Route Map match Commands for Route Redistribution
Route maps use the match command to define the fields and values used for matching the routes being processed. If more than one match command is configured in a single route-map clause, a route is matched only if all the match commands’ parameters match the route. The logic in each match command itself is relatively straightforward. Table 11-2 lists the match command options when used for IGP route redistribution. Table 11-2 match Command Options for IGP Redistribution &n..
With the creation of a new breed of ISPs that want to interconnect with one another, offering the required connectivity while maintaining flexibility and control has become more challenging. Each provider has a set of rules, or policies, that describe what to accept and what to advertise to all other neighboring networks. Sample policies include determining route filtering from a particular ISP and choosing a particular path to a specific destination. The potential for variou..
A relatively deep knowledge of IP ACL configuration and use is assumed to be pre-requisite knowledge for readers of this book. In fact, many of the examples in the earlier sections of the book did not take the space required to explain the detailed logic of ACLs used in the examples. However, some reference information, as well as statements regarding some of the rules and practices regarding IP ACLs, is useful for general CCIE Routing and Switching exam study. Those details ..
All IP routing protocols use interface costs or metrics to determine the best path to a destination. RIP uses a hop count that does not take into account the speed or bandwidth of the interface. IGRP and EIGRP use a four-component metric that consists of delay, bandwidth, reliability, and load. By default, only the delay and bandwidth parameters calculate an IGRP or EIGRP metric. An OSPF metric is calculated from the bandwidth of the network interface. The default IS-IS metri..
High CPU Utilization Level Troubleshooting
The load on a switch’s CPU is often low, even under high utilization, thanks to the TCAM. Because the TCAM maintains a switch’s forwarding logic, the CPU is rarely tasked to forward traffic. The show processes cpu command that you earlier learned for use on a router can also be used on a Cisco Catalyst switch to display CPU utilization levels, as demonstrated in Example 5-19. Notice in the output in Example 5-19 that the switch is reporting a 19 percent CPU load, with ..
