CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
Once you’re focusing on your BCMSN exam on your own solution to CCNP certification, you’ll browse at length about how Cisco routers and multilayer switches can operate to offer router redundancy – but there’s An additional useful assistance, Server Load Balancing, that does the identical for servers. Whilst HSRP, VRRP, and CLBP all represent multiple Actual physical routers to hosts as an individual Digital router, SLB represents numerous Bodily servers to hosts as one Digital server.
In the subsequent instance, a few Bodily servers happen to be placed in to the SRB team ServFarm. They’re represented on the hosts as the virtual server 210.1.1.14.
The hosts will seek to communicate with the server at 210.one.1.fourteen, not figuring out they’re actually speaking Along with the routers in ServFarm. This enables brief cutover if among the list of physical servers goes down, and likewise serves to hide the actual IP addresses of your servers in ServFarm.
The fundamental operations of SLB involves producing the server farm, followed by developing the 먹튀검증 virtual server. We’ll initial increase 210.one.1.11 into the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# serious 210.one.1.11
MLS(config-slb-true)# inservice
The very first command produces the server farm, with the true command specifying the IP handle of the real server. The inservice command is necessary by SLB to take into account the server as Prepared to handle the server farm’s workload. The true and inservice commands ought to be recurring for each server in the server farm.
To produce the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.1.one.14
MLS(config-slb-vserver)# inservice
From the prime down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The Digital server is assigned the IP handle 210.one.one.fourteen, and connections are permitted after the inservice command is utilized.
You may additionally want to control which of your community hosts can connect to the Digital server. If hosts or subnets are named While using the consumer command, those would be the only consumers that can hook up with the Digital server. Take note this command uses wildcard masks. The next configuration would permit only the hosts on the subnet 210.one.one.0 /24 to connect to the Digital server.
MLS(config-slb-vserver)# client 210.1.1.0 0.0.0.255
SLB could be the server conclusion’s response to HSRP, VRRP, and GLBP – but you continue to need to know it to become a CCNP! Being aware of redundancy strategies and protocols is vital in these days’s networks, so make sure you’re cozy with SLB right before taking up the exam.