CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
If you’re working on your BCMSN Examination on your own method to CCNP certification, you’ll read through at duration about how Cisco routers and multilayer switches can operate to offer router redundancy – but there’s A further beneficial services, Server Load Balancing, that does precisely the same for servers. Though HSRP, VRRP, and CLBP all represent multiple physical routers to hosts as just one Digital router, SLB signifies multiple physical servers to hosts as just one Digital server.
In the next case in point, 3 Actual physical servers are put in to the SRB group ServFarm. They’re represented for the hosts as being the virtual server 210.one.one.fourteen.
The hosts will look for to talk to the server at 210.one.one.14, not recognizing that they’re basically communicating with the routers in ServFarm. This enables swift cutover if one of several Bodily servers goes down, and in addition serves to hide the particular IP addresses with the servers in ServFarm.
The basic functions of SLB consists of generating the server farm, followed by producing the Digital server. We’ll to start with insert 210.1.one.eleven on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.1.11
MLS(config-slb-genuine)# inservice
The first command produces the server farm, with the actual command specifying the IP deal with of the actual server. The inservice command is needed by SLB to look at the server as Prepared to handle the server farm’s workload. The real and inservice commands need to be recurring for each server in 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)# virtual 210.1.one.14
MLS(config-slb-vserver)# inservice
In the top rated down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The virtual server is assigned the IP address 210.1.1.fourteen, and connections are allowed once the inservice command is utilized.
You may also want to control which of your network hosts can connect to the Digital server. If hosts or subnets are named with the client command, Those people would be 토토사이트 the only clientele which can hook up with the Digital server. Note this command works by using wildcard masks. The following configuration would make it possible for only the hosts over the subnet 210.one.one.0 /24 to hook up with the Digital server.
MLS(config-slb-vserver)# client 210.1.one.0 0.0.0.255
SLB would be the server finish’s respond to to HSRP, VRRP, and GLBP – but you continue to really need to understand it to be a CCNP! Figuring out redundancy procedures and protocols is significant in right now’s networks, so you should definitely’re snug with SLB before taking up the Examination.