CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
If you’re focusing on your BCMSN Test in your solution to CCNP certification, you’ll study at duration regarding how Cisco routers and multilayer switches can get the job done to supply router redundancy – but there’s An additional handy support, Server Load Balancing, that does a similar for servers. Whilst HSRP, VRRP, and CLBP all symbolize numerous Bodily routers to hosts as one Digital router, SLB signifies various Actual physical servers to hosts as only one virtual server.
In the following case in point, three physical servers are already placed into the SRB group ServFarm. They’re represented into the hosts as being the Digital server 210.one.1.14.
The hosts will seek to talk to the server at 210.1.one.14, not figuring out that they’re in fact speaking With all the routers in ServFarm. This enables quick cutover if one of many physical servers goes down, in addition to serves to hide the particular IP addresses with the servers in ServFarm.
The essential operations of SLB includes generating the server farm, accompanied by producing the virtual server. We’ll first add 210.one.one.11 to your server farm:
MLS(config)# 토토사이트 ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# true 210.1.one.eleven
MLS(config-slb-actual)# inservice
The initial command produces the server farm, with the true command specifying the IP deal with of the real server. The inservice command is necessary by SLB to consider the server as Completely ready to take care of the server farm’s workload. The true and inservice instructions should be repeated for every server during the server farm.
To develop the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# virtual 210.one.one.fourteen
MLS(config-slb-vserver)# inservice
Within the leading down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The Digital server is assigned the IP tackle 210.1.1.fourteen, and connections are authorized once the inservice command is utilized.
You might also want to regulate which within your network hosts can connect to the Digital server. If hosts or subnets are named Along with the shopper command, Individuals would be the only purchasers which can connect to the Digital server. Note that this command makes use of wildcard masks. The subsequent configuration would let just the hosts on the subnet 210.1.one.0 /24 to connect with the virtual server.
MLS(config-slb-vserver)# consumer 210.one.one.0 0.0.0.255
SLB would be the server conclusion’s respond to to HSRP, VRRP, and GLBP – but you continue to have to realize it to be a CCNP! Knowing redundancy approaches and protocols is important in currently’s networks, so ensure you’re cozy with SLB right before taking on the Test.