Finally, in addition to pricing, backbone, and interconnection issues, customers should consider demarcation point (DP) issues when selecting an ISP and executing an agreement. A demarcation point is the point that differentiates the provider's network and responsibilities from the customer's network and responsibilities. This is particularly true in a service provider's dedicated hosting environment. It is important to understand the difference between the responsibilities o..
Revision Control of IOS Configuration Files
All IOS configuration changes should be recorded and, if possible, a reason for each change should be logged. Such revision control may be achieved with a commercial package, such as CiscoWorks; or with public domain software, such as RCS. In the latter case, good results can be achieved simply by following these guidelines: Always write modified router configurations to a tftp server, using a well-known name for each router configuration file. Hav..
The Distributed Update Algorithm
Distributed Update Algorithm (DUAL) is used by Enhanced IGRP to achieve fast, loop-free convergence with little impact on CPU cost and overhead. DUAL involves only the nodes affected by topology change and takes corrective action, such as sending queries about the lost route across only the affected nodes. Nodes that are unaffected simply reply that they have an alternate path. DUAL works well when more than one change occurs simultaneously because only the affe..
In the case of the router-on-a-stick design, traffic flows to the router within the source VLAN where it is routed into the destination VLAN. This created an out and back flow to the router. Technically, the Catalyst 5000 RSM uses a very similar flow, but with one important difference: the stick becomes the Catalyst 5000 backplane (the high-speed switching path used inside the Catalyst chassis). This difference provides two key benefits: • Speed • Integration ..
To automatically adjust the router time to account for the new extended Daylight Saving Time, starting in March 2007, use the following commands: Router2#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router2(config)#clock timezone EST -5 Router2(config)#clock summer-time EDT recurring 2 Sun Mar 2:00 1 Sun Nov 2:00 Router2(config)#end Router2# The U.S. Energy Policy Act of 2005 includes changes to extend Daylight Saving Time (DST) by ..
