CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
Whenever you’re focusing on your BCMSN Examination in your technique to CCNP certification, you’ll examine at length about how Cisco routers and multilayer switches can function to supply router redundancy – but there’s Yet another valuable services, Server Load Balancing, that does precisely the same for servers. Although HSRP, VRRP, and CLBP all stand for multiple Bodily routers to hosts as one Digital router, SLB signifies a number of Actual physical servers 먹튀검증 to hosts as just one Digital server.
In the next case in point, a few physical servers have already been placed to the SRB team ServFarm. They’re represented towards the hosts because the Digital server 210.one.one.14.
The hosts will search for to talk to the server at 210.1.1.14, not realizing that they’re basically communicating While using the routers in ServFarm. This permits quick cutover if one of the Bodily servers goes down, and in addition serves to hide the particular IP addresses of your servers in ServFarm.
The basic functions of SLB involves building the server farm, followed by creating the Digital server. We’ll first increase 210.one.one.11 for the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# real 210.one.1.eleven
MLS(config-slb-real)# inservice
The very first command generates the server farm, with the real command specifying the IP handle of the true server. The inservice command is necessary by SLB to take into account the server as ready to handle the server farm’s workload. The true and inservice commands need to be repeated for each server while in the server farm.
To create the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.1.one.14
MLS(config-slb-vserver)# inservice
From your leading down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP address 210.one.1.14, and connections are authorized after the inservice command is applied.
You may additionally want to regulate which within your network hosts can connect with the virtual server. If hosts or subnets are named Using the consumer command, People will be the only shoppers that may connect to the Digital server. Notice this command works by using wildcard masks. The next configuration would enable just the hosts to the subnet 210.1.one.0 /24 to hook up with the virtual server.
MLS(config-slb-vserver)# client 210.1.1.0 0.0.0.255
SLB could be the server stop’s response to HSRP, VRRP, and GLBP – but you still need to know it to become a CCNP! Recognizing redundancy methods and protocols is important in right now’s networks, so be sure you’re cozy with SLB right before taking on the Test.