CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
If you’re focusing on your BCMSN Test on your strategy to CCNP certification, you’ll read at duration about how Cisco routers and multilayer switches can operate to provide router redundancy – but there’s A different valuable provider, Server Load Balancing, that does precisely the same for servers. Whilst HSRP, VRRP, and CLBP all symbolize many Actual physical routers to hosts as one Digital router, SLB represents numerous physical servers to hosts as a single virtual server.
In the subsequent example, three Bodily servers have been positioned in the SRB group ServFarm. They’re represented to your hosts since the Digital server 210.one.1.14.
The hosts will look for to talk to the server at 210.1.1.fourteen, not figuring out they’re really speaking Together with the routers in ServFarm. This permits fast cutover if one of several physical servers goes down, 먹튀검증 and likewise serves to hide the actual IP addresses from the servers in ServFarm.
The fundamental operations of SLB includes building the server farm, accompanied by developing the virtual server. We’ll very first add 210.1.one.11 on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# true 210.one.1.11
MLS(config-slb-serious)# inservice
The 1st command makes the server farm, with the true command specifying the IP deal with of the true server. The inservice command is needed by SLB to take into account the server as Prepared to take care of the server farm’s workload. The actual and inservice commands needs to be recurring for each server in 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.fourteen
MLS(config-slb-vserver)# inservice
Through the major down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP deal with 210.one.one.fourteen, and connections are allowed when the inservice command is applied.
You may additionally want to manage which of the community hosts can hook up with the virtual server. If hosts or subnets are named Together with the client command, People will be the only shoppers that could connect with the Digital server. Be aware that this command utilizes wildcard masks. The next configuration would enable just the hosts about the subnet 210.1.one.0 /24 to connect to the Digital server.
MLS(config-slb-vserver)# client 210.one.1.0 0.0.0.255
SLB is the server close’s response to HSRP, VRRP, and GLBP – but you continue to need to comprehend it to be a CCNP! Recognizing redundancy procedures and protocols is important in these days’s networks, so make sure you’re cozy with SLB in advance of taking over the Examination.