Using Route Summarization to Create Default Routes
Generally speaking, route summarization combines smaller address ranges into a small number of larger address ranges. From that perspective, 0.0.0.0/0 is the largest possible summary, because it includes all possible IPv4 addresses. And, as it turns out, EIGRP route summarization supports summarizing the 0.0.0.0/0 supernet, effectively creating a default route. Because route summarization causes a null route to be created for the summary, some Cisco documentation advises agai..
Troubleshooting OSPFv3 for IPv6 should be handled in the same way as OSPFv2 for IPv4. The major difference will be the addressing: OSPFv3 uses the link-local addresses as the source and, when sending directly to a neighbor, destination of packets. Case Study: Frame Relay Mapping Upon initial configuration of Figure 9-17, Skrewt and Hippogriff are configured with the configurations in Example 9-20 and Example 9-21. Example 9-20. Skrewt's initial Frame Relay mapping configur..
Strive for Operational Simplicity
Network designers make decisions regarding operational complexity every day. Most don't call it that, though; they tend to think along the lines of the difficulty and burden that specific technology places on administrators or users. This section gets to a key aspect of your network security system: achieving operational simplicity can mean the difference between a security system that works for you and a security system that you work for. Some hard and soft metrics to measu..
The nature of wireless communications makes defending against attacks very difficult but extremely necessary. Threats come in many forms. The vulnerability and exposure of your network comes from inside and outside your network. Arguably, the internal troubles typically outnumber the external threats. Security threats surface as disruption in service, unintentional leaks, and industrial espionage. Both professionals and amateurs carry out attacks against WLAN security shortc..
Configuring EIGRP Metric Components (K-values)
EIGRP calculates its integer metric, by default, using a formula that uses constraining bandwidth and cumulative delay. You can change the formula to use link reliability, link load, and even disable the use of bandwidth and/or delay. To change the formula, an engineer can configure five weighting constants, called k-values, which are represented in the metric calculation formula as constants k1, k2, k3, k4, and k5. From a design perspective, Cisco strongly recommends against..
