CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
Once you’re working on your BCMSN Examination in your 토토사이트 method to CCNP certification, you’ll examine at length about how Cisco routers and multilayer switches can perform to supply router redundancy – but there’s another useful company, Server Load Balancing, that does precisely the same for servers. Though HSRP, VRRP, and CLBP all signify several Actual physical routers to hosts as only one virtual router, SLB signifies various Actual physical servers to hosts as only one virtual server.
In the subsequent instance, three Bodily servers have already been put into your SRB group ServFarm. They’re represented into the hosts since the virtual server 210.one.one.fourteen.
The hosts will request to talk to the server at 210.1.one.fourteen, not figuring out which they’re basically communicating Using the routers in ServFarm. This allows fast cutover if one of the physical servers goes down, in addition to serves to hide the actual IP addresses from the servers in ServFarm.
The fundamental operations of SLB entails producing the server farm, accompanied by developing the Digital server. We’ll 1st add 210.1.one.11 on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# true 210.1.1.eleven
MLS(config-slb-actual)# inservice
The very first command makes the server farm, with the actual command specifying the IP address of the true server. The inservice command is required by SLB to consider the server as ready to deal with the server farm’s workload. The real and inservice instructions really should be repeated for every server in the server farm.
To develop the virtual 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
Through the top down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP tackle 210.one.1.fourteen, and connections are permitted when the inservice command is used.
You might also want to regulate which within your network hosts can connect with the virtual server. If hosts or subnets are named Along with the client command, These would be the only clientele which can hook up with the virtual server. Observe that this command uses wildcard masks. The next configuration would enable just the hosts over the subnet 210.1.1.0 /24 to hook up with the Digital server.
MLS(config-slb-vserver)# consumer 210.1.one.0 0.0.0.255
SLB is the server end’s reply to HSRP, VRRP, and GLBP – but you continue to must comprehend it to become a CCNP! Recognizing redundancy tactics and protocols is significant in nowadays’s networks, so be sure to’re comfortable with SLB prior to taking up the exam.