CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Once you’re engaged on your BCMSN Test on your own method to CCNP certification, you’ll examine at length about how Cisco routers and multilayer switches can operate to provide router redundancy – but there’s One more beneficial provider, Server Load Balancing, that does the same for servers. Though HSRP, VRRP, and CLBP all characterize various Actual physical routers to hosts as an individual virtual router, SLB represents several Actual physical servers to hosts as an individual Digital server.
In the subsequent case in point, a few Bodily servers have been positioned in to the SRB team ServFarm. They’re represented into the hosts because the Digital server 210.one.one.14.
The hosts will look for to talk to the server at 210.1.1.14, not understanding that they’re basically speaking With all the routers in ServFarm. This permits speedy cutover if one of many physical servers goes down, and likewise serves to hide the actual IP addresses with the servers in ServFarm.
The fundamental operations of SLB entails developing the server farm, followed by generating the virtual server. We’ll initially include 210.one.one.eleven for the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# real 210.1.one.11
MLS(config-slb-true)# inservice
The first command produces the server farm, with the true command specifying the IP deal with of the true server. The inservice command is necessary by SLB to evaluate the server as Prepared to manage the server farm’s workload. The real and inservice commands should be recurring for each server within the server farm.
To build the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.one.1.14
MLS(config-slb-vserver)# inservice
With the prime down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The Digital server is assigned the IP deal 먹튀검증 with 210.1.1.14, and connections are authorized when the inservice command is utilized.
You may additionally want to control which of one's community hosts can connect to the Digital server. If hosts or subnets are named Together with the consumer command, All those will be the only purchasers that can hook up with the virtual server. Take note that this command employs wildcard masks. The next configuration would make it possible for only the hosts over the subnet 210.one.1.0 /24 to connect with the Digital server.
MLS(config-slb-vserver)# shopper 210.one.1.0 0.0.0.255
SLB would be the server conclusion’s solution to HSRP, VRRP, and GLBP – but you still ought to realize it to become a CCNP! Being aware of redundancy strategies and protocols is important in nowadays’s networks, so ensure you’re comfy with SLB just before taking up the exam.