Преглед на кода на CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)

When you happen to be working on your BCMSN exam on your way to CCNP certification, you are going to read at length about how Cisco routers and multilayer switches can work to deliver router redundancy - but there's another beneficial service, Server Load Balancing, that does the very same for servers. Whilst HSRP, VRRP, and CLBP all represent a number of physical routers to hosts as a single virtual router, SLB represents many physical servers to hosts as a single virtual server. In the following instance, 3 physical servers have been placed into the SRB group ServFarm. They're represented to the hosts as the virtual server 210.1.1.14. The hosts will seek to communicate with the server at 210.1.1.14, not recognizing that they are truly communicating with the routers in ServFarm. This allows quick cutover if one of the physical servers goes down, and also serves to hide the actual IP addresses of the servers in ServFarm. The standard operations of SLB involves producing the server farm, followed by building the virtual server. We'll 1st add 210.1.1.11 to the server farm: MLS(config)# ip slb serverfarm ServFarm MLS(config-slb-sfarm)# true 210.1.1.11 MLS(config-slb-genuine)# inservice The initial command creates the server farm, with the true command specifying the IP address of the real server. The inservice command is expected by SLB to think about the server as prepared to handle the server farm's workload. The real and inservice commands must be repeated for each and every server in the server farm. To create the virtual server: MLS(config)# ip slb vserver VIRTUAL_SERVER MLS(config-slb-vserver)# serverfarm ServFarm MLS(config-slb-vserver)# virtual 210.1.1.14 MLS(config-slb-vserver)# inservice From the top rated down, the vserver was named VIRTUAL_SERVER, which represents the server farm ServFarm. [http://readyvirtual.blogspot.com/2013/12/phone-answering-services-how-we-get-our.html Phone Answering] contains further concerning the inner workings of it. The virtual server is assigned the IP address 210.1.1.14, and connections are permitted as soon as the inservice command is applied. You may possibly also want to control which of your network hosts can connect to the virtual server. If hosts or subnets are named with the client command, these will be the only customers that can connect to the virtual server. Note that this command utilizes wildcard masks. For further information, please consider checking out: [http://readyvirtualblog.wordpress.com/2013/12/27/phone-answering-services-how-we-get-our-clients-set-up-with-a-virtual-receptionist/ phone answering service]. The following configuration would permit only the hosts on the subnet 210.1.1. /24 to connect to the virtual server. MLS(config-slb-vserver)# client 210.1.1. ..255 SLB is the server end's answer to HSRP, VRRP, and GLBP - but you nevertheless desire to know it to become a CCNP! Figuring out redundancy approaches and protocols is essential in today's networks, so make certain you happen to be comfy with SLB before taking on the exam. My brother learned about [http://readyvirtual.blogspot.com/2013/12/phone-answering-services-how-we-get-our.html answering service] by browsing Bing. This cogent [http://readyvirtual.tumblr.com/post/71256263754/phone-answering-services-how-we-get-our-clients-set-up compare live receptionist] essay has various staggering aids for why to study it.

CCNP Certification / BCMSN Exam Tutorial: Server Load Balancing (SLB)