Looking at RTF's BGP table in Example 11-36, you can see the AS_PATH information at the end of each line. Network 192.68.11.0/24 is learned via IBGP with AS_PATH 1 and via EBGP with AS_PATH 2 1. This means that if RTF wanted to reach 192.68.11.0/24 via IBGP, it could go to AS1, and if RTF wanted to reach 192.68.11.0/24 via EBGP, it would have to go via AS2 and then AS1. BGP always prefers the shortest path, which is why the path via IBGP with AS_PATH 1 is preferred. The > ..
Although hosting has been around almost as long as dedicated access services, it has become very popular over the past few years, with many service providers specializing in this market. Large providers that focus on dedicated hosting are commonly referred to as content providers. These providers usually develop highly fault-tolerant data center facilities that house cabinets or racks in which both enterprise and Web hosting customers can lease space and collocate servers and..
VPN Routing and Forwarding Tables
The overlapping addresses, usually resulting from usage of private IP addresses in customer networks, are one of the major obstacles to successful deployment of peer-to-peer VPN implementations. The MPLS/VPN technology provides an elegant solution to the dilemma: Each VPN has its own routing and forwarding table in the router, so any customer or site that belongs to that VPN is provided access only to the set of routes contained within that table. Any PE-router in an MPLS/VPN..
The Cisco router can be configured to behave like a broadcast medium over NBMA networks. OSPF sends a multicast hello and elects both the designated router and the backup designated router. The designated router provides protection from flooding. All changes are sent via the designated router. By increasing its priority, you can force your most reliable router to become the designated router. This model has a fundamental problem, however, in that it requires constant full mes..
Multilink PPP, abbreviated as MLP, MP, or MLPPP, defines a method to combine multiple parallel serial links at Layer 2. The original motivation for MLP was to combine multiple ISDN B-channels without requiring any Layer 3 load balancing; however, MLP can be used to load balance traffic across any type of point-to-point serial link. MLP balances traffic by fragmenting each packet based on the number of parallel links and then sending one fragment over each link. For each pack..
