CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Any time you’re engaged on your BCMSN Test on the way to CCNP certification, you’ll read through at length regarding how Cisco routers and multilayer switches can do the job to provide router redundancy – but there’s One more valuable services, Server Load Balancing, that does the same for servers. While HSRP, VRRP, and CLBP all depict multiple physical routers to hosts as an individual Digital router, SLB represents several Actual physical servers to hosts as a single virtual server.
In the next example, a few physical servers happen to be put into the SRB team ServFarm. They’re represented towards the hosts as being the Digital server 210.1.one.fourteen.
The hosts will find to communicate with the server 토토사이트 at 210.1.one.14, not recognizing which they’re truly speaking Using the routers in ServFarm. This enables quick cutover if on the list of Actual physical servers goes down, as well as serves to cover the actual IP addresses of your servers in ServFarm.
The essential functions of SLB consists of producing the server farm, followed by producing the Digital server. We’ll initial incorporate 210.one.1.11 to the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# genuine 210.one.one.eleven
MLS(config-slb-true)# inservice
The main command generates the server farm, with the true command specifying the IP address of the true server. The inservice command is necessary by SLB to take into account the server as All set to deal with the server farm’s workload. The real and inservice commands needs to be recurring for every server inside the server farm.
To develop the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.one.1.fourteen
MLS(config-slb-vserver)# inservice
With the leading down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP handle 210.1.1.14, and connections are permitted after the inservice command is applied.
You may additionally want to manage which of your respective community hosts can connect with the Digital server. If hosts or subnets are named With all the customer command, those would be the only clients that will connect to the virtual server. Note that this command uses wildcard masks. The following configuration would allow for just the hosts to the subnet 210.one.one.0 /24 to connect to the virtual server.
MLS(config-slb-vserver)# consumer 210.one.1.0 0.0.0.255
SLB would be the server finish’s solution to HSRP, VRRP, and GLBP – but you still should comprehend it to become a CCNP! Recognizing redundancy procedures and protocols is important in right now’s networks, so be sure to’re cozy with SLB before taking on the exam.