
In the next example, three Bodily servers happen to be positioned into the SRB team ServFarm. They’re represented to your hosts because the Digital server 210.one.one.fourteen.
The hosts will find to communicate with the server at 210.one.one.fourteen, not knowing which they’re actually speaking Using the routers in ServFarm. This enables rapid cutover if one of many Actual physical servers goes down, and also serves to cover the particular IP addresses 토토사이트 of the servers in ServFarm.
The fundamental operations of SLB will involve producing the server farm, followed by creating the Digital server. We’ll 1st increase 210.one.1.eleven into the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# genuine 210.1.one.eleven
MLS(config-slb-authentic)# inservice
The first command makes the server farm, with the real command specifying the IP address of the real server. The inservice command is required by SLB to think about the server as ready to take care of the server farm’s workload. The actual 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)# Digital 210.one.1.14
MLS(config-slb-vserver)# inservice
With the leading down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP address 210.1.one.14, and connections are allowed after the inservice command is utilized.
You may also want to control which of your respective network hosts can hook up with the virtual server. If hosts or subnets are named with the customer command, those will be the only customers that could connect with the Digital server. Note that this command employs wildcard masks. The following configuration would allow for only the hosts over the subnet 210.1.one.0 /24 to connect to the Digital server.
MLS(config-slb-vserver)# shopper 210.one.1.0 0.0.0.255
SLB will be the server conclude’s remedy to HSRP, VRRP, and GLBP – but you continue to ought to realize it to become a CCNP! Realizing redundancy methods and protocols is vital in currently’s networks, so make sure you’re cozy with SLB prior to taking on the exam.