Route Map set Commands for Route Redistribution
When used for redistribution, route maps have an implied action—either to allow the route to be redistributed or to filter the route so that it is not redistributed. As described earlier in this chapter, that choice is implied by the permit or deny option on the route-map command. Route maps can also change information about the redistributed routes by using the set command. Table 11-3 lists the set command options when used for IGP route redistribution. Table 11-3 set Com..
Summarization hides details in order to simplify the routing process. One of the keys to scalable routing is to take large complicated sets of advertisements and reduce them as much as possible. Summarization reduces router resource consumption (CPU and memory) required to store and process routes by reducing the number of routes. Summarization also saves network capacity, because fewer advertisements are required and each advertisement is smaller. Summarization also hi..
This section describes the process of summarization. Summarization is the technique of grouping IP networks together to minimize advertisements. For instance, imagine that a division's network consisted of the subnets 172.21.0.0/24 through 172.21.255.0/24. To advertise each network using a routing protocol, the division will send 256 advertisements to other divisions. To extend the example, consider Figure 2-4. There are many routers in this company, but the three rou..
This section concludes the coverage of PIM-DM. Table 20-2 lists the key PIM-DM messages covered in this chapter, along with a brief definition of their use. Table 20-2 Summary of PIM-DM Messages The next two short sections introduce two other dense-mode protocols, DVMRP and MOSPF
Several options exist to meet strict SLA considerations for loss, delay, and jitter in the service-provider MPLS VPN core: • Aggregate bandwidth overprovisioning • DiffServ in the backbone • MPLS traffic engineering (which might or might not be used in conjunction with DiffServ in the backbone) Aggregate Bandwidth Overprovisioning Aggregate bandwidth overprovisioning is a common trend in the service-provider backb..
