CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
If you’re working on your BCMSN exam on your own strategy to CCNP certification, you’ll study at duration about how Cisco routers and multilayer switches can get the job done to supply 먹튀검증 router redundancy – but there’s Yet another practical services, Server Load Balancing, that does a similar for servers. Although HSRP, VRRP, and CLBP all signify a number of Bodily routers to hosts as one Digital router, SLB represents many Actual physical servers to hosts as a single Digital server.
In the next instance, three Actual physical servers are already put to the SRB team ServFarm. They’re represented on the hosts as being the virtual server 210.1.1.14.
The hosts will look for to communicate with the server at 210.1.one.fourteen, not knowing they’re actually communicating Using the routers in ServFarm. This permits swift cutover if one of many Actual physical servers goes down, and in addition serves to hide the particular IP addresses from the servers in ServFarm.
The basic operations of SLB entails developing the server farm, accompanied by producing the virtual server. We’ll initial increase 210.1.one.11 towards the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# serious 210.1.1.11
MLS(config-slb-true)# inservice
The initial command results in the server farm, with the actual command specifying the IP address of the real server. The inservice command is required by SLB to evaluate the server as ready to take care of the server farm’s workload. The actual and inservice instructions really should be repeated for each server during 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)# virtual 210.one.1.14
MLS(config-slb-vserver)# inservice
Through the prime down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The virtual server is assigned the IP deal with 210.1.1.fourteen, and connections are authorized after the inservice command is used.
You might also want to manage which within your network hosts can connect with the virtual server. If hosts or subnets are named While using the client command, All those would be the only clientele that will connect with the virtual server. Be aware that this command utilizes wildcard masks. The next configuration would enable just the hosts about the subnet 210.1.1.0 /24 to hook up with the virtual server.
MLS(config-slb-vserver)# client 210.one.one.0 0.0.0.255
SLB could be the server conclusion’s solution to HSRP, VRRP, and GLBP – but you still ought to understand it to become a CCNP! Knowing redundancy techniques and protocols is significant in right now’s networks, so ensure you’re cozy with SLB in advance of taking up the Test.