Injecting Information Dynamically into BGP
1420. Injecting Information Dynamically into BGP The following example demonstrates how routing information can be injected dynamically into BGP. Consider Figure 11-4. Figure 11-4. Injecting Routes into BGP Assume that AS3 is getting Internet connectivity from AS1. AS3 is running OSPF as an IGP inside the AS and is running EBGP with AS1. On the other hand, AS3 also has one customer, C1, with the following criteria: • C1 is pointing a default toward AS3. • C1 adv..
When CB Policing re-marks packets instead of discarding them, the design might call for marking more than one field in a packet. For instance, when transmitting into a Frame Relay cloud, it might be useful to mark both DSCP and FR DE when a packet violates the contract. Marking multiple fields in the same packet with CB Policing is called multi-action policing. The police command uses a slightly different syntax to implement multi-action policing. By omitting the actions fro..
RSVP is a per-flow protocol that requests a bandwidth reservation from every node in the path of the flow. In its simplest form, RSVP is a unidirectional protocol, so if a bidirectional reservation is required for a flow, both endpoints must initiate a request for a reservation. Basic RSVP protocol operation is shown in Figure 8-1 and its configuration in Example 8-1. The endpoints, or other network devices on behalf of the endpoints, send unicast signaling messages to estab..
An AP can provide WLAN connectivity to only the clients within its range. The signal range is roughly defined by the AP’s antenna pattern. In an open-air setting, this might be a circular shape surrounding an omnidirectional antenna. At least the pattern will appear as a circle on a floor plan—keep in mind that the pattern is three-dimensional, also affecting floors above and below, in a multilevel building. The AP’s location must be carefully planned so that its range..
There are several OSPF debugging options. But usually, if there is an OSPF problem, you will see it as instabilities in the neighbor relationships. So the most useful debugging option traces the formation of adjacencies. Router3#debug ip ospf adj OSPF adjacency events debugging is on Router3# This particular debug output is particularly useful because it helps to diagnose problems when routers fail to form adjacencies with one another. For example, the following debug mess..
