CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
If you’re working on your BCMSN Test on the technique to CCNP certification, you’ll read through at length regarding how Cisco routers and multilayer switches can function to supply router redundancy – but there’s another helpful provider, Server Load Balancing, that does the exact same for servers. Even though HSRP, VRRP, and CLBP all depict various Actual physical routers to hosts as a single Digital router, SLB represents various Bodily servers to hosts as a single Digital server.
In the subsequent illustration, three Bodily servers are already put in to the SRB team ServFarm. They’re represented to your hosts as the Digital server 210.one.one.14.
The hosts will seek to talk to the server at 210.one.1.14, not figuring out that they’re essentially speaking Together with the routers in ServFarm. This enables rapid cutover if one of the physical servers goes down, and in addition serves to hide the particular IP addresses with the servers in ServFarm.
The essential operations of SLB consists of building the server farm, accompanied by making the Digital server. We’ll 1st increase 210.one.one.eleven into the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# serious 210.1.1.11
MLS(config-slb-real)# inservice
The primary command results in the server farm, with the true command specifying the IP address of the true server. The inservice command is required by SLB to look at the server as All set to take care of the server farm’s workload. The real and inservice instructions should be recurring for every server while in the server farm.
To build the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.one.1.fourteen
MLS(config-slb-vserver)# inservice
In the prime down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP tackle 210.1.1.fourteen, and connections are authorized once the inservice command is utilized.
You may also want to regulate which of your respective community hosts can connect with the virtual server. If hosts or subnets are named Along with the customer command, These will be the only clientele that could connect to the Digital server. Notice that this command takes advantage of wildcard masks. The following configuration would allow for only the hosts over the subnet 210.one.1.0 토토사이트 /24 to connect with the virtual server.
MLS(config-slb-vserver)# shopper 210.1.one.0 0.0.0.255
SLB is the server finish’s answer to HSRP, VRRP, and GLBP – but you still really need to know it to become a CCNP! Being aware of redundancy procedures and protocols is significant in these days’s networks, so ensure you’re relaxed with SLB right before taking on the Test.