CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
Any time you’re focusing on your BCMSN Test on the method to CCNP certification, you’ll go through at duration regarding how Cisco routers and multilayer switches can get the job done to deliver router redundancy – but there’s A different beneficial services, Server Load Balancing, that does a similar for servers. Although HSRP, VRRP, and CLBP all represent multiple Actual physical routers to hosts as only one virtual router, SLB represents a number of physical servers to hosts as just one Digital server.
In the subsequent case in point, a few Bodily servers are actually positioned into your SRB group ServFarm. They’re represented to your hosts since the virtual server 210.one.one.14.
The hosts will request to talk to the server at 210.1.1.fourteen, not realizing they’re actually communicating Together with the routers in ServFarm. This enables fast cutover if among the list of physical servers goes down, in addition to serves to hide the actual IP addresses of the servers in ServFarm.
The fundamental functions of SLB entails generating the server farm, followed by generating the Digital server. We’ll 먹튀검증 initial increase 210.1.1.11 towards the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# true 210.1.one.eleven
MLS(config-slb-actual)# inservice
The 1st command produces the server farm, with the true command specifying the IP tackle of the true server. The inservice command is necessary by SLB to look at the server as Prepared to take care of the server farm’s workload. The true and inservice instructions really should be repeated for every server inside 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)# Digital 210.one.1.fourteen
MLS(config-slb-vserver)# inservice
Through the best down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP address 210.one.one.14, and connections are authorized once the inservice command is used.
You might also want to regulate which of your community hosts can connect with the Digital server. If hosts or subnets are named With all the consumer command, Those people would be the only consumers that will connect with the virtual server. Observe this command takes advantage of wildcard masks. The following configuration would enable only the hosts over the subnet 210.1.one.0 /24 to connect to the Digital server.
MLS(config-slb-vserver)# client 210.1.1.0 0.0.0.255
SLB will be the server conclusion’s answer to HSRP, VRRP, and GLBP – but you still must comprehend it to become a CCNP! Recognizing redundancy approaches and protocols is significant in nowadays’s networks, so ensure you’re relaxed with SLB just before taking up the exam.