CCNP Certification / BCMSN Examination Tutorial: Server Load Balancing (SLB)
If you’re working on your BCMSN Examination on your approach to CCNP certification, you’ll read at duration regarding how Cisco routers and multilayer switches can operate to supply router redundancy – but there’s Yet another beneficial assistance, Server Load Balancing, that does exactly the same for servers. Even though HSRP, VRRP, and CLBP all signify many Actual physical routers to hosts as an individual virtual router, SLB signifies numerous physical servers to hosts as an individual virtual server.
In the subsequent illustration, 3 physical servers have been placed in the SRB team ServFarm. They’re represented to the hosts as being the virtual server 210.1.one.fourteen.
The hosts will look for to communicate with the server at 210.one.1.14, not knowing which they’re truly speaking with the routers in ServFarm. This allows rapid cutover if one of the physical servers goes down, and in addition serves to cover the actual IP addresses of your servers in ServFarm.
The essential functions of SLB includes making the server farm, followed by generating the Digital server. We’ll first insert 210.one.one.eleven towards the server farm:
MLS(config)# ip slb serverfarm ServFarm
MLS(config-slb-sfarm)# real 210.1.one.11
MLS(config-slb-real)# inservice
The 1st command creates the server farm, with the actual command specifying the IP deal with of the true server. The inservice command is needed by SLB to consider the server as Prepared to handle the server farm’s workload. The true and inservice commands must be repeated for every server within 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.one.14
MLS(config-slb-vserver)# inservice
In the prime down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. The virtual server is assigned the IP handle 210.one.one.fourteen, and connections are allowed after the inservice command is applied.
You may also want to control which within your network hosts can connect to the 먹튀검증 Digital server. If hosts or subnets are named Using the client command, These would be the only consumers which can hook up with the virtual server. Notice that this command makes use of wildcard masks. The subsequent configuration would make it possible for only the hosts within the subnet 210.1.1.0 /24 to connect with the Digital server.
MLS(config-slb-vserver)# customer 210.one.1.0 0.0.0.255
SLB would be the server finish’s reply to HSRP, VRRP, and GLBP – but you still have to comprehend it to become a CCNP! Recognizing redundancy tactics and protocols is significant in right now’s networks, so ensure that you’re relaxed with SLB prior to taking over the exam.