The second branch in the local computation logic causes the EIGRP router to ask its neighbors about their current best route to a subnet, hoping to find an available, loop-free alternative route to that subnet. When no FS route is found, the EIGRP router goes active for the route. Going active is jargon for the process of changing a route’s status to active. Once the router is active, EIGRP multicasts Query messages to its neighbors, asking the neighbors if they have a vali..
The ultimate solution to rapidly growing Internet routing tables and IPv4 address depletion was the development of IPv6, which defines 128-bit source and destination addresses. At the risk of being derided 20 years from now, I’ll venture a guess that IPv6 has more addresses than we’ll ever need. IPv6 can support over a trillion, trillion IP addresses per person on the planet—with plenty of publicly routable addresses for everyone. Plus, the structure is well established..
CBWFQ Basic Features and Configuration
The CBWFQ scheduler guarantees a minimum percentage of a link’s bandwidth to each class/queue. If all queues have a large number packets, each queue gets the percentage bandwidth implied by the configuration. However, if some queues are empty and do not need their bandwidth for a short period, the bandwidth is proportionally allocated across the other classes. (Cisco does not publish the details of how CBWFQ achieves these functions.) Table 15-5 summarizes some of the key ..
Standard and extended access lists filter IP traffic. An access list is basically a set of permit or deny statements. Standard access lists control IP traffic based on the source address only. Extended access lists can filter on source and destination addresses. Extended access lists can also filter on specific protocols and port numbers. This section covers how a Cisco router handles access lists. Access Lists on Cisco Routers By default, a Cisco router permits all IP and ..
Supported Cisco Platforms for Frame Relay to ATM Interworking
This section presents an overview of the Cisco router platforms that support the Frame Relay to ATM Interworking feature. During the early development stage, not all Cisco router platforms offer the support for the Frame Relay to ATM interworking function. The early supported router platforms include the Cisco MC3810, the Cisco 2600 series, the Cisco 3600 series, and the Cisco 7200 series. For Cisco IOS software support, the Frame Relay to ATM Interworking feature is availab..
