CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
If you’re engaged on your BCMSN Examination in your approach to CCNP certification, 안전놀이터 you’ll read at length about how Cisco routers and multilayer switches can do the job to supply router redundancy – but there’s One more valuable services, Server Load Balancing, that does exactly the same for servers. Even though HSRP, VRRP, and CLBP all symbolize multiple Bodily routers to hosts as a single virtual router, SLB represents multiple Actual physical servers to hosts as an individual Digital server.
In the following case in point, three physical servers happen to be placed to the SRB group ServFarm. They’re represented for the hosts as being the Digital server 210.1.1.fourteen.
The hosts will look for to communicate with the server at 210.1.one.fourteen, not being aware of they’re essentially communicating Along with the routers in ServFarm. This permits swift cutover if among the list of physical servers goes down, as well as serves to cover the actual IP addresses from the servers in ServFarm.
The essential functions of SLB entails making the server farm, accompanied by building the Digital server. We’ll initial add 210.1.one.eleven on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# genuine 210.one.1.eleven
MLS(config-slb-genuine)# inservice
The very first command produces the server farm, with the actual command specifying the IP handle of the real server. The inservice command is needed by SLB to take into account the server as http://www.bbc.co.uk/search?q=토토사이트 All set to handle the server farm’s workload. The actual and inservice commands needs 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)# Digital 210.1.1.14
MLS(config-slb-vserver)# inservice
From the top down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP deal with 210.one.one.14, and connections are authorized when the inservice command is used.
You might also want to control which of one's network hosts can connect to the Digital server. If hosts or subnets are named With all the shopper command, People will be the only shoppers which can hook up with the Digital server. Be aware this command utilizes wildcard masks. The subsequent configuration would allow for only the hosts to the subnet 210.one.one.0 /24 to connect to the virtual server.
MLS(config-slb-vserver)# customer 210.1.one.0 0.0.0.255
SLB would be the server conclusion’s reply to HSRP, VRRP, and GLBP – but you still need to understand it to become a CCNP! Figuring out redundancy approaches and protocols is vital in right now’s networks, so ensure you’re comfy with SLB just before taking up the exam.