CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
Any time you’re focusing on your BCMSN exam in your method to CCNP certification, you’ll read through at length about how Cisco routers and multilayer switches can operate to supply router redundancy – but there’s A different beneficial support, Server Load Balancing, that does the identical for servers. While HSRP, VRRP, and CLBP all characterize a number of physical routers to hosts as a single Digital router, SLB represents many physical servers to hosts as one virtual server.
In the next example, a few physical servers are already positioned to the SRB team ServFarm. They’re represented towards 토토사이트 the hosts given that the Digital server 210.1.one.14.
The hosts will request to communicate with the server at 210.one.1.fourteen, not being aware of that they’re really communicating Using the routers in ServFarm. This enables fast cutover if one of many Actual physical servers goes down, and likewise serves to cover the actual IP addresses from the servers in ServFarm.
The fundamental functions of SLB consists of producing the server farm, followed by building the Digital server. We’ll initially include 210.one.1.eleven towards the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.one.one.11
MLS(config-slb-genuine)# inservice
The main command produces the server farm, with the true command specifying the IP address of the real server. The inservice command is required by SLB to consider the server as All set to manage the server farm’s workload. The true and inservice commands really should be recurring for every 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 210.1.1.fourteen
MLS(config-slb-vserver)# inservice
Through the best down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The virtual server is assigned the IP deal with 210.1.one.fourteen, and connections are allowed after the inservice command is utilized.
You might also want to regulate which of your respective community hosts can hook up with the virtual server. If hosts or subnets are named Together with the customer command, These would be the only clientele that could connect with the virtual server. Note this command works by using wildcard masks. The subsequent configuration would let just the hosts about the subnet 210.one.1.0 /24 to connect with the Digital server.
MLS(config-slb-vserver)# customer 210.one.one.0 0.0.0.255
SLB is the server conclude’s response to HSRP, VRRP, and GLBP – but you continue to need to understand it to become a CCNP! Knowing redundancy procedures and protocols is vital in nowadays’s networks, so ensure you’re comfy with SLB in advance of taking on the exam.
