Rate Limiting of RPF Failure Traffic

When you enable rate limiting of packets that fail the RPF check (non-RPF packets), most non-RPF packets are dropped in hardware. According to the multicast protocol specification, the router needs to receive the non-RPF packets for the PIM assert mechanism to function properly, so all non-RPF packets cannot be dropped in hardware. When a non-RPF packet is received, a NetFlow entry is created for each non-RPF flow. When the first non-RPF packet arrives, the PFC bridges the pa..

Requirements and Constraints

Before delving into the typical topologies, it is wise to understand the overall network design process. As with any systems design effort, network design is an exercise in meeting new and old requirements while working within certain constraints. These constraints include money, labor, technology, space, and time. In addition, there may be social or political constraints, such as the mandated use of certain standards or vendors. Economic constraints play a major role in an..

Enabling Local Router Logging

Use the logging buffered configuration command to enable the local storage of router log messages: Router#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#logging buffered informational Router(config)#end Router# This feature causes the router to store all log messages to a revolving buffer called the logging buffer. Many network administrators find it convenient and useful to keep detailed router logs on the router itself..

Automating Dial Backup

This recipe includes several important features. First, notice that we have configured dial backup using an ISDN BRI interface on this router. So we have to set up the ISDN configuration: Router1(config)#interface BRI0/0 Router1(config-if)#isdn switch-type basic-ni Router1(config-if)#isdn spid1 800555123400 5551234 Router1(config-if)#isdn spid2 800555123500 5551235 This site is connected to a National ISDN switch. So we have defined the switch type to be basic-ni. If this h..

Exchanging Multicast Routing Information with MBGP

Before setting up MBGP, you should set up multicast-routing on the Autonomous System Boundary Router (ASBR) and configure it to block multicast traffic that you know is only intended for the local network: Router-ASBR1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router-ASBR1(config)#ip multicast-routing Router-ASBR1(config)#access-list 15 deny 239.0.0.0 0.255.255.255 Router-ASBR1(config)#access-list 15 deny 224.0.1.39 Router-AS..