CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
Whenever you’re working on your BCMSN Examination in your solution to CCNP certification, you’ll read through at duration regarding how Cisco routers and multilayer switches can work to provide router redundancy – but there’s A different handy assistance, Server Load Balancing, that does the identical for servers. Though HSRP, VRRP, and CLBP all depict many Bodily routers to hosts as just one Digital router, SLB represents several Actual physical servers to hosts as an individual Digital server.
In the next example, three Bodily servers have already been placed in to the SRB team ServFarm. They’re represented into the hosts given that the virtual server 210.one.one.fourteen.
The hosts will search for to communicate with the server at 210.one.1.fourteen, not realizing they’re basically communicating With all the routers in ServFarm. This allows fast cutover if one of many Actual physical servers goes down, as well as serves to hide the particular IP addresses in the servers in ServFarm.
The essential operations of SLB includes generating the server farm, accompanied by generating the Digital server. We’ll to start with incorporate 210.1.one.11 on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# serious 210.1.one.11
MLS(config-slb-actual)# inservice
The very first command makes the server farm, with the actual command specifying the IP address of the real server. The inservice command is needed by SLB to look at the server as All set to handle the server farm’s workload. The real and inservice instructions needs to be repeated for every server during 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)# virtual 210.1.1.fourteen
MLS(config-slb-vserver)# inservice
From your major down, the vserver was named VIRTUAL_SERVER, which represents the server farm 먹튀검증 ServFarm. The Digital server is assigned the IP deal with 210.1.one.fourteen, and connections are permitted once the inservice command is used.
You might also want to manage which of your network hosts can connect with the Digital server. If hosts or subnets are named Using the client command, Those people will be the only clientele that could hook up with the virtual server. Note that this command employs wildcard masks. The subsequent configuration would allow only the hosts around the subnet 210.1.one.0 /24 to hook up with the virtual server.
MLS(config-slb-vserver)# shopper 210.1.one.0 0.0.0.255
SLB will be the server conclusion’s remedy to HSRP, VRRP, and GLBP – but you continue to need to know it to be a CCNP! Understanding redundancy approaches and protocols is significant in these days’s networks, so you should definitely’re snug with SLB before taking on the Examination.