Using Regular Expressions to Match AS_PATH
A Cisco IOS AS_PATH filter has one or more configured lines, with each line requiring a regex. The logic is then applied as follows: 1. The regex of the first line in the list is applied to the AS_PATH of each route. 2. For matched NLRI, the NLRI is passed or filtered based on that AS_PATH filter’s configured permit or deny action. 3. For unmatched NLRI, Steps 1 and 2 are repeated, using the next line in the AS_PATH filter, analyzing all NLRI yet to be matched by this ..
Differentiated Packet Servicing
Conventional IP packet forwarding uses only the IP destination address contained within the Layer 3 header within a packet to make a forwarding decision. The hop-by-hop destination-only paradigm used today prevents a number of innovative approaches to network design and traffic flow optimization. In Figure C-2, for example, the direct link between the San Francisco core router and the Washington core router forwards the traffic entering the network in any of the Bay Area Poin..
Example 11-5 shows the status of the show frame-relay map command at R1, after the Frame Relay SVC configurations are completed. In the show frame-relay map output shown in Example 11-5, the output shows that the Frame Relay connection is an SVC circuit and broadcast traffic is allowed to be sent over the SVC. IETF encapsulation is used. Example 11-5. show frame-relay map Output R1#show frame-relay map Serial4/0.1 (up): point-to-point dlci, dlci 100(0x64,0x1840), broadcast, ..
The solution to this problem is similar to the RIP solution. First we have to enable the routing protocol on the CE routers, which we do in the usual way: Router-CE-A1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router-CE-A1(config)#router eigrp 156 Router-CE-A1(config-router)#network 192.168.1.0 Router-CE-A1(config-router)#network 192.168.5.0 Router-CE-A1(config-router)#no auto-summary Router-CE-A1(config-router)#end Router-C..
Network planning is an important phase of any network implementation project because good network planning can ensure your network is able to transport your critical traffic reliably. Whether purchasing a Frame Relay service from a service provider or setting up a private enterprise Frame Relay network, a network planner has to consider many important factors. During the network planning stage, network designers or architects engage in activities to identify and gather requir..
