Dynamic Host Configuration Protocol
Dynamic Host Configuration Protocol (DHCP) is defined in RFC 1531 (latest RFC 2131) and provides a comprehensive method of allocating IP addresses, subnet mask, gateway address, DNS server, WINS servers, and many more parameters for IP devices. DHCP clients send messages to the server on UDP 67, and servers send messages to the client on UDP 68. Cisco routers can also be configured for DHCP. Example 2-3 configures a Cisco IOS router to allocate the entire range 131.108.1.0/24..
Defining Requirements and Roles
Assuming you have decided that building your own Data Center is the right business decision, then the first step in a successful Data Center project is defining the room's purpose. Why is your company building this Data Center? What needs must it meet? What specific functions does it need to perform, and perform well, to be considered a success? What level of availability does your business require? These are obvious questions, but in the rush to get your complex, potentially..
Because of the use of radio waves, wireless LANs is susceptible to several sources of RF interference. Interfering signals cause delay and reduce throughput. If no 802.11 frame transmissions are in process when the interference is present, then the result will be medium access delays. In some cases, this delay can be indefinite. RF interference causes data frames in transit to become corrupted, resulting in a retransmission. The destination disregards the incoming frame, bec..
To successfully manage any network, timely and accurate information is required. Not only is current and up-to-date information necessary (that is, "snapshots" of the WLAN in its current state), but also historical reporting capabilities are required to help identify trends. Additionally, alerting capabilities are important. WLAN reporting includes three related areas, as described in the following sections: • Standard/systematic reports • &nb..
Configuring a PAgP EtherChannel
To configure switch ports for PAgP negotiation (the default), use the following commands: Switch(config)# interface type mod/num Switch(config-if)# channel-protocol pagp Switch(config-if)# channel-group number mode {on | {{auto | desirable} [non-silent]}} On all Cisco IOS–based Catalyst models, you can select between PAgP and LACP as a channel-negotiation protocol. Some older models, however, offer only PAgP, so the channel-protocol command is not available. Each inte..
