Using Sync and Redistributing Routes

BGP synchronization is best understood when considered in the context in which it was intended to be used—namely, in conjunction with the redistribution of BGP routes into the IGP. This method is seldom used by ISPs today, mainly because of the large number of routes that would be injected into the IGP. However, using BGP sync in conjunction with redistribution solves both problems related to the routing black hole. The key to understanding BGP sync is to know that redistr..

Using Distribute List in RIPV2

The distribute list feature is very important for controlling routing information. In some situations, certain routes may be undesirable in the routing table. For example, you may want to send a default route only on certain interfaces. In addition, you may want to block certain routes when redistributing between routing protocols.   The distribute list is very useful, especially when you have performed redistribution in the network. Observe the network shown in F..

Configuring Frame Relay PIPQ

This section looks at the configuration tasks for enabling the Frame Relay PIPQ feature on Cisco routers. Take note that Frame Relay Traffic Shaping or FRF.12 is not required for Frame Relay PIPQ to work. Frame Relay PIPQ can work with or without these features. However, recall that when Frame Relay Traffic Shaping is enabled on a Frame Relay interface, the two-level queuing hierarchy is created on the interface. With Frame Relay Traffic Shaping and the two-level queuing stru..

Modifying the Default RIP Parameters

There are several customizations that we can make to the default RIP configuration. You can modify the timers by using the timers command in the RIP configuration mode: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#ipv6 unicast-routing Router1(config)#ipv6 router rip RIP_PROC Router1(config-rtr)#timers 15 60 5 120 Router1(config-rtr)#exit Router1(config)#end Router1# You can change the default administrative ..

RIP Route Summarization

Summarizing routes in RIP Version 2 improves scalability and efficiency in large networks. Summarizing IP addresses means that there is no entry for child routes (routes that are created for any combination of the individual IP addresses contained within a summary address) in the RIP routing table, reducing the size of the table and allowing the router to handle more routes. Summary IP address functions more efficiently than multiple individually advertised IP routes for the..