CCNP Certification / BCMSN Test Tutorial: Server Load Balancing (SLB)
Any time you’re working on your BCMSN Examination in your approach to CCNP certification, you’ll go 먹튀검증 through at length regarding how Cisco routers and multilayer switches can operate to supply router redundancy – but there’s An additional handy service, Server Load Balancing, that does the identical for servers. Even though HSRP, VRRP, and CLBP all signify many Actual physical routers to hosts as an individual virtual router, SLB signifies a number of Actual physical servers to hosts as a single virtual server.
In the following instance, 3 Actual physical servers have already been positioned to the SRB team ServFarm. They’re represented to your hosts given that the virtual server 210.one.one.14.
The hosts will seek out to talk to the server at 210.one.one.14, not recognizing which they’re actually communicating Together with the routers in ServFarm. This enables brief cutover if one of several physical servers goes down, and in addition serves to hide the actual IP addresses in the servers in ServFarm.
The fundamental operations of SLB involves creating the server farm, accompanied by creating the virtual server. We’ll initially increase 210.one.1.11 on the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# actual 210.one.1.eleven
MLS(config-slb-actual)# inservice
The 1st command results in the server farm, with the true command specifying the IP address of the real server. The inservice command is required by SLB to consider the server as ready to deal with the server farm’s workload. The true and inservice commands needs to be repeated for each server from the server farm.
To generate the virtual server:
MLS(config)# ip slb vserver VIRTUAL_SERVER
MLS(config-slb-vserver)# serverfarm ServFarm
MLS(config-slb-vserver)# Digital 210.1.1.14
MLS(config-slb-vserver)# inservice
With the major down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP address 210.one.one.14, and connections are allowed once the inservice command is applied.
You may also want to control which of the community hosts can hook up with the virtual server. If hosts or subnets are named with the shopper command, those would be the only purchasers that could hook up with the virtual server. Be aware this command works by using wildcard masks. The subsequent configuration would allow only the hosts within the subnet 210.one.1.0 /24 to connect to the Digital server.
MLS(config-slb-vserver)# client 210.one.1.0 0.0.0.255
SLB may be the server finish’s respond to to HSRP, VRRP, and GLBP – but you still must comprehend it to become a CCNP! Understanding redundancy procedures and protocols is vital in currently’s networks, so make sure you’re at ease with SLB before taking up the Examination.