CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
If you’re engaged on your BCMSN exam in your method to CCNP certification, you’ll read at size about how Cisco routers and multilayer switches can work to deliver router redundancy – but there’s A different helpful services, Server Load Balancing, that does a similar for servers. Whilst HSRP, VRRP, and CLBP all signify various Bodily routers to hosts as just one Digital router, SLB represents various Bodily servers to hosts as a single virtual server.
In the following example, three physical servers are already positioned in to the SRB team ServFarm. They’re represented into the hosts as the virtual server 210.1.1.14.
The hosts will search for to communicate with the server at 210.1.one.14, not knowing they’re in fact communicating Together with the routers in ServFarm. This enables swift cutover if on the list of Actual physical servers goes down, and in addition serves to hide the particular IP addresses from the servers in ServFarm.
The basic functions of SLB involves building the server farm, followed by producing the Digital server. We’ll very first incorporate 210.1.1.eleven to the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# authentic 210.1.1.eleven
MLS(config-slb-genuine)# inservice
The main command produces the server farm, with the true command specifying the IP handle of the actual server. The inservice command is needed by SLB to consider the server as All set to manage the server farm’s workload. The actual and inservice instructions must be repeated for every server inside the server farm.
To develop the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.1.one.fourteen
MLS(config-slb-vserver)# inservice
From the top down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The Digital server is assigned the IP handle 210.1.1.fourteen, and connections are authorized once the inservice command is used.
You may also want to control which of one's network hosts can hook up with the virtual server. If hosts or subnets are named While using the customer command, All those would be the only purchasers that could connect with the Digital server. Be aware this command employs wildcard masks. The following configuration would enable just the hosts on the subnet 210.one.1.0 /24 to hook up with the virtual server.
MLS(config-slb-vserver)# customer 210.1.1.0 0.0.0.255
SLB may be the server 먹튀검증 close’s answer to HSRP, VRRP, and GLBP – but you continue to should know it to become a CCNP! Knowing redundancy approaches and protocols is vital in today’s networks, so make sure you’re relaxed with SLB ahead of taking on the Test.