CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
When you’re engaged on your BCMSN Examination on your approach to CCNP certification, you’ll study at length about how Cisco routers and multilayer switches can perform to provide router redundancy – but there’s Yet another handy support, Server Load Balancing, that does the identical for servers. Though HSRP, VRRP, and CLBP all characterize numerous physical routers to hosts as just one virtual router, SLB signifies several Bodily servers to hosts as only one Digital server.
In the following instance, a few Bodily servers are positioned in to the SRB group ServFarm. They’re represented to the hosts because the virtual server 210.one.1.14.
The hosts will find to communicate with the server at 210.1.1.fourteen, not understanding that they’re in fact communicating with the routers in ServFarm. This allows quick cutover if on the list of Bodily servers goes down, and also serves to cover the particular IP addresses from the servers in ServFarm.
The fundamental operations of SLB entails building the server farm, accompanied by building the Digital server. We’ll 1st include 210.1.1.11 on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# authentic 210.1.one.eleven
MLS(config-slb-real)# inservice
The initial command generates the server farm, with the actual command specifying the IP tackle of the true server. The inservice command is needed by SLB to evaluate the server as All set to deal with the server farm’s workload. The true and inservice instructions really should be repeated 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
In the best down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP handle 210.1.1.fourteen, and connections are allowed once the inservice command is used.
You may additionally want to control which of your network hosts 토토사이트 can connect with the Digital server. If hosts or subnets are named Along with the customer command, those would be the only clientele that can connect to the virtual server. Be aware this command employs wildcard masks. The next configuration would enable only the hosts on the subnet 210.one.1.0 /24 to connect to the Digital server.
MLS(config-slb-vserver)# customer 210.one.one.0 0.0.0.255
SLB may be the server conclude’s answer to HSRP, VRRP, and GLBP – but you still must understand it to be a CCNP! Knowing redundancy methods and protocols is important in nowadays’s networks, so ensure you’re comfortable with SLB just before taking up the Test.