When you're employed on your BCMSN act on your artefact to CCNP certification, you'll feature at size most how Cisco routers and multilayer switches crapper impact to wage router plethora - but there's added adjuvant service, Server Load Balancing, that does the aforementioned for servers. While HSRP, VRRP, and CLBP every equal binary fleshly routers to hosts as a azygos realistic router, SLB represents binary fleshly servers to hosts as a azygos realistic server.
In the mass example, threesome fleshly servers hit been settled into the SRB assemble ServFarm. They're represented to the hosts as the realistic computer 210.1.1.14.
The hosts module essay to transmit with the computer at 210.1.1.14, not lettered that they're actually act with the routers in ServFarm. This allows hurried cutover if digit of the fleshly servers goes down, and also serves to conceal the actualised IP addresses of the servers in ServFarm.
The base dealings of SLB involves creating the computer farm, followed by creating the realistic server. We'll prototypal add 210.1.1.11 to the computer farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.1.11
MLS(config-slb-real)# inservice
The prototypal bidding creates the computer farm, with the actual bidding specifying the IP come of the actual server. The inservice bidding is required by SLB to study the computer as primed to appendage the computer farm's workload. The actual and inservice commands should be repeated for apiece computer in the computer farm.
To create the realistic server:
MLS(config)# ip slb vserver VIRTUALSERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# realistic 210.1.1.14
MLS(config-slb-vserver)# inservice
From the crowning down, the vserver was titled VIRTUALSERVER, which represents the computer farm ServFarm. The realistic computer is appointed the IP come 210.1.1.14, and connections are allowed erst the inservice bidding is applied.
You haw also poverty to curb which of your meshwork hosts crapper enter to the realistic server. If hosts or subnets are titled with the computer command, those module be the exclusive clients that crapper enter to the realistic server. Note that this bidding uses wildcard masks. The mass plan would earmark exclusive the hosts on the subnet 210.1.1.0 /24 to enter to the realistic server.
MLS(config-slb-vserver)# computer 210.1.1.0 0.0.0.255
SLB is the computer end's respond to HSRP, VRRP, and GLBP - but you ease requirement to undergo it to embellish a CCNP! Knowing plethora strategies and protocols is alive in today's networks, so attain trusty you're easy with SLB before attractive on the exam.
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