CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Whenever you’re focusing on your BCMSN Examination with your technique to CCNP certification, you’ll examine at size about how Cisco routers and multilayer switches can function to deliver router redundancy – but there’s A different valuable support, Server Load Balancing, that does the same for servers. When HSRP, VRRP, and CLBP all represent several Bodily routers to hosts as only one Digital router, SLB represents many physical servers to hosts as one Digital server.
In the next case in point, 3 Bodily servers happen to be put in the SRB team ServFarm. They’re represented to your hosts as being the Digital server 210.one.one.14.
The hosts will seek to talk to the server at 210.one.one.fourteen, not figuring out they’re essentially communicating Using the routers in ServFarm. This allows speedy cutover if one of many Actual physical servers goes down, in addition to serves to hide the actual IP addresses in the servers in ServFarm.
The fundamental functions of SLB requires building the server farm, accompanied by building the virtual server. We’ll to start with add 210.one.one.11 to your server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.1.eleven
MLS(config-slb-real)# inservice
The initial command creates the server farm, with the real command specifying the IP handle of the real server. The inservice command is needed by SLB to look 먹튀검증 at the server as ready to deal with the server farm’s workload. The true and inservice commands really should be repeated for each server within the server farm.
To produce the Digital server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.one.1.fourteen
MLS(config-slb-vserver)# inservice
Within the prime down, the vserver was named VIRTUAL_SERVER, which signifies the server farm ServFarm. The Digital server is assigned the IP tackle 210.1.one.fourteen, and connections are authorized once the inservice command is applied.
You may also want to manage which within your network hosts can connect with the Digital server. If hosts or subnets are named Along with the shopper command, Individuals would be the only purchasers that will connect with the virtual server. Observe that this command uses wildcard masks. The following configuration would let just the hosts about the subnet 210.one.1.0 /24 to connect with the Digital server.
MLS(config-slb-vserver)# client 210.1.one.0 0.0.0.255
SLB would be the server conclusion’s remedy to HSRP, VRRP, and GLBP – but you continue to have to realize it to be a CCNP! Understanding redundancy techniques and protocols is significant in today’s networks, so be sure you’re comfortable with SLB in advance of taking over the exam.