CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
After you’re working on your BCMSN Examination on your strategy to CCNP certification, you’ll examine at length regarding how Cisco routers and multilayer switches can do the job to provide router redundancy – but there’s One more handy services, Server Load Balancing, that does exactly the same for servers. Though HSRP, VRRP, and CLBP all signify many Actual physical routers to hosts as only one Digital router, SLB represents multiple Bodily servers to hosts as only one Digital server.
In the next case in point, three Bodily servers are already put in the SRB group ServFarm. They’re represented to your hosts as being the virtual server 210.1.one.fourteen.
The hosts will look for to communicate with the server at 210.one.one.fourteen, not knowing which they’re basically communicating Using the routers in ServFarm. This enables brief cutover if one of many Bodily servers goes down, and also serves to hide the 먹튀검증 particular IP addresses of your servers in ServFarm.
The essential operations of SLB involves developing the server farm, followed by creating the virtual server. We’ll very first increase 210.1.one.eleven to your server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# genuine 210.one.one.eleven
MLS(config-slb-true)# inservice
The initial command produces the server farm, with the true command specifying the IP handle of the actual server. The inservice command is needed by SLB to look at the server as Completely ready to take care of the server farm’s workload. The true and inservice commands ought to be repeated for each server from the server farm.
To produce the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.one.one.14
MLS(config-slb-vserver)# inservice
Within the leading down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The virtual server is assigned the IP tackle 210.1.one.fourteen, and connections are permitted once the inservice command is utilized.
You may additionally want to regulate which within your community hosts can connect to the Digital server. If hosts or subnets are named With all the consumer command, those will be the only clients which will hook up with the Digital server. Note that this command works by using wildcard masks. The next configuration would allow for only the hosts on the subnet 210.1.1.0 /24 to connect with the virtual server.
MLS(config-slb-vserver)# shopper 210.one.1.0 0.0.0.255
SLB will be the server close’s solution to HSRP, VRRP, and GLBP – but you continue to ought to comprehend it to become a CCNP! Being aware of redundancy techniques and protocols is vital in today’s networks, so ensure you’re comfy with SLB just before taking up the Test.