CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
Once you’re focusing on your BCMSN Examination on your own approach to CCNP certification, you’ll read at length regarding how Cisco routers and multilayer switches can work to provide router redundancy – but there’s Yet another handy support, Server Load Balancing, that does exactly the same for servers. Whilst HSRP, VRRP, and CLBP all symbolize several Actual physical routers to hosts as a single Digital router, SLB signifies numerous Bodily servers to hosts as one virtual server.
In the subsequent 토토사이트 illustration, 3 physical servers have been placed in to the SRB team ServFarm. They’re represented towards the hosts as the Digital server 210.one.1.fourteen.
The hosts will search for to communicate with the server at 210.1.one.14, not understanding they’re basically communicating With all the routers in ServFarm. This permits quick cutover if one of several Actual physical servers goes down, and likewise serves to cover the actual IP addresses of your servers in ServFarm.
The essential operations of SLB includes making the server farm, accompanied by producing the Digital server. We’ll first add 210.1.1.11 for the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# authentic 210.1.1.11
MLS(config-slb-genuine)# inservice
The very first command results in the server farm, with the real command specifying the IP deal with of the actual server. The inservice command is necessary by SLB to take into account the server as ready to deal with the server farm’s workload. The real and inservice instructions must be repeated for each server during the server farm.
To develop the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.1.1.fourteen
MLS(config-slb-vserver)# inservice
From the prime down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP deal with 210.one.1.fourteen, and connections are allowed as soon as the inservice command is applied.
You might also want to regulate which of the network hosts can connect with the virtual server. If hosts or subnets are named With all the shopper command, Those people would be the only clients which will connect with the virtual server. Note this command utilizes wildcard masks. The next configuration would make it possible for only the hosts on the subnet 210.one.one.0 /24 to connect to the virtual server.
MLS(config-slb-vserver)# client 210.1.one.0 0.0.0.255
SLB is the server stop’s solution to HSRP, VRRP, and GLBP – but you still must realize it to become a CCNP! Being aware of redundancy procedures and protocols is important in these days’s networks, so ensure that you’re cozy with SLB prior to taking up the exam.