This section demonstrates how metrics can be used by one AS to influence routing decisions of another AS. In Figure 11-8, AS3 is the customer of provider AS1. AS3 wants to generate metrics toward AS1 to influence inbound traffic. In case all BGP attributes are the same, BGP will prefer routes with a lower metric over routes with a higher metric. Figure 11-8. Setting the MED Attribute RTA and RTF are running IBGP internally and EBGP with the provider AS1. RTG is an int..
Impact of the Decision Process and NEXT_HOP on BGP Updates
The next several examples together show a sequence of events regarding the propagation of network 31.0.0.0/8 by BGP throughout the network of Figure 12-4. R6 originated the routes in the 30s (as in Example 12-4) by redistributing EIGRP routes learned from R9. The purpose of this series of examples is to explain how BGP chooses which routes to include in Updates under various conditions. The first example, Example 12-9, focuses on the commands used to examine what R6 sends to..
Multipath interference occurs when an RF signal takes different paths when propagating from one wireless station to another. While the signal is en route, walls, chairs, desks, and other items get in the way and cause the signal to bounce in different directions. A portion of the signal might go directly to the destination, and another part might bounce from a chair to the ceiling, and then to the destination. As a result, some of the signal will encounter delay, because it h..
Deploying IS-IS on Specific Topologies
This section talks about deploying IS-IS on specific topologies, starting with redistribution and working through full mesh, hub and spoke, and point-to-point broadcast links. It concludes with a discussion of links that are parallel to an L1/L2 boundary. Redistribution Redistribution into IS-IS follows the simple and normal pattern of redistribution into all routing protocols in Cisco IOS Software; you use the redistribution command in the router isis configuration mode. A..
For Classical IP over ATM, you must define at least one ATMARP server: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#interface ATM1/0 Router1(config-if)#no ip address Router1(config-if)#atm ilmi-keepalive Router1(config-if)#pvc 0/5 qsaal Router1(config-if-atm-vc)#exit Router1(config-if)#pvc 0/16 ilmi Router1(config-if-atm-vc)#exit Router1(config-if)#exit Router1(config)#interface ATM1/0.1 multipoint Router1(confi..
