CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
If you’re engaged on your BCMSN Test in your method to CCNP certification, you’ll read at length regarding how Cisco routers and multilayer switches can work to deliver router redundancy – but there’s Yet another 메이저사이트 useful support, Server Load Balancing, that does a similar for servers. Though HSRP, VRRP, and CLBP all characterize a number of physical routers to hosts as only one Digital router, SLB signifies multiple Bodily servers to hosts as one Digital server.
In the next case in point, 3 Bodily servers are placed in to the SRB group ServFarm. They’re represented to the hosts because the Digital server 210.one.1.fourteen.
The hosts will seek to communicate with the server at 210.1.one.fourteen, not realizing which they’re in fact speaking Along with the routers in ServFarm. This enables quick cutover if among the list of Actual physical servers goes down, as well as serves to cover the actual IP addresses in the servers in ServFarm.
The basic operations of SLB includes making the server farm, accompanied by creating the virtual server. We’ll initially add 210.1.1.eleven to the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# authentic 210.one.1.eleven
MLS(config-slb-true)# inservice
The initial command results in the server farm, with the actual command specifying the IP deal with of the real server. The inservice command is required by SLB to evaluate the server as All set to take care of the server farm’s workload. The true and inservice commands must be recurring for each server from the server farm.
To produce 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
From your top down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The virtual server is assigned the IP tackle 210.1.1.fourteen, and connections are authorized when the inservice command is utilized.
You may also want to regulate which of one's community hosts can connect with the Digital server. If hosts or subnets are named Using the customer command, Individuals will be the only customers which will connect with the virtual server. Be aware this command takes advantage of wildcard masks. The next configuration would make it possible for just the hosts over the subnet 210.one.1.0 /24 to connect to the virtual server.
MLS(config-slb-vserver)# client 210.one.1.0 0.0.0.255
SLB could be the server conclusion’s answer to HSRP, VRRP, and GLBP – but you still really need to comprehend it to be a CCNP! Knowing redundancy strategies http://query.nytimes.com/search/sitesearch/?action=click&contentCollection®ion=TopBar&WT.nav=searchWidget&module=SearchSubmit&pgtype=Homepage#/토토사이트 and protocols is significant in now’s networks, so make sure you’re cozy with SLB ahead of taking up the exam.