Configuring Advanced EIGRP Options参考.ppt

Configuring EIGRP Configuring Advanced EIGRP Options EIGRP Route Summarization: Automatic Purpose: Smaller routing tables, smaller updates Automatic summarization: On major network boundaries, subnetworks are summarized to a single classful (major) network. Automatic summarization occurs by default. EIGRP Route Summarization: Manual Manual summarization has the following characteristics: Summarization is configurable on a per-interface basis in any router within a network. When summarization is configured on an interface, the router immediately creates a route pointing to null0. Loop-prevention mechanism When the last specific route of the summary goes away, the summary is deleted. The minimum metric of the specific routes is used as the metric of the summary route. Configuring Route Summarization Manually Summarizing EIGRP Routes Router C Routing Table EIGRP Load Balancing Routes with a metric equal to the minimum metric are installed in the routing table (equal-cost load balancing). There can be up to six entries in the routing table for the same destination: The number of entries is configurable. The default is four. Set to 1 to disable load balancing. EIGRP Unequal-Cost Load Balancing Variance Example Configuring WAN Links EIGRP supports different WAN links: Point-to-point links NBMA Multipoint links Point-to-point links EIGRP uses up to 50% of bandwidth by default; this bandwidth utilization can be changed. Bandwidth Utilization over WAN Interfaces Bandwidth utilization over point-to-point subinterfaces using Frame Relay: Treats bandwidth as T1 by default Should manually configure bandwidth as the CIR of the PVC Bandwidth utilization over multipoint Frame Relay, ATM, and ISDN PRI: EIGRP uses the bandwidth on the physical interface divided by the number of neighbors on that interface to calculate the bandwidth attributed per neighbor. Bandwidth Utilization over WAN Interfaces (Cont.) Each PVC can have a different CIR, creating an EIGRP packet-pacing probl