CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Once you’re focusing on your BCMSN Test in your method to CCNP certification, you’ll read at size regarding how Cisco routers and multilayer switches can operate to deliver router redundancy – but there’s A different handy services, Server Load Balancing, that does the exact same for servers. Even though HSRP, VRRP, and CLBP all stand for several physical routers to hosts as just one Digital router, SLB signifies numerous physical servers to hosts as one virtual server.
In the subsequent illustration, a few Actual physical servers have already been placed into the SRB group ServFarm. They’re represented on the hosts because the virtual server 210.1.one.fourteen.
The hosts will seek out to communicate with the server at 210.1.one.fourteen, not recognizing they’re really speaking with the routers in ServFarm. This allows quick cutover if among the Bodily servers goes down, and likewise serves to hide the actual IP addresses in the servers in ServFarm.
The basic functions of SLB entails producing the server farm, accompanied by making the virtual server. We’ll initially insert 210.1.one.eleven to the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# authentic 210.one.one.eleven
MLS(config-slb-genuine)# inservice
The first command generates the server farm, with the true command specifying the IP handle of the actual server. The inservice command is needed by SLB to look at the server as Completely ready to manage the server farm’s workload. The true and inservice instructions must be recurring for each server in the server farm.
To create the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.1.one.fourteen
MLS(config-slb-vserver)# inservice
In the top rated down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The virtual server is assigned the IP address 210.one.1.fourteen, and connections are permitted after the inservice command is utilized.
You may additionally want to regulate which of your community 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 consumers 먹튀검증 that could connect to the virtual server. Take note that this command employs wildcard masks. The following configuration would let just the hosts within the subnet 210.one.1.0 /24 to hook up with the Digital server.
MLS(config-slb-vserver)# customer 210.one.one.0 0.0.0.255
SLB is the server stop’s respond to to HSRP, VRRP, and GLBP – but you still need to know it to be a CCNP! Knowing redundancy methods and protocols is vital in today’s networks, so ensure that you’re comfortable with SLB ahead of taking on the exam.
