CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Once you’re working on your BCMSN Test in your method to CCNP certification, you’ll read at size about how Cisco routers and multilayer switches can function to 토토사이트 supply router redundancy – but there’s One more helpful provider, Server Load Balancing, that does the exact same for servers. Even though HSRP, VRRP, and CLBP all symbolize several physical routers to hosts as only one virtual router, SLB represents a number of Actual physical servers to hosts as just one virtual server.
In the next example, 3 Actual physical servers have been positioned in to the SRB team ServFarm. They’re represented on the hosts given that the virtual server 210.1.1.fourteen.
The hosts will search for to talk to the server at 210.1.1.fourteen, not being aware of they’re in fact speaking Using the routers in ServFarm. This allows brief cutover if among the Bodily servers goes down, in addition to serves to cover the particular IP addresses in the servers in ServFarm.
The fundamental operations of SLB consists of creating the server farm, accompanied by generating the virtual server. We’ll first include 210.one.1.eleven to the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# genuine 210.1.1.11
MLS(config-slb-true)# inservice
The 1st command generates the server farm, with the real command specifying the IP handle of the true server. The inservice command is necessary by SLB to take into account the server as Prepared to take care of the server farm’s workload. The real and inservice commands need to be recurring for every server in 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.one.one.fourteen
MLS(config-slb-vserver)# inservice
With the major down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The virtual server is assigned the IP address 210.one.one.14, and connections are authorized after the inservice command is used.
You may also want to control which of your network hosts can connect to the Digital server. If hosts or subnets are named With all the client command, People would be the only purchasers which can connect to the virtual server. Observe that this command employs wildcard masks. The following configuration would enable only the hosts within the subnet 210.1.one.0 /24 to hook up with the Digital server.
MLS(config-slb-vserver)# customer 210.one.one.0 0.0.0.255
SLB will be the server conclude’s answer to HSRP, VRRP, and GLBP – but you still should know it to be a CCNP! Realizing redundancy approaches and protocols is significant in currently’s networks, so be sure you’re relaxed with SLB right before taking on the Examination.