CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
When you’re focusing on your BCMSN exam on your solution to CCNP certification, you’ll go through at length regarding how Cisco routers and multilayer switches can operate to deliver router redundancy – but there’s Yet another helpful provider, Server Load Balancing, that does the same for servers. Whilst HSRP, VRRP, and CLBP all characterize multiple Bodily routers to hosts as only one virtual router, SLB represents a number of Actual physical servers to hosts as a single Digital server.
In the following illustration, 3 Bodily servers are already put into your SRB group ServFarm. They’re represented into the hosts since the virtual server 210.1.one.fourteen.
The hosts will look for to talk to the server at 210.one.one.14, not knowing they’re basically communicating While using the routers in ServFarm. This permits speedy cutover if on the list of Bodily servers goes down, and also serves to hide the actual IP addresses on the servers in ServFarm.
The basic operations of SLB will involve developing the server farm, accompanied by producing the Digital server. We’ll first incorporate 210.one.one.eleven into the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.one.eleven
MLS(config-slb-genuine)# inservice
The 1st command results in the server farm, with the true command specifying the IP handle of the real server. The inservice command is required by SLB to consider the server as All set to manage the server farm’s workload. The actual and inservice commands must be repeated for every server during the server farm.
To generate 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
From your major down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP tackle 210.1.one.fourteen, and connections are permitted after the inservice command is applied.
You may additionally want to manage which of the community hosts can connect 먹튀검증 to the virtual server. If hosts or subnets are named with the shopper command, All those would be the only consumers that may connect to the Digital server. Notice that this command employs wildcard masks. The following configuration would permit only the hosts around the subnet 210.1.one.0 /24 to connect with the Digital server.
MLS(config-slb-vserver)# consumer 210.1.one.0 0.0.0.255
SLB is definitely the server finish’s response to HSRP, VRRP, and GLBP – but you still must know it to be a CCNP! Realizing redundancy strategies and protocols is vital in nowadays’s networks, so you should definitely’re comfortable with SLB in advance of taking over the Examination.