CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
When you’re working on your BCMSN Test on your own solution to CCNP certification, you’ll examine at duration about how Cisco routers and multilayer switches can get the job done to offer router redundancy – but there’s An additional valuable assistance, Server Load Balancing, that does the same for servers. Even though HSRP, VRRP, and CLBP all stand for many physical routers to hosts as an individual Digital router, SLB signifies many Actual physical servers to hosts as only one virtual server.
In the subsequent instance, 3 physical servers are actually positioned into your SRB team ServFarm. They’re represented into the hosts given that the virtual server 210.one.one.14.
The hosts will search for to talk to the server at 210.1.1.fourteen, not being aware of which they’re in fact speaking with the routers in ServFarm. This permits rapid cutover if one of several Bodily servers goes down, and in addition serves to hide the actual IP addresses from the servers in ServFarm.
The essential operations of SLB will involve making the server farm, followed by making the Digital server. We’ll first incorporate 210.1.one.11 towards the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.one.1.eleven
MLS(config-slb-real)# inservice
The first command generates the server farm, with the real command specifying the IP deal with of the true server. The inservice command is needed by SLB to evaluate the server as All set to handle the server farm’s workload. The true and inservice instructions needs to be repeated for every server inside the server farm. 먹튀검증
To develop the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.1.1.14
MLS(config-slb-vserver)# inservice
In the leading down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP handle 210.one.one.fourteen, and connections are permitted when the inservice command is utilized.
You may additionally want to regulate which of one's community hosts can connect to the Digital server. If hosts or subnets are named with the customer command, People would be the only clients that will connect to the virtual server. Note that this command employs wildcard masks. The next configuration would make it possible for only the hosts over the subnet 210.1.one.0 /24 to hook up with the virtual server.
MLS(config-slb-vserver)# shopper 210.1.one.0 0.0.0.255
SLB could be the server finish’s respond to to HSRP, VRRP, and GLBP – but you continue to should realize it to be a CCNP! Being aware of redundancy techniques and protocols is important in currently’s networks, so you should definitely’re cozy with SLB ahead of taking over the Examination.