CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
When you’re engaged on your BCMSN exam in your method to CCNP certification, you’ll read at duration about how Cisco routers and multilayer switches can get the job done to deliver router redundancy – but there’s One more valuable assistance, Server Load Balancing, that does the exact same for servers. Even though HSRP, VRRP, and CLBP all depict a number of Actual physical routers to hosts as a single virtual router, SLB represents multiple Bodily servers to hosts as one virtual server.
In the next example, 3 physical servers are placed in to the SRB team ServFarm. They’re represented for the hosts as being the Digital server 210.one.one.fourteen.
The hosts will look for to talk to the server at 210.1.1.fourteen, not recognizing which they’re in fact communicating Using the routers in ServFarm. This enables brief cutover if one of many Actual physical servers goes down, as well as serves to hide the particular IP addresses on the servers in ServFarm.
The fundamental operations of SLB consists of creating the server farm, followed by creating the Digital server. We’ll initially include 210.one.1.11 into the server farm:
MLS(config)# ip slb serverfarm 먹튀검증 ServFarm
MLS(config-slb-sfarm)# real 210.1.1.eleven
MLS(config-slb-actual)# inservice
The main command makes the server farm, with the true command specifying the IP tackle of the real server. The inservice command is necessary by SLB to evaluate the server as Prepared to manage the server farm’s workload. The actual and inservice instructions needs to be repeated for each server from the server farm.
To create the virtual 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 leading down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP handle 210.1.1.14, and connections are permitted as soon as the inservice command is applied.
You may also want to manage which of the community hosts can connect to the Digital server. If hosts or subnets are named While using the client command, These would be the only clientele that can connect to the Digital server. Notice that this command utilizes wildcard masks. The subsequent configuration would allow for just the hosts within the subnet 210.one.one.0 /24 to connect with the Digital server.
MLS(config-slb-vserver)# consumer 210.one.1.0 0.0.0.255
SLB may be the server conclusion’s respond to to HSRP, VRRP, and GLBP – but you still need to realize it to become a CCNP! Being aware of redundancy approaches and protocols is significant in today’s networks, so be sure to’re cozy with SLB ahead of taking over the exam.