CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
Once you’re engaged on your BCMSN exam with your technique to CCNP certification, you’ll read through at length about how Cisco routers and multilayer switches can operate to deliver router redundancy – but there’s A further helpful services, Server Load Balancing, that 토토사이트 does precisely the same for servers. Although HSRP, VRRP, and CLBP all stand for numerous physical routers to hosts as only one Digital router, SLB represents numerous physical servers to hosts as only one virtual server.
In the subsequent case in point, three Bodily servers have already been put into the SRB team ServFarm. They’re represented to the hosts as the virtual server 210.one.1.14.
The hosts will search for to communicate with the server at 210.one.1.14, not understanding which they’re truly communicating Together with the routers in ServFarm. This allows quick cutover if on the list of physical servers goes down, and in addition serves to cover the actual IP addresses on the servers in ServFarm.
The fundamental operations of SLB will involve building the server farm, accompanied by generating the virtual server. We’ll first insert 210.1.1.11 for the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# real 210.one.1.11
MLS(config-slb-true)# inservice
The primary command makes the server farm, with the real command specifying the IP tackle of the true server. The inservice command is needed by SLB to take into account the server as All set to deal with the server farm’s workload. The real and inservice commands need to be repeated for each server during the server farm.
To produce the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.1.one.14
MLS(config-slb-vserver)# inservice
From your top down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The virtual server is assigned the IP handle 210.1.one.14, and connections are allowed after the inservice command is used.
You may also want to manage which of one's network hosts can connect with the Digital server. If hosts or subnets are named Together with the consumer command, Individuals will be the only customers which can connect to the Digital server. Observe that this command employs wildcard masks. The following configuration would make it possible for just the hosts over the subnet 210.1.1.0 /24 to connect to the Digital server.
MLS(config-slb-vserver)# client 210.1.one.0 0.0.0.255
SLB is the server conclude’s reply to HSRP, VRRP, and GLBP – but you still need to realize it to be a CCNP! Realizing redundancy procedures and protocols is significant in now’s networks, so be sure to’re at ease with SLB in advance of taking up the exam.