CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Once you’re working on your BCMSN Examination in your method to CCNP certification, you’ll read at length regarding how Cisco routers and multilayer switches can work to offer router redundancy – but there’s One more valuable company, Server Load Balancing, that does the exact same for servers. While HSRP, VRRP, and CLBP all signify various Actual physical routers to hosts as just one virtual router, SLB signifies various Bodily servers to hosts as an individual Digital server.
In the following case in point, a few Actual physical servers are already put into your SRB group ServFarm. They’re represented into the hosts as being the Digital server 210.one.one.14.
The hosts will search for to communicate with the server at 210.one.one.fourteen, not being aware of which they’re truly communicating with the routers in ServFarm. This permits brief cutover if among the list of physical servers goes down, and also serves to cover the actual IP addresses with the servers in ServFarm.
The essential functions of SLB will involve making the server farm, followed by creating the virtual server. We’ll initially insert 210.one.one.eleven towards the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.one.eleven
MLS(config-slb-real)# inservice
The very first command creates the server farm, with the true command specifying the IP address of the actual server. The inservice command is necessary by SLB to take into account the server as All set to handle the server farm’s workload. The true and inservice commands need to be recurring for each server inside the server farm.
To create the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.1.1.fourteen
MLS(config-slb-vserver)# inservice
With the best down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the 먹튀검증 IP address 210.one.1.fourteen, and connections are permitted as soon as the inservice command is used.
You might also want to manage which of your respective network hosts can connect to the Digital server. If hosts or subnets are named Together with the client command, All those would be the only shoppers which will connect with the Digital server. Notice this command employs wildcard masks. The following configuration would enable just the hosts to the subnet 210.1.1.0 /24 to connect with the Digital server.
MLS(config-slb-vserver)# customer 210.1.one.0 0.0.0.255
SLB will be the server end’s remedy to HSRP, VRRP, and GLBP – but you continue to really need to know it to become a CCNP! Knowing redundancy methods and protocols is significant in today’s networks, so make sure you’re cozy with SLB right before taking up the Examination.