CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
When you’re focusing on your BCMSN exam in your technique to CCNP certification, you’ll read at size regarding how Cisco routers and multilayer switches can perform to deliver router redundancy – but there’s another handy service, Server Load Balancing, that does exactly the same for servers. Whilst HSRP, VRRP, and CLBP all characterize numerous physical routers to hosts as one Digital router, SLB signifies several Bodily servers to hosts as an individual Digital server.
In the next example, 3 Actual physical servers have been positioned into your SRB team ServFarm. They’re represented for the hosts as the Digital server 210.1.one.14.
The hosts will look for to communicate with the server at 210.1.1.14, not realizing they’re actually speaking With all the routers in ServFarm. This allows speedy cutover if one of the physical servers goes down, and also serves to hide the particular IP addresses of your servers in ServFarm.
The fundamental operations of SLB requires building 먹튀검증 the server farm, accompanied by building the virtual server. We’ll very first add 210.one.one.11 on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# authentic 210.one.one.11
MLS(config-slb-true)# inservice
The initial command creates the server farm, with the true command specifying the IP address of the real server. The inservice command is needed by SLB to think about the server as ready to manage the server farm’s workload. The real and inservice commands need to be recurring for each server inside the server farm.
To build the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.one.1.14
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.one.fourteen, and connections are permitted once the inservice command is applied.
You might also want to regulate which of your community hosts can connect with the Digital server. If hosts or subnets are named with the client command, All those would be the only customers that can connect to the virtual server. Take note this command works by using wildcard masks. The subsequent configuration would allow only the hosts around the subnet 210.1.1.0 /24 to connect to the Digital server.
MLS(config-slb-vserver)# client 210.one.one.0 0.0.0.255
SLB is the server conclusion’s reply to HSRP, VRRP, and GLBP – but you still need to know it to become a CCNP! Realizing redundancy procedures and protocols is significant in right now’s networks, so make sure you’re comfy with SLB in advance of taking over the Test.