CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Any time you’re focusing on your BCMSN Examination with your strategy to CCNP certification, you’ll study at size regarding how Cisco routers and multilayer switches can do the job to deliver router redundancy – but there’s A further practical provider, Server Load Balancing, that does the same for servers. Although HSRP, VRRP, and CLBP all symbolize several Bodily routers to hosts as just one virtual router, SLB represents many physical servers to hosts as only one Digital server.
In the next example, three Bodily servers have been put into your SRB group ServFarm. They’re represented on the hosts as the virtual server 210.1.1.14.
The hosts will seek out to communicate with the server at 210.one.1.fourteen, not figuring out which they’re in fact speaking Together with the routers in ServFarm. This enables brief cutover if one of several physical servers goes down, and in addition serves to cover the particular IP addresses from the servers in ServFarm.
The fundamental functions of SLB involves building the server farm, followed by producing the Digital server. We’ll first add 210.one.one.eleven for the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.one.eleven
MLS(config-slb-authentic)# inservice
The first command produces the server farm, with the true command specifying the IP address of the actual server. The inservice command is necessary by SLB to think about the server as All set to handle the server farm’s 먹튀검증 workload. The real and inservice commands need to be recurring for every server within 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 210.1.1.14
MLS(config-slb-vserver)# inservice
Through the prime down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The Digital server is assigned the IP address 210.one.1.14, and connections are authorized when the inservice command is utilized.
You may also want to manage which of the community hosts can hook up with the Digital server. If hosts or subnets are named Along with the client command, All those would be the only clientele that could connect with the virtual server. Take note this command works by using wildcard masks. The next configuration would allow just the hosts about the subnet 210.one.one.0 /24 to connect with the Digital server.
MLS(config-slb-vserver)# shopper 210.1.one.0 0.0.0.255
SLB will be the server finish’s reply to HSRP, VRRP, and GLBP – but you still must comprehend it to be a CCNP! Knowing redundancy techniques and protocols is important in now’s networks, so ensure that you’re at ease with SLB just before taking up the exam.
