Automatic Summary of router-like protocols

Show runBuilding configuration... Current configuration: 645 bytes! Version 12.3 service timestamps debug datetime msecservice timestamps log datetime msecno service password-encryption! Www.2cto.com hostname r1! Boot-start-markerboot-end-marker! Enable secret 5 $1 $ vMtl $ vyIqgd.05F/mZXt4J9d/r /! No aaa new-modelip subnet-zero !! No ip domain lookupip host r2 172.16.3.2! Ip cef !!!!!!!!!!!!!!! Interface FastEthernet0/0 description link to r2 ip address 172.16.3.1 255.255.255.252 duplex half www.2cto.com! Router rip network 172.16.0.0! Ip classlessno ip http server !!!!!!!!! Gatekeeper shutdown! Banner motd ^ CWelcome to r1 ^ C! Line con 0 stopbits 1 line aux 0 line vty 0 4 no login! Www.2cto.com! Endr1 # show ip routeCodes: C-connected, S-static, R-RIP, M-mobile, B-BGP D-VPN, EX-VPN external, O-OSPF, IA-OSPF inter area N1-ospf nssa external type 1, N2-ospf nssa external type 2 E1-OSPF external type 1, E2-OSPF external type 2 I-IS, su-IS summary, L1-IS level-1, L2-IS level-2 ia-IS inter area, *-candidate default, u-per-user static rout E o-ODR, P-periodic downloaded static routeGateway of last resort is not set 172.16.0.0/30 is subnetted, 2 subnetsR 172.16.3.4 [120/1] via 172.16.3.2, 00:00:07, fastEthernet0/0 // This Is Not summarized as 172.16.3.0 because it is in the same master network as the outbound interface and uses the same mask. C 172.16.3.0 is directly connected, FastEthernet0/0R 10.0.0.0/8 [120/1] via 172.16.3.2, 00:00:07, FastEthernet0/0r1 # r2Translating "r2" Trying r2 (172.16.3.2 )... openWelcom E to r2r2> enPassword: r2 # show runBuilding configuration... Current configuration: 977 bytes! Version 12.3 service timestamps debug datetime msecservice timestamps log datetime msecno service password-encryption! Www.2cto.com hostname r2! Boot-start-markerboot-end-marker! Enable secret 5 $1 $ KhLx $ ZAmF3HwWijRxDdjh4. bf10! No aaa new-modelip subnet-zero !! No ip domain lookupip host r1 172.16.3.1! Ip cef !!!!!!!!!!!!!!! Interface Loopback0 description test ip address 10.1.0.1 255.255.0.0! Www.2cto.com interface Loopback1 description test ip address 10.2.1.1 255.255.255.0! Interface Loopback2 description test ip address 10.3.0.1 255.255.0! Interface Loopback3 // if I change this test IP address to a non-30-bit mask. there is only one directly connected route of 172.16.3.0 in the IP address of r1. because it is different from the outbound mask. this route should be summarized and displayed as R 172.16.0.0/16. but because there is a better C 172.16.3.0/24. so R will be blocked. only directly connected route entries are left. description test ip address 172.16.3.5 255.255.255.252! Interface FastEthernet0/0 description link to r1 ip address 172.16.3.2 255.255.255.252 duplex half! Router rip network 10.0.0.0 network 172.16.0.0! Www.2cto.com ip classlessno ip http server !!!!!!!!! Gatekeeper shutdown! Banner motd ^ CWelcome to r2 ^ C! Line con 0 stopbits 1 line aux 0 line vty 0 4 no login !! Endr2 # show ip routeCodes: C-connected, S-static, R-RIP, M-mobile, B-BGP D-VPN, EX-VPN external, O-OSPF, IA-OSPF inter area N1-ospf nssa external type 1, N2-ospf nssa external type 2 E1-OSPF external type 1, E2-OSPF external type 2 I-IS, su-IS summary, L1-IS level-1, L2-IS level-2 ia-IS inter area, *-candidate default, u-per-user static route o-ODR, P-periodic downloaded static routeGateway of last resort is not set www.2cto.com 172.16.0.0/30 is subnetted, 2 subnetsC 172.16.3.4 is directly connected, loopback3C connector is directly connected, FastEthernet0/0 10.0.0.0/8 is variably subnetted, 3 subnets, 2 masksC 10.3.0.0/24 is directly connected, Loopback2C 10.2.1.0/24 is directly connected, loopback1C 10.1.0.0/16 is directly connected, Loopback0r2 # IGRP seems to be missing. the router igrp does not seem to exist. haha. this experiment cannot be done. the author has a peaceful mind