CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Any time you’re working on your BCMSN Test on the method to CCNP certification, you’ll read through at size about how Cisco routers and multilayer switches can function to provide router redundancy – but there’s One more useful company, Server Load Balancing, that does precisely the same for servers. When HSRP, VRRP, and CLBP all depict many Bodily routers to hosts as a single Digital router, SLB signifies various Bodily servers to hosts as only one Digital server.
In the next example, three Actual physical servers are put to the SRB team ServFarm. They’re represented towards the hosts as the Digital server 210.one.1.fourteen.
The hosts will search for to communicate 먹튀검증 with the server at 210.1.1.14, not understanding which they’re essentially speaking While using the routers in ServFarm. This permits quick cutover if one of several Actual physical servers goes down, and likewise serves to hide the particular IP addresses on the servers in ServFarm.
The essential operations of SLB consists of producing the server farm, followed by producing the virtual server. We’ll very first add 210.one.one.eleven to the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# authentic 210.1.one.11
MLS(config-slb-actual)# inservice
The initial command makes the server farm, with the actual command specifying the IP tackle of the actual server. The inservice command is necessary by SLB to look at the server as Prepared to handle the server farm’s workload. The actual and inservice commands must be repeated for each server in the server farm.
To create the Digital 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
Within the prime down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP address 210.1.1.fourteen, and connections are allowed when the inservice command is used.
You might also want to control which within your network hosts can connect with the virtual server. If hosts or subnets are named With all the shopper command, All those would be the only clientele that could connect to the virtual server. Notice this command makes use of wildcard masks. The following configuration would allow for only the hosts over the subnet 210.one.1.0 /24 to connect with the virtual server.
MLS(config-slb-vserver)# shopper 210.1.one.0 0.0.0.255
SLB would be the server conclude’s reply to HSRP, VRRP, and GLBP – but you still have to realize it to become a CCNP! Recognizing redundancy methods and protocols is vital in right now’s networks, so be sure to’re relaxed with SLB right before taking over the exam.