CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Once you’re focusing on your BCMSN exam on the way to CCNP certification, you’ll go through at length regarding how Cisco routers and multilayer switches can perform to deliver router redundancy – but there’s Yet another valuable service, Server Load Balancing, that does precisely the same for servers. While HSRP, VRRP, and CLBP all signify multiple physical routers to hosts as only one virtual router, SLB signifies numerous physical servers to hosts as one virtual server.
In the subsequent instance, three Bodily servers have already been positioned into the SRB group ServFarm. They’re represented towards the hosts since the virtual server 210.1.1.fourteen.
The hosts will seek out to communicate with the server at 210.one.1.14, not realizing that they’re actually communicating with the routers in ServFarm. This permits swift cutover if among the Actual physical servers goes down, as well as serves to hide the 먹튀검증 actual IP addresses of the servers in ServFarm.
The fundamental functions of SLB involves creating the server farm, followed by creating the virtual server. We’ll initial include 210.1.one.11 on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# genuine 210.one.1.eleven
MLS(config-slb-authentic)# inservice
The first command creates the server farm, with the actual command specifying the IP deal with of the real server. The inservice command is necessary by SLB to think about the server as ready to manage the server farm’s workload. The actual and inservice commands should be repeated for every server within the server farm.
To make 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
From your top down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP tackle 210.1.one.14, and connections are permitted when the inservice command is used.
You might also want to regulate which of one's network hosts can connect with the virtual server. If hosts or subnets are named Together with the client command, All those will be the only consumers that can connect to the virtual server. Notice this command takes advantage of wildcard masks. The following configuration would make it possible for only the hosts about the subnet 210.1.one.0 /24 to connect with the virtual server.
MLS(config-slb-vserver)# customer 210.1.1.0 0.0.0.255
SLB could be the server stop’s response to HSRP, VRRP, and GLBP – but you continue to have to realize it to be a CCNP! Being aware of redundancy tactics and protocols is vital in now’s networks, so be sure you’re snug with SLB ahead of taking up the Test.