CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Whenever you’re engaged on your BCMSN Examination on your own solution to CCNP certification, you’ll read at size about how Cisco routers and multilayer switches can get the job done to deliver router redundancy – but there’s An additional valuable service, Server Load Balancing, that does the identical for servers. Whilst HSRP, VRRP, and CLBP all stand for many Bodily routers to hosts as one virtual router, SLB represents a number of Bodily servers to hosts as an individual Digital server.
In the following example, a few physical servers happen to be put in the SRB 먹튀검증 group ServFarm. They’re represented towards the hosts as being the virtual server 210.one.1.fourteen.
The hosts will look for to communicate with the server at 210.1.one.fourteen, not being aware of that they’re truly speaking with the routers in ServFarm. This enables fast cutover if one of the physical servers goes down, and likewise serves to cover the particular IP addresses from the servers in ServFarm.
The essential operations of SLB consists of developing the server farm, accompanied by developing the Digital server. We’ll to start with insert 210.1.one.eleven to the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# genuine 210.1.one.eleven
MLS(config-slb-authentic)# inservice
The main command creates the server farm, with the true command specifying the IP address of the real server. The inservice command is necessary by SLB to take into account the server as All set to manage the server farm’s workload. The actual and inservice instructions must be recurring for each server in the server farm.
To develop the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.one.1.fourteen
MLS(config-slb-vserver)# inservice
From your top down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The Digital server is assigned the IP address 210.one.1.14, and connections are permitted as soon as the inservice command is applied.
You might also want to manage which within your community hosts can hook up with the Digital server. If hosts or subnets are named Along with the shopper command, These will be the only customers that could connect to the Digital server. Be aware that this command employs wildcard masks. The following configuration would let just the hosts on the subnet 210.1.1.0 /24 to connect with the virtual server.
MLS(config-slb-vserver)# customer 210.1.1.0 0.0.0.255
SLB will be the server stop’s response to HSRP, VRRP, and GLBP – but you still really need to comprehend it to become a CCNP! Figuring out redundancy approaches and protocols is important in these days’s networks, so you should definitely’re relaxed with SLB right before taking on the exam.