CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
When you’re engaged on your BCMSN Test on your own solution to CCNP certification, you’ll read through at length about how Cisco routers and multilayer switches can do the job to deliver router redundancy – but there’s Yet another handy provider, Server Load Balancing, that does precisely the same for servers. Though HSRP, VRRP, and CLBP all symbolize many Actual physical routers to hosts as a single Digital router, SLB represents many Actual physical servers to hosts as one virtual server.
In the following instance, 3 Actual physical servers have already been placed in the SRB group ServFarm. They’re represented towards the hosts because the virtual server 210.1.one.fourteen.
The hosts will find to talk to the server at 210.1.one.fourteen, not realizing they’re basically communicating Using the routers in ServFarm. This enables speedy cutover if on the list of Actual physical servers goes down, in addition to serves to cover the actual IP addresses of the servers in ServFarm.
The basic operations of SLB consists of creating the server farm, accompanied by developing the Digital server. We’ll initially insert 210.one.1.11 to your server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.1.eleven
MLS(config-slb-real)# inservice
The 1st command results in the server farm, with the actual command specifying the IP deal with of the true server. The inservice command is needed by SLB to take into account the server as Prepared to handle the server farm’s workload. The actual and inservice commands really should be repeated for each server during the server farm.
To make the virtual 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
Through the best down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP handle 210.1.one.fourteen, and connections are 먹튀검증 allowed when the inservice command is utilized.
You might also want to manage which within your community hosts can connect to the Digital server. If hosts or subnets are named While using the consumer command, People will be the only clientele which will connect to the Digital server. Be aware this command utilizes wildcard masks. The next configuration would enable just the hosts around the subnet 210.1.one.0 /24 to connect to the virtual server.
MLS(config-slb-vserver)# customer 210.one.one.0 0.0.0.255
SLB is definitely the server conclude’s remedy to HSRP, VRRP, and GLBP – but you still really need to comprehend it to become a CCNP! Realizing redundancy techniques and protocols is vital in today’s networks, so be sure you’re comfy with SLB ahead of taking over the Test.