CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
Any time you’re working on your BCMSN exam on the method to CCNP certification, you’ll examine at length about how Cisco routers and multilayer switches can do the job to supply router redundancy – but there’s A further beneficial provider, Server Load Balancing, that does exactly the same for servers. Though HSRP, VRRP, and CLBP all depict multiple Actual physical routers to hosts as just one virtual router, SLB signifies numerous Actual physical servers to hosts as only one virtual server.
In the subsequent instance, 3 Bodily servers are put into your SRB group ServFarm. They’re represented for the hosts because the virtual server 210.one.1.fourteen.
The hosts will request to talk to the server at 210.one.1.14, not figuring out which they’re basically speaking Together with the routers in ServFarm. This allows fast cutover if among the Actual physical servers goes down, and in addition serves to cover the particular IP addresses from the servers in ServFarm.
The fundamental functions of SLB includes making the server farm, accompanied by generating the virtual server. We’ll very first add 210.1.1.eleven on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# authentic 210.1.1.eleven
MLS(config-slb-actual)# inservice
The main command creates the server farm, with the actual command specifying the IP address of the true server. The inservice command is necessary by SLB to look at the server as Completely ready to handle the server farm’s workload. The true and inservice instructions need to be recurring for every server from 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)# virtual 210.1.one.14
MLS(config-slb-vserver)# inservice
From the major down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The Digital server is assigned the IP deal with 210.one.one.fourteen, and connections are permitted once the inservice command is applied.
You might also want to manage which of your network hosts can connect with the virtual server. If hosts or subnets are named with the customer command, People will be the only clientele which will hook up with the virtual server. Observe this command uses wildcard masks. 먹튀검증 The next configuration would enable just the hosts on http://www.bbc.co.uk/search?q=먹튀검증 the subnet 210.one.1.0 /24 to hook up with the virtual server.
MLS(config-slb-vserver)# shopper 210.1.1.0 0.0.0.255
SLB is the server close’s respond to to HSRP, VRRP, and GLBP – but you continue to have to realize it to be a CCNP! Being aware of redundancy techniques and protocols is important in nowadays’s networks, so make sure you’re comfy with SLB just before taking on the exam.