CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Any time you’re working on your BCMSN Test on your way to CCNP certification, you’ll study at size regarding how Cisco routers and multilayer switches 먹튀검증 can do the job to provide router redundancy – but there’s A different useful provider, Server Load Balancing, that does the exact same for servers. Although HSRP, VRRP, and CLBP all symbolize various physical routers to hosts as a single virtual router, SLB represents various Bodily servers to hosts as a single virtual server.
In the following example, three physical servers have been put in to the SRB group ServFarm. They’re represented towards the hosts as the virtual server 210.one.1.14.
The hosts will look for to talk to the server at 210.1.1.fourteen, not being aware of they’re essentially communicating While using the routers in ServFarm. This allows brief cutover if on the list of physical servers goes down, and likewise serves to cover the particular IP addresses on the servers in ServFarm.
The fundamental operations of SLB involves building the server farm, followed by building the Digital server. We’ll very first incorporate 210.1.1.eleven to the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# true 210.one.one.eleven
MLS(config-slb-genuine)# inservice
The first command makes the server farm, with the true command specifying the IP tackle of the actual server. The inservice command is required by SLB to evaluate the server as ready to take care of the server farm’s workload. The real and inservice instructions should be repeated for every server inside the server farm.
To build the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.1.1.fourteen
MLS(config-slb-vserver)# inservice
From your top down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The virtual server is assigned the IP address 210.1.one.fourteen, and connections are permitted once the inservice command is used.
You might also want to regulate which of your respective community hosts can hook up with the Digital server. If hosts or subnets are named Using the shopper command, those will be the only shoppers which will connect with the virtual server. Observe this command utilizes wildcard masks. The next configuration would enable just the hosts to the subnet 210.one.one.0 /24 to connect with the Digital server.
MLS(config-slb-vserver)# client 210.1.one.0 0.0.0.255
SLB could be the server stop’s solution to HSRP, VRRP, and GLBP – but you still need to comprehend it to be a CCNP! Knowing redundancy procedures and protocols is important in currently’s networks, so be sure you’re snug with SLB just before taking on the Examination.