Finding an Alternative Path to a Remote Network
When the path to a network is lost, EIGRP goes to a lot of trouble to find an alternative path. The method that EIGRP uses to find alternative paths is very reliable and very fast. The following list describes the process after a neighbor goes offline: 1. The router marks the routes that were reached by sending the traffic to that neighbor. 2. The router looks in the topology table, which has every advertisement received, to determine whether there is an alterna..
This section discusses how to configure IPX addresses on LAN and WAN interfaces for Cisco routers. We also discuss the configuration of the four IPX LAN interface encap-sulations used in an IPX environment. LAN Interface Configuration All Cisco routers that are routing IPX have a unique IPX network.node address on each of the attached LAN segments. This address enables the router to know which networks are connected to each interface and where packets for those networks sho..
Introduction to the Distance-Vector Protocol
In a distance-vector protocol, each router or host that participates in the routing protocol maintains information about all other destinations within the autonomous system. This does not indicate that each router knows which router originated the information, as in link state, but each router is aware of the neighbor that will be used to reach that destination. Each entry in the routing table includes the next hop, to which the datagram should be sent on its route to the des..
The remaining sections of this chapter focus on the Frame Relay PIPQ feature. The Frame Relay PIPQ feature works by providing a PQ scheme at the interface level. Similar to the generic PQ feature enabled at the interface level for nonserial interfaces or other encapsulation types, the Frame Relay PIPQ feature provides four queues of ascending levels of priority: low, normal, medium, and high. NOTE The Frame Relay PIPQ feature is supported in Cisco IOS Release 12.1(1)T and l..
Configuring DLCI Priority Levels
DLCI priority level is a legacy traffic management tool that allows users to prioritize multiple parallel Frame Relay DLCIs based on the types of Frame Relay traffic that are carried. DLCI priority level can be used to alleviate congestion for certain types of traffic by allowing users to define different DLCIs for different categories of traffic based on traffic priorities. For example, DLCI priority level is useful in situations in which delay-sensitive traffic is mixed wit..
