CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
Once you’re engaged on your BCMSN Examination on your solution to CCNP certification, you’ll go through at size regarding how Cisco routers and multilayer switches can perform to provide router redundancy – but there’s Yet another handy assistance, Server Load Balancing, that does the same for servers. Although HSRP, VRRP, and CLBP all signify various Bodily routers to hosts as just one Digital router, SLB signifies multiple Bodily servers to hosts as a single virtual server.
In the next instance, 3 Actual physical servers are actually positioned to the SRB team ServFarm. They’re represented to the hosts given that the virtual server 210.one.one.fourteen.
The hosts will request to talk to the server at 210.1.1.14, not understanding they’re in fact communicating With all the routers in ServFarm. This allows speedy cutover if one of many Bodily servers goes down, and also serves to hide the actual IP addresses in the servers in ServFarm.
The fundamental functions of SLB includes building the server farm, accompanied by building the virtual server. We’ll 1st increase 210.1.one.11 into the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.one.1.11
MLS(config-slb-serious)# inservice
The 1st command makes the server farm, with the real command specifying the IP handle of the actual server. The inservice command is necessary by SLB to take into account the server as ready to take care of the server farm’s workload. The real and inservice commands need to be recurring for every server inside 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 210.1.1.14
MLS(config-slb-vserver)# inservice
From the top rated down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The virtual server is assigned the IP deal with 210.one.one.fourteen, 토토사이트 and connections are authorized when the inservice command is utilized.
You might also want to control which of one's community hosts can connect to the Digital server. If hosts or subnets are named Along with the customer command, People would be the only clients that may connect with the Digital server. Be aware this command takes advantage of wildcard masks. The subsequent configuration would allow for just the hosts on the subnet 210.1.one.0 /24 to connect with the virtual server.
MLS(config-slb-vserver)# customer 210.1.one.0 0.0.0.255
SLB is the server conclude’s reply to HSRP, VRRP, and GLBP – but you still ought to comprehend it to be a CCNP! Realizing redundancy tactics and protocols is significant in currently’s networks, so you should definitely’re cozy with SLB prior to taking up the exam.
