CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
After you’re focusing on your BCMSN exam on your own method to CCNP certification, you’ll read at length regarding how Cisco routers and multilayer switches can do the job to supply router redundancy – but there’s Yet another helpful service, Server Load Balancing, that does the exact same for servers. Even though HSRP, VRRP, and CLBP all depict many Bodily routers to hosts as only one Digital router, SLB signifies a number of Bodily servers to hosts as a single virtual server.
In the next illustration, 3 physical servers are already put in to the SRB team ServFarm. They’re represented into the hosts as the virtual server 210.1.1.14.
The hosts will seek to communicate with the server at 210.1.1.14, not understanding which they’re really speaking Along with the routers in ServFarm. This permits speedy cutover if among the list of Actual physical servers goes down, and also serves to cover the actual IP addresses of your servers in ServFarm.
The essential operations of SLB consists of producing the server farm, followed by producing the virtual server. We’ll 1st add 210.one.1.eleven for the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# real 210.one.1.eleven
MLS(config-slb-serious)# inservice
The initial command creates the server farm, with the actual command specifying the IP handle of the true server. The inservice command is required by SLB to evaluate the server as Completely ready to manage the server farm’s workload. The actual and inservice commands needs to be recurring for each server while in the server farm.
To create the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.one.one.fourteen
MLS(config-slb-vserver)# inservice
With the top down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The virtual server is assigned the IP deal with 210.1.one.14, and connections are permitted as soon as the inservice command is utilized.
You may also want to control which of your network hosts can hook up with the Digital server. If hosts or subnets are named Along with the consumer command, Individuals would be the only shoppers that could connect with the Digital server. Note this command uses wildcard masks. The next configuration would make it possible for just the hosts within the subnet 210.1.1.0 /24 to connect with the Digital server.
MLS(config-slb-vserver)# client 210.one.1.0 0.0.0.255
SLB is definitely the server end’s response to HSRP, VRRP, and GLBP – but you continue to really need to realize it to become a CCNP! Realizing redundancy methods and protocols is vital in today’s networks, so ensure you’re comfortable with SLB prior to taking up the 먹튀검증 exam.