CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
After you’re engaged on your BCMSN Examination on your way to CCNP certification, you’ll browse at duration about how Cisco routers and multilayer switches can perform to offer router redundancy – but there’s An additional practical company, Server Load Balancing, that does the exact same for servers. When HSRP, VRRP, and CLBP all characterize several Actual physical routers to hosts as one virtual router, SLB signifies multiple Actual physical servers to hosts as one virtual server.
In the subsequent case in point, a few Actual physical servers happen to be placed into the SRB group ServFarm. They’re represented into the hosts because the Digital server 210.one.1.14.
The hosts will seek to communicate with the server at 210.1.one.fourteen, not being aware of which they’re essentially communicating With all the routers in ServFarm. This permits swift cutover if one of several Actual physical servers goes down, and also serves to hide the particular IP addresses of your servers in ServFarm.
The essential functions of SLB requires building the server farm, accompanied by making the virtual server. We’ll 1st include 210.one.1.11 into the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# real 210.1.one.eleven
MLS(config-slb-real)# inservice
The very first command produces the server farm, with the real command specifying the IP address of the real server. The inservice command is required by SLB to take into account the server as Prepared to take care of the server farm’s workload. The actual and inservice commands needs to be recurring for every server inside the server farm.
To develop the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.one.1.14
MLS(config-slb-vserver)# inservice
Within the top rated down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The virtual server is assigned the IP address 210.one.one.fourteen, and connections are 토토사이트 authorized once the inservice command is used.
You may also want to control which within your community hosts can hook up with the Digital server. If hosts or subnets are named Together with the consumer command, Individuals would be the only clientele that may connect to the Digital server. Observe that this command uses wildcard masks. The following configuration would permit just the hosts on the subnet 210.1.one.0 /24 to connect with the Digital server.
MLS(config-slb-vserver)# client 210.one.1.0 0.0.0.255
SLB may be the server conclude’s remedy to HSRP, VRRP, and GLBP – but you still ought to understand it to become a CCNP! Figuring out redundancy procedures and protocols is significant in today’s networks, so make sure you’re snug with SLB just before taking over the Examination.