CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
If you’re engaged on your BCMSN Examination on your own approach to CCNP certification, you’ll read at length regarding how Cisco routers and multilayer switches can operate to provide router redundancy – but there’s A different handy service, Server Load Balancing, that does precisely the same for servers. When HSRP, VRRP, and CLBP all represent a number of physical routers to hosts as an individual virtual router, SLB signifies a number of Actual physical servers to hosts as just one virtual server.
In the next instance, three physical servers are already put to the SRB team ServFarm. They’re represented into the hosts as being the Digital server 210.one.1.fourteen.
The hosts will look for to communicate with the server at 210.1.one.fourteen, not recognizing they’re basically communicating With all the routers in ServFarm. This enables brief cutover if among the physical servers goes down, and also serves to cover the particular IP addresses from the servers in ServFarm.
The basic functions of SLB consists of generating the server farm, accompanied by producing the virtual server. We’ll initial add 210.one.1.eleven into the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.one.11
MLS(config-slb-serious)# inservice
The very first command 먹튀검증 makes the server farm, with the actual command specifying the IP deal with of the true server. The inservice command is needed by SLB to think about the server as Completely ready to manage the server farm’s workload. The true and inservice instructions needs to be recurring for each server while in the server farm.
To generate the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.one.one.14
MLS(config-slb-vserver)# inservice
Within the top rated down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The Digital server is assigned the IP tackle 210.one.1.14, and connections are allowed when the inservice command is utilized.
You may additionally want to control which of one's network hosts can connect with the Digital server. If hosts or subnets are named with the client command, These would be the only purchasers that will connect with the Digital server. Note that this command makes use of wildcard masks. The following configuration would allow just the hosts to the subnet 210.one.1.0 /24 to connect to the virtual server.
MLS(config-slb-vserver)# consumer 210.one.one.0 0.0.0.255
SLB is definitely the server end’s reply to HSRP, VRRP, and GLBP – but you continue to need to know it to be a CCNP! Being aware of redundancy procedures and protocols is important in these days’s networks, so ensure you’re cozy with SLB in advance of taking up the Examination.