CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
Once you’re working on your BCMSN exam on your own approach to CCNP certification, you’ll read at length regarding how Cisco routers and multilayer switches can do the job to offer router redundancy – but there’s A further beneficial assistance, Server Load Balancing, that does the exact same for servers. Whilst HSRP, VRRP, and CLBP all stand for many Actual physical routers to hosts as an individual virtual router, SLB signifies numerous physical servers to hosts as an individual Digital server.
In the following instance, a few physical servers are actually placed to the SRB team ServFarm. They’re represented to the hosts given that the Digital server 210.one.one.14.
The hosts will seek out to talk to the server at 210.1.1.14, not being aware of they’re basically speaking Together with the routers in ServFarm. This enables rapid cutover if on the list of Bodily servers goes down, and also serves to cover the actual IP addresses of the servers in ServFarm.
The fundamental operations of SLB involves generating the server 토토사이트 farm, followed by developing the virtual server. We’ll very first incorporate 210.1.one.eleven on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.one.one.eleven
MLS(config-slb-authentic)# inservice
The primary command produces the server farm, with the real command specifying the IP handle of the real server. The inservice command is needed by SLB to look at the server as Prepared to take care of the server farm’s workload. The true and inservice commands should be recurring for each server from the server farm.
To generate the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.1.one.14
MLS(config-slb-vserver)# inservice
Through the top down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The virtual server is assigned the IP address 210.1.one.fourteen, and connections are allowed when the inservice command is applied.
You might also want to control which of your community hosts can hook up with the Digital server. If hosts or subnets are named with the customer command, Those people would be the only shoppers that could connect to the virtual server. Observe that this command uses wildcard masks. The following configuration would enable just the hosts within the subnet 210.1.one.0 /24 to connect to the virtual server.
MLS(config-slb-vserver)# consumer 210.one.1.0 0.0.0.255
SLB will be the server close’s response to HSRP, VRRP, and GLBP – but you continue to should know it to be a CCNP! Being aware of redundancy methods and protocols is significant in nowadays’s networks, so be sure you’re at ease with SLB just before taking over the Examination.