CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
Whenever you’re engaged on your BCMSN Examination on your own way to CCNP certification, you’ll browse at size about how Cisco routers and multilayer switches can function to provide router redundancy – but there’s A further handy support, Server Load Balancing, that does the identical for servers. Though HSRP, VRRP, and CLBP all symbolize numerous Bodily routers to hosts as an individual virtual router, SLB signifies numerous physical servers to hosts as only one Digital server.
In the next example, three physical servers happen to be positioned in the SRB group ServFarm. They’re represented towards the hosts given that the Digital server 210.1.one.fourteen.
The hosts will find to talk to the server at 210.one.one.fourteen, not understanding they’re actually speaking Using the routers in ServFarm. This permits brief cutover if one of the Bodily servers goes down, and in addition serves to cover the actual IP addresses with the servers in ServFarm.
The fundamental functions of SLB includes developing the server farm, followed by making the virtual server. We’ll 1st include 210.one.1.11 towards the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# real 210.1.one.eleven
MLS(config-slb-genuine)# inservice
The very first 메이저사이트 command generates the server farm, with the real command specifying the IP tackle of the true server. The inservice command is needed by SLB to think about the server as Completely ready to https://www.washingtonpost.com/newssearch/?query=토토사이트 deal with the server farm’s workload. The real and inservice commands ought to be recurring for each server during the server farm.
To develop the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.1.one.fourteen
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.one.1.fourteen, and connections are authorized when the inservice command is utilized.
You might also want to control which of your respective community hosts can hook up with the Digital server. If hosts or subnets are named Using the client command, People will be the only shoppers which can connect to the Digital server. Observe this command employs wildcard masks. The following configuration would enable just the hosts within the subnet 210.1.one.0 /24 to hook up with the Digital server.
MLS(config-slb-vserver)# customer 210.one.one.0 0.0.0.255
SLB would be the server conclusion’s respond to to HSRP, VRRP, and GLBP – but you continue to must know it to be a CCNP! Being aware of redundancy tactics and protocols is important in these days’s networks, so ensure that you’re comfortable with SLB before taking on the exam.