Automatically Recover from Error Conditions
By default, ports put into the errdisable state must be re-enabled manually. This is done by issuing the shutdown command in interface configuration mode, followed by the no shutdown command. Before you re-enable a port from the errdisable condition, you always should determine the cause of the problem so that the errdisable condition doesn’t occur again. You can decide to have a switch automatically reenable an errdisabled port if it is more important to keep..
Drawing Tools Available to Create Your Data Center Layout
Part of creating a productive Data Center is a logical layout of all its constituent parts. From air handlers to electrical panels, sprinkler pipes to server rows, floor tiles to telephones, you must specify not only what components go in your server environment but also where exactly the components are to be located. One of the most effective ways to communicate the layout is the creation of a detailed map of the Data Center. While it is possible to create an informative de..
Level 1 router summarization is done only for external routes (redistributed routes from other protocols) because the level 1 router does not receive any routes from the level 2 routers. As such, there is no need to summarize routes from level 2 routers—you can summarize both level 1 and external routes in level 2. External routes can be summarized only at the redistributing router. After the LSP is originated, it cannot be summarized. Summarizing of external ..
Configuring Static and Dynamic DLCI to Network Layer Address Mapping
Before a Frame Relay router or access server can transmit frames on its outgoing virtual circuit to a remote destination, it needs a vital piece of information. The router needs to understand the relationship between the specified next hop protocol address of the remote destination and the specific DLCI of a local outgoing virtual circuit. In other words, before a Cisco router is able to transmit data to a remote destination over Frame Relay, it needs to know which DLCI to us..
Automatic summarization, also called auto-summary, causes a router to automatically advertise a summary route under certain conditions, without the use of the ip summary-address command. When using auto-summary, if a router has interfaces in more than one Class A, B, or C network, then that router will advertise a single summary route for an entire Class A, B, or C network into the other classful network, rather than advertise routes for the individual subnets. The following ..
