CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
Whenever you’re engaged on your BCMSN exam in your method to CCNP certification, you’ll read through at length regarding how Cisco routers and multilayer switches can operate to supply router redundancy – but there’s One more practical services, Server Load Balancing, that does precisely the same for servers. Even though HSRP, VRRP, and CLBP all characterize multiple Actual physical routers to hosts as one Digital router, SLB represents various physical servers to hosts as an individual Digital server.
In the following instance, a few Actual physical servers are already put into the SRB group ServFarm. They’re represented to your hosts since the Digital server 210.1.1.fourteen.
The hosts will look for to talk to the server at 210.one.1.fourteen, not recognizing they’re basically speaking Together with the routers in ServFarm. This allows brief cutover if on the list of Bodily servers goes down, as well as serves to cover the actual IP addresses with the servers in ServFarm.
The essential operations of SLB entails creating the server farm, followed by creating the Digital server. We’ll very first incorporate 210.one.one.11 to your server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# genuine 210.one.1.11
MLS(config-slb-real)# inservice
The initial command generates the server farm, with the real command specifying the IP tackle of the real server. The inservice command is required by SLB to evaluate the server as Prepared to 토토사이트 take care of the server farm’s workload. The actual and inservice instructions must be repeated for every server within 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)# Digital 210.1.1.14
MLS(config-slb-vserver)# inservice
With the prime down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP handle 210.1.one.fourteen, and connections are authorized as soon as the inservice command is used.
You may also want to control which of one's community hosts can connect with the virtual server. If hosts or subnets are named with the client command, These would be the only clientele that can connect with the virtual server. Notice this command takes advantage of wildcard masks. The next configuration would enable only the hosts about the subnet 210.1.one.0 /24 to hook up with the Digital server.
MLS(config-slb-vserver)# shopper 210.1.1.0 0.0.0.255
SLB could be the server stop’s reply to HSRP, VRRP, and GLBP – but you continue to really need to comprehend it to become a CCNP! Recognizing redundancy approaches and protocols is important in nowadays’s networks, so be sure to’re relaxed with SLB prior to taking over the Examination.