CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
If you’re engaged on your BCMSN exam on your own way to CCNP certification, you’ll read through at duration about how Cisco routers and multilayer switches can operate to offer router redundancy – but there’s A different helpful assistance, Server Load Balancing, that does a similar for servers. Though HSRP, VRRP, and CLBP all depict a number of physical routers to hosts as an individual Digital router, SLB represents many physical servers to hosts as an individual virtual server.
In the next instance, three Actual physical servers are actually put in the SRB team ServFarm. They’re represented into the hosts as being the Digital server 210.one.1.14.
The hosts will find to communicate with the server at 210.1.1.fourteen, not figuring out that they’re basically speaking While using the routers in ServFarm. This enables quick cutover if among the list of Bodily servers goes down, and likewise serves to hide the particular IP addresses on the servers in ServFarm.
The fundamental functions of SLB consists of producing the server farm, accompanied by making the Digital server. We’ll initially add 210.1.one.11 towards the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# true 210.1.one.11
MLS(config-slb-true)# inservice
The primary command generates the server farm, with the real command specifying the IP handle of the real server. The inservice command is needed by SLB to look at the server as Prepared to deal with the server farm’s workload. The actual and inservice commands should be repeated for every server during the server farm.
To create 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
In the top rated down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP handle 210.one.1.fourteen, and connections are authorized once the inservice command is used.
You might also want to control which of your respective network hosts can connect with the Digital server. If hosts or subnets are named Together with the client command, All 먹튀검증 those will be the only purchasers which will connect with the Digital server. Take note that this command utilizes wildcard masks. The following configuration would permit only the hosts over the subnet 210.one.1.0 /24 to connect with the Digital server.
MLS(config-slb-vserver)# shopper 210.1.1.0 0.0.0.255
SLB would be the server finish’s respond to to HSRP, VRRP, and GLBP – but you continue to should realize it to be a CCNP! Understanding redundancy procedures and protocols is important in currently’s networks, so ensure that you’re cozy with SLB in advance of taking up the Examination.