CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
After you’re working on your BCMSN Test in your technique to CCNP certification, you’ll read at length regarding how Cisco routers and multilayer switches can do the job to deliver router redundancy – but there’s An additional practical service, Server Load Balancing, that does a similar for servers. While HSRP, VRRP, and CLBP all depict many physical routers to hosts as just one virtual router, SLB signifies many physical servers to hosts as only one virtual server.
In the following case in point, three physical servers have already been put into 먹튀검증 your SRB group ServFarm. They’re represented towards the hosts because the virtual server 210.one.1.fourteen.
The hosts will look for to talk to the server at 210.1.1.fourteen, not recognizing they’re essentially speaking with the routers in ServFarm. This enables quick cutover if on the list of Actual physical servers goes down, as well as serves to hide the actual IP addresses of the servers in ServFarm.
The essential functions of SLB requires making the server farm, followed by producing the virtual server. We’ll initially include 210.one.one.eleven to the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# serious 210.1.1.11
MLS(config-slb-real)# inservice
The very first command results in the server farm, with the real command specifying the IP handle of the real server. The inservice command is needed by SLB to evaluate the server as Completely ready to manage the server farm’s workload. The true and inservice commands should be repeated for each server in the server farm.
To develop the Digital 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
Within the prime down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP handle 210.one.1.14, and connections are permitted when the inservice command is utilized.
You may additionally want to control which within your community hosts can hook up with the virtual server. If hosts or subnets are named While using the shopper command, Individuals will be the only purchasers which can hook up with the virtual server. Notice this command makes use of wildcard masks. The following configuration would permit just the hosts on the subnet 210.1.1.0 /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 conclude’s remedy to HSRP, VRRP, and GLBP – but you still should understand it to become a CCNP! Recognizing redundancy strategies and protocols is important in today’s networks, so ensure that you’re relaxed with SLB ahead of taking up the Examination.