CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
After you’re focusing on your BCMSN exam on your own method to CCNP certification, you’ll read at length about how Cisco routers and multilayer switches can get the job done to deliver router redundancy – but there’s One more useful assistance, Server Load Balancing, that does the same for servers. Even though HSRP, VRRP, and CLBP all signify many Actual physical routers to hosts as a single virtual router, SLB signifies a number of physical servers to hosts as just one Digital server.
In the next case in point, 3 physical servers have been positioned into your SRB group ServFarm. They’re represented to your hosts given that the Digital server 210.one.one.14.
The hosts will look for to communicate with the server at 210.one.1.fourteen, not realizing which they’re truly communicating Together with the routers in ServFarm. This permits rapid cutover if one of several Actual physical servers goes down, as well as serves to cover the actual IP addresses on the servers in ServFarm.
The essential functions of SLB consists of making the server farm, accompanied by making the Digital server. We’ll first insert 210.1.1.11 to the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.one.eleven
MLS(config-slb-real)# inservice
The 1st command produces the server farm, with the true command specifying the IP handle of the real server. The inservice command is required by SLB to evaluate the server as Completely ready to deal with the server farm’s workload. The actual and inservice commands should be recurring for each server while in the server farm.
To create the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# 토토사이트 Digital 210.1.1.14
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 deal with 210.1.one.14, and connections are permitted after the inservice command is applied.
You may additionally want to control which of your respective network hosts can hook up with the virtual server. If hosts or subnets are named Together with the customer command, These would be the only purchasers that can connect to the Digital server. Be aware this command employs wildcard masks. The following configuration would make it possible for only the hosts on the subnet 210.one.one.0 /24 to connect to the Digital server.
MLS(config-slb-vserver)# client 210.1.one.0 0.0.0.255
SLB could be the server close’s reply to HSRP, VRRP, and GLBP – but you still have to know it to become a CCNP! Figuring out redundancy approaches and protocols is important in today’s networks, so ensure that you’re cozy with SLB in advance of taking over the Test.