CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Any time you’re focusing on your BCMSN Test on your own way to CCNP certification, you’ll study at duration about how Cisco routers and multilayer switches can get the job done to offer router redundancy – but there’s A further beneficial assistance, Server Load Balancing, that does the exact same for servers. Although HSRP, VRRP, and CLBP all symbolize multiple Bodily routers to hosts as just one Digital router, SLB signifies multiple Actual physical servers to hosts as one Digital server.
In the next instance, three Bodily servers happen to be put in to the SRB group ServFarm. They’re represented towards the hosts given that the Digital server 210.one.one.14.
The hosts will look for to talk to the server at 210.one.1.fourteen, not understanding that they’re in fact communicating with the routers in ServFarm. This enables speedy cutover if among the list of physical servers goes down, in addition to serves to cover the particular IP addresses on the servers in ServFarm.
The basic operations of SLB requires building the server farm, accompanied by generating the virtual server. We’ll to start with insert 210.1.one.eleven on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# serious 210.one.1.11
MLS(config-slb-authentic)# inservice
The first command makes the server farm, with the real command specifying the IP deal with of the true server. The inservice command is required by SLB to consider the server as ready to handle the server farm’s workload. The true and inservice commands ought to be repeated for each server inside 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.1.14
MLS(config-slb-vserver)# inservice
In the major down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP tackle 210.1.1.14, and connections are permitted once the inservice command is utilized.
You may additionally want to control which within your community hosts can connect with the Digital server. If hosts or subnets are named Together with the consumer command, All those would be the only clientele which will hook up with 토토사이트 the virtual server. Be aware that this command employs wildcard masks. The next configuration would make it possible for just the hosts within the subnet 210.one.1.0 /24 to hook up with the Digital server.
MLS(config-slb-vserver)# client 210.one.one.0 0.0.0.255
SLB is the server close’s remedy to HSRP, VRRP, and GLBP – but you continue to must understand it to become a CCNP! Knowing redundancy approaches and protocols is important in nowadays’s networks, so be sure you’re snug with SLB just before taking up the Test.