CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
Any time you’re engaged on your BCMSN Test with your technique to CCNP certification, you’ll go through at duration about how Cisco routers and multilayer switches can perform to provide router redundancy – but there’s A different helpful assistance, Server Load Balancing, that does exactly the same for servers. When HSRP, VRRP, and CLBP all stand for numerous physical routers to hosts as one Digital router, SLB represents multiple Bodily servers to hosts as an individual virtual server.
In the next illustration, a few physical servers have already been placed in the 먹튀검증 SRB team ServFarm. They’re represented into the hosts as the virtual server 210.one.one.fourteen.
The hosts will request to communicate with the server at 210.one.1.fourteen, not figuring out they’re essentially communicating While using the routers in ServFarm. This enables speedy cutover if one of many Actual physical servers goes down, and likewise serves to cover the particular IP addresses from the servers in ServFarm.
The basic operations of SLB entails building the server farm, followed by creating the Digital server. We’ll to start with add 210.one.one.11 for the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.1.eleven
MLS(config-slb-real)# inservice
The 1st command creates the server farm, with the actual command specifying the IP tackle of the actual server. The inservice command is needed by SLB to think about the server as Completely ready to manage the server farm’s workload. The actual and inservice instructions need to be repeated for each server inside the server farm.
To create the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.one.1.14
MLS(config-slb-vserver)# inservice
With the top down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The Digital server is assigned the IP address 210.1.1.14, and connections are allowed after the inservice command is applied.
You may additionally want to regulate which of one's community hosts can connect with the Digital server. If hosts or subnets are named With all the customer command, People will be the only clientele that may connect to the virtual server. Notice this command employs wildcard masks. The next configuration would allow just the hosts to the subnet 210.one.one.0 /24 to hook up with the virtual server.
MLS(config-slb-vserver)# shopper 210.1.one.0 0.0.0.255
SLB would be the server end’s reply to HSRP, VRRP, and GLBP – but you continue to must understand it to be a CCNP! Being aware of redundancy tactics and protocols is significant in nowadays’s networks, so be sure to’re comfy with SLB right before taking up the exam.