CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
Whenever you’re focusing on your BCMSN Examination on your method to CCNP certification, you’ll read through at length regarding how Cisco routers and multilayer switches can operate to provide router redundancy – but there’s One more practical support, Server Load Balancing, that does precisely the same for servers. Whilst HSRP, VRRP, and CLBP all represent a number of Actual physical routers to hosts as just one virtual router, SLB represents many Actual physical servers to hosts as an individual Digital server.
In the next example, 3 Bodily servers happen to be put to the SRB team ServFarm. They’re represented to your hosts because the virtual server 210.1.one.fourteen.
The hosts will search for to talk to the server at 210.1.1.fourteen, not realizing which they’re in fact communicating Together with the routers in ServFarm. This enables speedy cutover if on the list of Bodily servers goes down, and likewise serves to hide the actual IP addresses with the servers in ServFarm.
The essential operations of SLB consists of generating the server farm, accompanied by making the virtual server. We’ll very first add 210.1.one.11 towards the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# serious 210.one.one.11
MLS(config-slb-true)# inservice
The first command generates the server farm, with the real command specifying the IP address 토토사이트 of the actual server. The inservice command is necessary by SLB to evaluate the server as Completely ready to take care of the server farm’s workload. The true and inservice instructions really should 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)# virtual 210.1.1.fourteen
MLS(config-slb-vserver)# inservice
From the major down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP tackle 210.one.one.14, and connections are permitted as soon as the inservice command is applied.
You may also want to control which of your community hosts can connect with the Digital server. If hosts or subnets are named Along with the shopper command, People will be the only clientele which can connect with the virtual server. Be aware that this command employs wildcard masks. The subsequent configuration would make it possible for just the hosts to the subnet 210.1.one.0 /24 to connect to the Digital server.
MLS(config-slb-vserver)# customer 210.one.1.0 0.0.0.255
SLB is definitely the server finish’s response to HSRP, VRRP, and GLBP – but you still ought to understand it to be a CCNP! Recognizing redundancy methods and protocols is significant in currently’s networks, so be sure you’re cozy with SLB prior to taking over the Examination.