CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
After you’re working on your BCMSN exam in your technique to CCNP certification, you’ll read through at duration about how Cisco routers and multilayer switches can get the job done to offer router redundancy – but there’s another beneficial company, Server Load Balancing, that does precisely the same for servers. Though HSRP, VRRP, and CLBP all symbolize numerous Actual physical routers to hosts as a single Digital router, SLB represents several Actual physical servers to hosts as one Digital server.
In the next case in point, three Bodily servers have been positioned in the SRB team ServFarm. They’re represented into the hosts as the virtual server 210.1.one.14.
The hosts will search for 토토사이트 to communicate with the server at 210.1.1.14, not figuring out they’re truly speaking While using the routers in ServFarm. This enables rapid cutover if among the list of Bodily servers goes down, and also serves to cover the particular IP addresses in the servers in ServFarm.
The fundamental operations of SLB entails developing the server farm, accompanied by developing the Digital server. We’ll to start with include 210.one.one.eleven on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# real 210.one.1.11
MLS(config-slb-true)# inservice
The very first command creates the server farm, with the true command specifying the IP handle of the true 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 instructions ought to be recurring for each server inside the server farm.
To build the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.1.1.14
MLS(config-slb-vserver)# inservice
From your prime down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP handle 210.1.1.14, and connections are permitted when the inservice command is applied.
You may also want to regulate which of the network hosts can connect to the Digital server. If hosts or subnets are named While using the client command, People would be the only purchasers that can connect to the virtual server. Take note this command uses wildcard masks. The subsequent configuration would permit only the hosts around the subnet 210.1.1.0 /24 to hook up with the Digital server.
MLS(config-slb-vserver)# shopper 210.one.one.0 0.0.0.255
SLB could be the server end’s remedy to HSRP, VRRP, and GLBP – but you continue to need to understand it to become a CCNP! Recognizing redundancy approaches and protocols is significant in currently’s networks, so be sure you’re comfy with SLB before taking up the Examination.