CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)
Whenever you’re engaged on your BCMSN exam on the strategy to CCNP certification, you’ll study at duration about how Cisco routers and multilayer switches can operate to deliver router redundancy – but there’s One more beneficial assistance, Server Load Balancing, that does a similar for servers. Though HSRP, VRRP, and CLBP all characterize many Actual physical routers to hosts as a single virtual router, SLB represents various Actual physical servers to hosts as just one virtual server.
In the next case in point, a few Actual physical servers happen to be positioned into the SRB 먹튀검증 team ServFarm. They’re represented to the hosts because the virtual server 210.one.1.fourteen.
The hosts will request to talk to the server at 210.1.1.fourteen, not knowing that they’re essentially communicating Together with the routers in ServFarm. This allows fast cutover if one of the physical servers goes down, and also serves to cover the actual IP addresses with the servers in ServFarm.
The essential functions of SLB entails making the server farm, followed by making the virtual server. We’ll very first incorporate 210.one.one.eleven on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# real 210.1.one.11
MLS(config-slb-actual)# inservice
The very first command makes the server farm, with the real command specifying the IP deal with of the real server. The inservice command is necessary by SLB to look at the server as Prepared to take care of the server farm’s workload. The real and inservice commands really should be repeated for each server from the server farm.
To build the Digital 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
Within the top rated down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP address 210.1.1.14, and connections are allowed as soon as the inservice command is applied.
You may additionally want to manage which of the community hosts can connect with the Digital server. If hosts or subnets are named Together with the customer command, People would be the only clientele that can connect to the Digital server. Notice that this command takes advantage of wildcard masks. The subsequent configuration would permit just the hosts around the subnet 210.one.1.0 /24 to connect to the virtual server.
MLS(config-slb-vserver)# shopper 210.one.1.0 0.0.0.255
SLB would be the server stop’s answer to HSRP, VRRP, and GLBP – but you continue to must know it to be a CCNP! Figuring out redundancy procedures and protocols is vital in today’s networks, so be sure you’re comfy with SLB prior to taking on the exam.