CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
If you’re engaged on your BCMSN Examination with your way to CCNP certification, you’ll study at length about how Cisco routers and multilayer switches can operate to offer router redundancy – but there’s An additional beneficial service, Server Load Balancing, that does the identical for servers. Even though HSRP, VRRP, and CLBP all signify many physical routers to hosts as just one Digital router, SLB signifies multiple physical servers to hosts as a single virtual server.
In the subsequent illustration, three physical servers have been placed in to the SRB group ServFarm. They’re represented to the hosts as the virtual server 210.1.one.14.
The hosts will request to talk to the server at 210.one.1.14, not understanding they’re truly speaking with the routers in ServFarm. This enables brief cutover if one of several Actual physical servers goes down, and in addition serves to cover the particular IP addresses of your servers in ServFarm.
The basic operations of SLB entails developing the server farm, followed by making the Digital server. We’ll initial 사설사이트 add 210.1.1.11 for the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# serious 210.one.one.11
MLS(config-slb-serious)# inservice
The very first command generates the server farm, with the actual 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 deal with the server farm’s workload. The real and inservice instructions ought to be recurring for each server while in 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 210.1.1.fourteen
MLS(config-slb-vserver)# inservice
From your major down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. http://query.nytimes.com/search/sitesearch/?action=click&contentCollection®ion=TopBar&WT.nav=searchWidget&module=SearchSubmit&pgtype=Homepage#/토토사이트 The virtual server is assigned the IP deal with 210.1.one.fourteen, and connections are authorized once the inservice command is used.
You might also want to regulate which of your respective community hosts can connect to the Digital server. If hosts or subnets are named Together with the customer command, those will be the only purchasers that will connect with the Digital server. Notice this command works by using wildcard masks. The next configuration would make it possible for only the hosts within the subnet 210.1.1.0 /24 to hook up with the Digital server.
MLS(config-slb-vserver)# client 210.one.1.0 0.0.0.255
SLB will be the server end’s solution to HSRP, VRRP, and GLBP – but you continue to really need to understand it to be a CCNP! Understanding redundancy approaches and protocols is important in today’s networks, so be sure to’re comfortable with SLB just before taking on the Examination.