Smallest Multi-Exit Discriminator

The purpose of the MED (or MULTI_EXIT_DISC) is to allow routers in one AS to tell routers in a neighboring AS how good a particular route is. In fact, because of how MED works, it is often called the BGP metric, even though it is not close to the top of the BGP decision process. Figure 13-11 shows a classic case for the use of MED, where a customer has two links connecting it to a single ISP. The ISP, aware of its best routes for 11.0.0.0/8 and 12.0.0.0/8, can set MED so that..

Verifying the Configuration of Attributes

It is always important to be able to check your work, particularly when that work defines an entire organization's method of connecting to the Internet.  The show ip bgp command shows attribute values and status. It is a good command to verify configuration changes and manage the traffic flow to and from the autonomous system.  Example 16-5 shows how BGP is running before the configuration in Example 16-2. The next hop is to 100.2.3.2, which is in autonomous syste..

Enabling the OSPF Routing Protocol

To configure OSPF as the routing protocol, use the following command: Router(config)#router ospf process-number  Here, process-number is not globally significant. It is possible to have more than one process running on a router (although that would be an unusual configuration) and two OSPF processes could route for different parts of the network. The process number does not have to be the same on every router in the area. 

Security Policy Best PracticesA Cisco View

Cisco released a number of excellent SAFE blueprints containing security design guideless. The material at http://www.cisco.com/safe is a must read for any IP engineer or designer. Too many organizations have not followed the fundamental crucial step of developing a security policy upon which to base all security strategies. Any network without a security policy is liable to be compromised, because when an event does occur, there are no processes in place to mitigate the eve..

Configuring Adaptive Frame Relay Traffic Shaping for Interface Congestion

The Frame Relay Traffic Shaping feature must be enabled on the interface in order to use Adaptive Frame Relay Traffic Shaping for Interface Congestion. Refer to Chapter 5 for the configuration tasks required to enable Frame Relay Traffic Shaping. To configure Adaptive Frame Relay Traffic Shaping for Interface Congestion, perform the configuration steps listed below: Step 1.     Enter the interface configuration mode of the serial interface and enable Frame Re..