CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Once you’re engaged on your BCMSN Examination on your own strategy to CCNP certification, you’ll read at size regarding how Cisco routers and multilayer switches can do the job to deliver router redundancy – but there’s Yet another handy service, Server Load Balancing, that does a similar for servers. Even though HSRP, VRRP, and CLBP all characterize various physical routers to hosts as just one Digital router, SLB represents many physical servers to hosts as only one virtual server.
In the subsequent instance, three physical servers have been positioned into the SRB group ServFarm. They’re represented into the hosts as the virtual server 210.1.one.fourteen.
The hosts will seek to communicate with the server at 210.one.1.fourteen, not knowing which they’re essentially communicating With all the routers in ServFarm. This enables swift cutover if one of many physical servers goes down, and also serves to cover the particular IP addresses on the servers in ServFarm.
The fundamental operations of SLB includes generating the server farm, followed by developing the Digital server. We’ll initial include 210.one.1.eleven for the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# genuine 210.1.one.11
MLS(config-slb-actual)# inservice
The very first command generates the server farm, with the true command specifying the IP tackle of the real server. The inservice command is required by SLB to consider the server as All set to take care of the server farm’s workload. The true and inservice commands really should be recurring for each server inside 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 210.1.1.14
MLS(config-slb-vserver)# inservice
In the leading down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP address 210.one.one.fourteen, and connections are allowed after the inservice command is 먹튀검증 used.
You may also want to manage which of one's network hosts can connect to the Digital server. If hosts or subnets are named Using the client command, People would be the only shoppers that will connect to the virtual server. Take note this command makes use of wildcard masks. The subsequent configuration would enable only the hosts within the subnet 210.one.1.0 /24 to connect to the virtual server.
MLS(config-slb-vserver)# client 210.one.1.0 0.0.0.255
SLB could be the server finish’s remedy to HSRP, VRRP, and GLBP – but you continue to need to realize it to be a CCNP! Knowing redundancy methods and protocols is vital in right now’s networks, so you should definitely’re snug with SLB right before taking over the exam.