CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
When you’re working on your BCMSN exam on your own solution to CCNP certification, you’ll examine at size about how Cisco routers and multilayer switches can function to offer router redundancy – but there’s An additional handy assistance, Server Load Balancing, that does the identical for servers. Even though HSRP, VRRP, and CLBP all depict various Bodily routers to hosts as a single virtual router, SLB represents numerous Bodily servers to hosts as only one virtual server.
In the next example, a few Bodily servers are already positioned in the SRB group ServFarm. They’re represented for the hosts as being the virtual server 210.one.one.14.
The hosts will seek out to talk to the server at 210.one.1.fourteen, not understanding which they’re essentially communicating With all the routers in ServFarm. This allows rapid cutover if among the Bodily servers goes down, and in addition serves to cover the particular IP addresses on the servers in ServFarm.
The basic operations of SLB requires generating the server farm, accompanied by developing the Digital server. We’ll very 먹튀검증 first incorporate 210.one.1.eleven on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# serious 210.1.1.eleven
MLS(config-slb-actual)# inservice
The initial command creates the server farm, with the actual command specifying the IP tackle of the true server. The inservice command is necessary by SLB to consider the server as Prepared to manage the server farm’s workload. The real and inservice commands should be recurring for each 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.one.14
MLS(config-slb-vserver)# inservice
With the prime down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP address 210.1.one.fourteen, and connections are allowed after the inservice command is used.
You may additionally want to control which of the community hosts can hook up with the Digital server. If hosts or subnets are named While using the customer command, People will be the only customers that will connect to the virtual server. Note this command works by using wildcard masks. The following configuration would let just the hosts within the subnet 210.one.1.0 /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 conclude’s reply to HSRP, VRRP, and GLBP – but you still really need to know it to become a CCNP! Realizing redundancy procedures and protocols is vital in currently’s networks, so ensure that you’re cozy with SLB before taking up the Test.