CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
After you’re focusing on your BCMSN Examination in your technique to CCNP certification, you’ll examine at length about how Cisco routers and multilayer switches can work to offer router redundancy – but there’s One more useful company, Server Load Balancing, that does a similar for servers. While HSRP, VRRP, and CLBP all represent multiple physical routers to hosts as just one Digital router, SLB represents various Actual physical servers to hosts as only one virtual server.
In the next illustration, three Actual physical servers have already been put to the SRB group ServFarm. They’re represented on the hosts as the virtual server 210.one.1.14.
The hosts will seek out to communicate with the server at 210.1.1.14, not realizing which they’re essentially communicating Along with the routers in ServFarm. This allows swift cutover if among the list of Bodily servers goes down, and also serves to hide the particular IP addresses in the servers in ServFarm.
The fundamental functions of SLB requires making the server farm, accompanied by generating the Digital server. We’ll initially add 210.1.1.eleven to your server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# true 210.one.one.eleven
MLS(config-slb-actual)# inservice
The main command makes the server farm, with the actual command specifying the IP tackle of the true server. The inservice command is necessary by SLB to take into account the server as All set to manage the server farm’s workload. The actual and inservice commands need to be repeated for each server within the server farm.
To develop the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.1.1.fourteen
MLS(config-slb-vserver)# inservice
Within the best down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP handle 210.1.1.14, and connections are permitted as soon as the inservice command is used.
You may additionally want to manage which of the network hosts can connect with the Digital server. If hosts or subnets are named Together with the customer command, All those will be the only purchasers which can connect with the virtual server. Take note that this command employs wildcard masks. The subsequent configuration would enable only the hosts to the subnet 210.1.one.0 /24 to connect to the virtual server.
MLS(config-slb-vserver)# consumer 210.1.1.0 0.0.0.255
SLB will be the server finish’s response to HSRP, VRRP, and GLBP – but you still really need to realize it to become a 먹튀검증 CCNP! Realizing redundancy tactics and protocols is vital in right now’s networks, so be sure you’re at ease with SLB just before taking up the Examination.