CCNP课程详解-1-1-EIGRP介绍 (3).pptVIP

Configuring EIGRPConfiguring Advanced EIGRP Options EIGRP Route Summarization: AutomaticPurpose: Smaller routing tables, smaller updatesAutomatic summarization:On major network boundaries, subnetworks are summarized to a single classful (major) network.Automatic summarization occurs by default. EIGRP Route Summarization: ManualManual 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 mechanismWhen 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. no auto-summary (config-router)#Turns off automatic summarization for the EIGRP processConfiguring Route Summarizationip summary-address eigrp as-number address mask [admin-distance](config-if)#Creates a summary address that this interface will generate Manually Summarizing EIGRP Routes Router C Routing TableRouterC#show ip route<output omitted> Gateway of last resort is not set 172.16.0.0/16 is variably subnetted, 3 subnets, 2 masksD 172.16.0.0/16 is a summary, 00:00:04, Null0D 172.16.1.0/24 [90/156160] via 10.1.1.2, 00:00:04, FastEthernet0/0D 172.16.2.0/24 [90 via 10.2.2.2, 00:00:04, Serial0/0/1C 192.168.4.0/24 is directly connected, Serial0/0/0 10.0.0.0/8 is variably subnetted, 3 subnets, 2 masksC 10.2.2.0/24 is directly connected, Serial0/0/1C 10.1.1.0/24 is directly connected, FastEthernet0/0D 10.0.0.0/8 is a summary, 00:00:05, Null0RouterC# EIGRP DUALThe DUAL finite state machine decision process is a follows:Tracks all routes advertised by neighborsSelects loop-free path using a successor and remembers any feasible successorsIf the successor is lost, uses a feasible successorIf there is no feasible successor, queries neighbors and recomputes a new su