CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
Whenever you’re working on your BCMSN Test on your approach to CCNP certification, you’ll browse at length regarding how Cisco routers and multilayer switches can function to supply router redundancy – but there’s Yet another valuable assistance, Server Load Balancing, that does exactly the same for servers. When HSRP, VRRP, and CLBP all depict numerous Actual physical routers to hosts as only one virtual router, SLB signifies a number of Actual physical servers to hosts as a single Digital server.
In the next instance, a few Actual physical servers are put to the SRB group ServFarm. They’re represented on the hosts since the Digital server 210.one.one.fourteen.
The hosts will find to communicate with the server at 210.one.one.fourteen, not being aware of that they’re really communicating 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 particular IP addresses from the servers in ServFarm.
The essential operations of SLB consists 먹튀검증 of generating the server farm, followed by developing the virtual server. We’ll very first increase 210.1.1.eleven to your server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# real 210.one.1.11
MLS(config-slb-real)# inservice
The 1st command generates the server farm, with the real command specifying the IP deal with of the true server. The inservice command is needed by SLB to consider the server as Completely ready to handle the server farm’s workload. The real and inservice commands really should be repeated for every server from the server farm.
To generate the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.one.1.14
MLS(config-slb-vserver)# inservice
Within the prime down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP handle 210.1.1.14, and connections are permitted as soon as the inservice command is utilized.
You might also want to control which of your network hosts can connect to the virtual server. If hosts or subnets are named Together with the consumer command, People would be the only purchasers that will connect to the virtual server. Note that this command uses wildcard masks. The following configuration would permit only the hosts about the subnet 210.1.one.0 /24 to hook up with the virtual server.
MLS(config-slb-vserver)# customer 210.one.one.0 0.0.0.255
SLB will be the server conclude’s response to HSRP, VRRP, and GLBP – but you still have to comprehend it to become a CCNP! Knowing redundancy approaches and protocols is important in right now’s networks, so be sure to’re at ease with SLB just before taking up the Examination.