CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
Whenever you’re focusing on your BCMSN Test in your approach to CCNP certification, you’ll study at size about how Cisco routers and multilayer switches can operate to supply router redundancy – but there’s A different handy assistance, Server Load Balancing, that does exactly the same for servers. Whilst HSRP, VRRP, and 토토사이트 CLBP all symbolize a number of physical routers to hosts as just one Digital router, SLB represents multiple physical servers to hosts as an individual virtual server.
In the following illustration, three physical servers have been put into the SRB team ServFarm. They’re represented towards the hosts given that the virtual server 210.one.one.fourteen.
The hosts will seek out to communicate with the server at 210.1.1.fourteen, not understanding they’re in fact communicating with the routers in ServFarm. This enables fast cutover if one of the physical servers goes down, in addition to serves to hide the actual IP addresses on the servers in ServFarm.
The fundamental operations of SLB entails generating the server farm, followed by building the virtual server. We’ll very first insert 210.one.1.11 into the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.one.1.eleven
MLS(config-slb-actual)# inservice
The first command creates the server farm, with the real command specifying the IP address of the true server. The inservice command is needed by SLB to take into account the server as ready to deal with the server farm’s workload. The actual and inservice instructions really should be recurring for each server from the server farm.
To build the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.one.one.fourteen
MLS(config-slb-vserver)# inservice
In the top rated down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP tackle 210.1.one.14, and connections are allowed when the inservice command is used.
You might also want to regulate which of your network hosts can connect to the virtual server. If hosts or subnets are named Together with the customer command, those will be the only consumers that will hook up with the virtual server. Note that this command works by using wildcard masks. The following configuration would allow for just the hosts about the subnet 210.1.one.0 /24 to hook up with the virtual server.
MLS(config-slb-vserver)# shopper 210.one.one.0 0.0.0.255
SLB may be the server conclusion’s respond to to HSRP, VRRP, and GLBP – but you still must comprehend it to become a CCNP! Understanding redundancy strategies and protocols is important in right now’s networks, so make sure you’re comfy with SLB before taking up the Examination.