CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
If you’re engaged on your BCMSN Test on your technique to CCNP certification, you’ll examine at length about how Cisco routers and multilayer switches can get the job done to deliver router redundancy – but there’s One more useful support, Server Load Balancing, that does precisely the same for servers. Although HSRP, VRRP, and CLBP all depict multiple physical routers to hosts as only one virtual router, SLB represents numerous Actual physical servers to hosts as only one virtual server.
In the next instance, three physical servers are actually placed in the SRB team ServFarm. They’re represented for the hosts as being the Digital server 210.one.one.14.
The hosts will seek out to talk to the server at 210.one.one.fourteen, not knowing which they’re in fact speaking Along with the routers in ServFarm. This permits fast cutover if among the list of physical servers goes down, and in addition serves to cover the actual IP addresses of your servers in ServFarm.
The basic operations of SLB entails generating the server farm, followed by building the Digital server. We’ll 1st insert 210.one.1.eleven for the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# serious 210.one.1.11
MLS(config-slb-true)# inservice
The initial command produces the server farm, with the real command specifying the IP handle of the real server. The inservice command is necessary by SLB to think about the server as Prepared to deal with the server farm’s workload. The actual and inservice instructions needs to be repeated for every server inside the server farm.
To create the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.one.one.fourteen
MLS(config-slb-vserver)# inservice
With the top down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP address 210.one.1.14, and connections are authorized when the inservice command is used.
You may additionally want to manage which of the network hosts can hook up with the virtual server. If hosts or subnets are named with the consumer command, These would be the only clientele that can connect to the virtual server. Observe that this command makes use of wildcard masks. The next configuration would permit only the hosts around the subnet 210.one.one.0 /24 to connect with the virtual server.
MLS(config-slb-vserver)# client 먹튀검증 210.1.one.0 0.0.0.255
SLB may be the server finish’s answer to HSRP, VRRP, and GLBP – but you continue to need to comprehend it to be a CCNP! Knowing redundancy methods and protocols is vital in these days’s networks, so ensure you’re comfy with SLB ahead of taking up the exam.