CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
Once you’re engaged on your BCMSN exam with your method to CCNP certification, you’ll go through at length about how Cisco routers and multilayer switches can do the job to provide router redundancy – but there’s A further beneficial service, Server Load Balancing, that does the identical for servers. Whilst HSRP, VRRP, and CLBP all stand for several Actual physical routers to hosts as just one virtual router, SLB represents many Bodily servers to hosts as only one Digital server.
In the following instance, 3 Bodily servers are positioned to the SRB team ServFarm. They’re represented into the hosts as being the Digital server 210.one.1.14.
The hosts will seek to communicate with the server at 210.1.one.fourteen, not realizing that they’re actually speaking Along with the routers in ServFarm. This allows fast cutover if one of many Bodily servers goes down, and in addition serves to hide the particular IP addresses on the servers in ServFarm.
The basic operations of SLB involves building the server farm, accompanied by building the virtual server. We’ll 1st incorporate 210.one.1.eleven for the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.1.1.11
MLS(config-slb-real)# inservice
The first command makes the server farm, with the true command specifying the IP deal with of the real server. The inservice command is required by SLB to look at the server as All set to manage the server farm’s workload. The true and inservice commands need to be repeated for every server during the server farm.
To produce the virtual 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
In 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.one.one.14, and connections are authorized once the inservice command is used.
You may also want to regulate which of your community hosts can hook up with the Digital server. If hosts or subnets 먹튀검증 are named Along with the client command, These would be the only customers which can connect with the Digital server. Take note this command works by using wildcard masks. The following configuration would allow for just the hosts on the subnet 210.1.one.0 /24 to hook up with the virtual server.
MLS(config-slb-vserver)# consumer 210.one.one.0 0.0.0.255
SLB is the server conclusion’s reply to HSRP, VRRP, and GLBP – but you continue to have to realize it to be a CCNP! Being aware of redundancy techniques and protocols is vital in right now’s networks, so be sure to’re relaxed with SLB just before taking over the Examination.