CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
After you’re working on your BCMSN Examination on your approach to CCNP certification, you’ll read at duration regarding how Cisco routers and multilayer switches can function to provide router redundancy – but there’s another handy provider, Server Load Balancing, that does the identical for servers. While HSRP, VRRP, and CLBP all symbolize many physical routers to hosts as just one Digital router, SLB represents numerous Bodily servers to hosts as just one virtual server.
In the subsequent case in point, a few physical servers are positioned to the SRB group ServFarm. They’re represented into the hosts since the virtual server 210.one.one.fourteen.
The hosts will look for to communicate with the server at 210.one.1.14, not being aware of they’re actually speaking Together with the routers in ServFarm. This enables speedy cutover if one of many Actual physical servers goes down, in addition to serves to cover the particular IP addresses on the servers in ServFarm.
The basic functions of SLB consists of creating the server farm, accompanied by generating the virtual server. We’ll 1st incorporate 210.one.one.eleven into the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# true 210.1.1.eleven
MLS(config-slb-authentic)# inservice
The primary command creates the server farm, with the true command specifying the IP tackle of the actual server. The inservice command is needed by SLB to consider the server as Prepared to deal with the server farm’s workload. The actual and inservice commands must be repeated for each server from 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)# Digital 210.1.1.14
MLS(config-slb-vserver)# inservice
In the top rated down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP tackle 210.1.one.fourteen, and connections are authorized when the inservice command is applied.
You may additionally want to control which of your community hosts can hook up with the virtual server. If hosts or subnets are named with the consumer command, those would be the only clients that will connect with the Digital server. Observe this command uses wildcard masks. The following configuration would allow 토토사이트 for only the hosts over the subnet 210.one.one.0 /24 to connect to the virtual server.
MLS(config-slb-vserver)# client 210.one.1.0 0.0.0.255
SLB is the server end’s response to HSRP, VRRP, and GLBP – but you still have to comprehend it to be a CCNP! Recognizing redundancy procedures and protocols is vital in currently’s networks, so make sure you’re at ease with SLB right before taking on the Examination.