CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
After you’re working on your BCMSN Examination in your technique to CCNP certification, you’ll study at duration regarding how Cisco routers and multilayer switches can operate to supply router redundancy – but there’s A further beneficial service, Server Load Balancing, that does the identical for servers. Though HSRP, VRRP, and CLBP all symbolize a number of Bodily routers to hosts as just one virtual router, SLB represents many Actual physical servers to hosts as just one virtual server.
In the next instance, three physical servers are actually placed into the SRB group ServFarm. They’re represented into the hosts given that the Digital server 210.1.one.14.
The hosts will search for to communicate with the server at 210.1.1.fourteen, not being aware of which they’re actually speaking Using the routers in ServFarm. This permits swift cutover if one of the physical servers goes down, as well as serves to hide the actual IP addresses from the servers in ServFarm.
The basic functions of SLB requires building the server farm, followed by producing the Digital server. We’ll initial increase 210.1.1.11 into the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# genuine 210.1.1.eleven
MLS(config-slb-real)# inservice
The first command generates the server farm, with the real command specifying the IP handle of the actual server. The inservice command is needed by SLB to think about the server as ready to handle the server farm’s workload. The real and inservice commands really should be recurring for every server from the server farm.
To generate the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.1.one.fourteen
MLS(config-slb-vserver)# inservice
Within the prime down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The Digital server is assigned the IP tackle 210.one.one.14, and connections are authorized when the inservice command is applied.
You may additionally want to control which of your community hosts can connect to the virtual server. If hosts or subnets are named with the shopper command, Individuals will be the only customers that will connect to the virtual server. Be aware 먹튀검증 that this command employs wildcard masks. The next configuration would permit only the hosts on the subnet 210.one.1.0 /24 to connect to the Digital server.
MLS(config-slb-vserver)# consumer 210.1.1.0 0.0.0.255
SLB would be the server conclusion’s respond to to HSRP, VRRP, and GLBP – but you still should comprehend it to be a CCNP! Being aware of redundancy tactics and protocols is vital in right now’s networks, so ensure you’re relaxed with SLB before taking up the exam.