CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)

Computer and Technology - Whenever you are focusing on your BCMSN exam on your path to CCNP certification, you will read at length about how Cisco routers and multilayer switches can function to supply router redundancy - but there is another helpful service, Server Load Balancing, that does a similar for servers. While HSRP, VRRP, and CLBP all represent multiple physical routers to hosts as one virtual router, SLB represents multiple physical servers to hosts as one virtual server. 

CCNP Certification / BCMSN Exam Tutorial:  Server Load Balancing (SLB)

CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)

Inside the following example, three physical servers happen to be placed straight into the SRB group ServFarm. They are represented towards the hosts like the virtual server 210. 1. 1. 14. 

 The hosts will seek to contact the server at 210. 1. 1. 14, not truly understanding that they are communicating using the routers in ServFarm. This enables quick cut over if perhaps one of the physical servers goes down, and likewise serves to cover the particular IP addresses from the servers in ServFarm. 

 The fundamental operations of SLB involve creating the server farm, followed by creating the virtual server. We will first add 210. 1. 1. 11 towards the server farm : 

 MLS (config ) # ip slab server farm ServFarm 

 MLS (config-slb-sfarm ) # real 210. 1. 1. 11 

 MLS (config-slb-real ) # inservice 

 The very first command creates the server farm, using the real command specifying the IP address from the real server. The in-service command is required by SLB to think about the server as able to handle the server farm's workload. The actual and in-service commands ought to be repeated for every server inside the server farm. 

 To make the virtual server : 

 MLS (config ) # ip slab server VIRTUAL_SERVER 

 MLS (config-slb-vserver ) # serverfarm ServFarm 

 MLS (config-slb-vserver ) # virtual 210. 1. 1. 14 

 MLS (config-slb-vserver ) # inservice 

 From the highest down, the server was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP address 210. 1. 1. 14, and connections are allowed when the in-service command is applied. 

 You may even wish to control which of your respective network hosts can connect towards the virtual server. If hosts or subnets are named using the client command, those will certainly be the only real clients which will connect towards the virtual server. Note that it command uses wildcard masks. The listed configuration would allow just the hosts upon the subnet 210. 1. 1. 0 / 24 to link towards the virtual server. 

 MLS (config-slb-vserver ) # client 210. 1. 1. 0 0. 0. 0. 255 

 SLB is that the server end's response to HSRP, VRRP, and GLBP - but you continue to have to know it to turn into a CCNP! Knowing redundancy strategies and protocols is vital in today's networks, so ensure you are comfortable with SLB before taking the exam.

 I think it's enough all about CCNP Certification / BCMSN Exam Tutorial:  Server Load Balancing (SLB). Thanks so much :)

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