CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
Any time you’re working on your BCMSN exam on your own way to CCNP certification, you’ll study at size about how Cisco routers and multilayer switches can do the job to supply router redundancy – but there’s An additional beneficial company, Server Load Balancing, that does a similar for servers. When HSRP, VRRP, and CLBP all characterize multiple physical routers to hosts as only one Digital router, SLB signifies multiple Bodily servers to hosts as an individual virtual server.
In the next instance, three Bodily servers have already been positioned into your SRB group ServFarm. They’re represented for the hosts as the Digital server 210.one.one.14.
The hosts will search for to talk to the server at 210.1.one.14, not knowing they’re in fact communicating Together with the routers in ServFarm. This allows rapid cutover if one of many Actual physical servers goes down, as well as serves to hide the particular 먹튀검증 IP addresses with the servers in ServFarm.
The fundamental functions of SLB consists of creating the server farm, followed by generating the Digital server. We’ll to start with incorporate 210.1.1.eleven into the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# authentic 210.1.one.11
MLS(config-slb-genuine)# inservice
The 1st command generates the server farm, with the real command specifying the IP deal with of the true server. The inservice command is necessary by SLB to consider the server as Prepared to handle the server farm’s workload. The actual and inservice commands should be repeated for each server while in the server farm.
To develop the Digital 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
Through the major down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP tackle 210.1.1.fourteen, and connections are permitted as soon as the inservice command is utilized.
You might also want to manage which of one's community hosts can connect with the Digital server. If hosts or subnets are named with the client command, those would be the only clientele that could hook up with the virtual server. Take note that this command makes use of wildcard masks. The following configuration would permit only the hosts on the subnet 210.1.one.0 /24 to connect to the Digital server.
MLS(config-slb-vserver)# shopper 210.one.one.0 0.0.0.255
SLB would be the server conclusion’s remedy to HSRP, VRRP, and GLBP – but you continue to need to understand it to become a CCNP! Understanding redundancy procedures and protocols is important in right now’s networks, so be sure to’re snug with SLB ahead of taking up the Examination.