The BGP attributes are a set of parameters used to keep track of route-specific information such as path information, degree of preference of a route, NEXT_HOP value of a route, and aggregation information. These parameters are used in the BGP filtering and route decision process. Every UPDATE message has a variable-length sequence of path attributes. A path attribute is a triple of the form <attribute type, attribute length, attribute value>. The attribute type is a 2-..
Subsequent chapters show techniques for summarizing routes for each of the routing protocols described in this book. However, it is important that you understand how to compose the summary address. The method for determining the summary is Step 1. Write each network in binary. Step 2. Determine the number of bits that match. This gives a single summary that includes all the routes, but may include a range of addresses that is too large(also called over-summarization). Step 3..
One common security truism is "Once you have physical access to a box, all bets are off." This is a good beginning assumption for this section. If an attacker has physical access to a computer, router, switch, firewall, or other device, your security options are amazingly limited. Networking devices, with few exceptions, can have their passwords reset by attaching to their console port. Hosts can be booted with a special floppy disk or CD-ROM designed to circumvent most host ..
The Cisco Intrusion Detection System (IDS) provides an in-depth, self-healing mechanism to provide network administrators a defense against attacks from inside and outside the network. The Cisco definition of a self-healing network is a network that is intelligent enough to stop unwanted traffic and correct any security vulnerabilities before they occur. Beginning with Cisco IDS 4.0, the network IDS sensors use the Remote Data Exchange Protocol (RDEP) for communication. With..
AutoQoS is an extremely useful feature that can take a lot of the mystery out of building a QoS policy. Unfortunately, there are several restrictions on this feature that you need to be aware of. First, it is only available on point-to-point links between routers. This includes point-to-point subinterfaces on ATM and Frame Relay PVCs, as shown in the example. The feature is also available on PPP and HDLC Serial connections. It cannot be used on any multiple access media, inc..
