CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
After you’re working on your BCMSN Examination on your strategy to CCNP certification, you’ll read through at duration about how Cisco routers and multilayer switches can work to supply router redundancy – but there’s another helpful support, Server Load Balancing, that does the identical for servers. Though HSRP, VRRP, and CLBP all depict many Actual physical routers to hosts as one Digital router, SLB signifies multiple Actual physical servers to hosts as an individual virtual server.
In the subsequent instance, 3 Bodily servers have been put into your SRB group ServFarm. They’re represented to the hosts because the Digital server 210.1.1.14.
The hosts will request to talk to the server at 210.1.one.14, not realizing which they’re really communicating with the routers in ServFarm. This allows quick cutover if one of many physical servers goes down, as well as serves to cover the particular IP addresses from the servers in ServFarm.
The essential functions of SLB will involve making the server farm, followed by generating the Digital server. We’ll very first add 210.1.1.11 into the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# real 210.1.one.eleven
MLS(config-slb-serious)# inservice
The primary command produces the server farm, with the true command specifying the IP address of the actual server. The inservice command is needed by SLB to think about the server as Prepared to deal with the server farm’s workload. The actual and inservice commands need to be recurring for every server inside the server farm.
To build 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
Through the top rated down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The virtual server is assigned the IP tackle 210.one.1.14, and connections are allowed as soon as the inservice command is utilized.
You may also want to regulate which within your community hosts can connect with the Digital server. If hosts or subnets are named with the consumer command, All those would be the 먹튀검증 only customers that can connect to the virtual server. Be aware this command employs wildcard masks. The following configuration would enable just the hosts about the subnet 210.1.one.0 /24 to connect to the Digital server.
MLS(config-slb-vserver)# customer 210.one.1.0 0.0.0.255
SLB would be the server stop’s answer to HSRP, VRRP, and GLBP – but you still need to comprehend it to be a CCNP! Realizing redundancy tactics and protocols is significant in today’s networks, so you should definitely’re relaxed with SLB right before taking over the Examination.