CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
After you’re engaged on your BCMSN Test on the solution to CCNP certification, you’ll read at size about how Cisco routers and multilayer switches can get the job done to deliver router redundancy – but there’s another beneficial services, Server Load Balancing, that does the identical for servers. While HSRP, VRRP, and CLBP all depict many Actual physical routers to hosts as an individual virtual router, SLB represents several Bodily servers to hosts as only one virtual server.
In the subsequent illustration, three physical servers happen to be positioned in to the SRB team ServFarm. They’re represented for the hosts as the virtual server 210.1.one.14.
The hosts will look for to talk to the 토토사이트 server at 210.1.one.fourteen, not understanding that they’re in fact speaking Together with the routers in ServFarm. This permits rapid cutover if one of several Actual physical servers goes down, and also serves to cover the actual IP addresses of the servers in ServFarm.
The essential functions of SLB involves producing the server farm, followed by producing the Digital server. We’ll 1st increase 210.one.one.11 on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.one.11
MLS(config-slb-actual)# inservice
The very first command generates the server farm, with the actual command specifying the IP tackle of the true server. The inservice command is needed by SLB to evaluate the server as All set to deal with the server farm’s workload. The actual and inservice instructions must be recurring for every server while in the server farm.
To produce the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.1.one.14
MLS(config-slb-vserver)# inservice
With the best down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP address 210.one.1.fourteen, and connections are allowed after the inservice command is used.
You may also want to regulate which of one's community hosts can connect to the virtual server. If hosts or subnets are named with the shopper command, Individuals would be the only customers which will hook up with the virtual server. Notice that this command works by using wildcard masks. The following configuration would allow just the hosts about the subnet 210.one.1.0 /24 to connect with the virtual server.
MLS(config-slb-vserver)# customer 210.1.1.0 0.0.0.255
SLB would be the server stop’s remedy to HSRP, VRRP, and GLBP – but you still ought to comprehend it to become a CCNP! Recognizing redundancy techniques and protocols is significant in these days’s networks, so make sure you’re comfortable with SLB just before taking up the Examination.