My topology is: [![Topology][1]][1] I am logged in to R1. I can ping 10.0.0.2 on R2 and 198.51.100.1 on R2, but can't ping the management IP of sw3(198.51.100.2). What am I doing wrong? R1#sh ip arp Protocol Address Age (min) Hardware Addr Type Interface Internet 10.0.0.1 - 0cc1.8f5a.c102 ARPA GigabitEthernet0/2 Internet 10.0.0.2 11 0cc1.8fc5.c701 ARPA GigabitEthernet0/2 Internet 10.0.0.5 - 0cc1.8f5a.c101 ARPA GigabitEthernet0/1 Internet 10.0.0.6 11 0cc1.8f0b.af00 ARPA GigabitEthernet0/1 Internet 192.0.2.1 - 0cc1.8f5a.c100 ARPA GigabitEthernet0/0 Internet 192.0.2.2 11 0cc1.8fe9.8001 ARPA GigabitEthernet0/0 R1#sh ip route Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP 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-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP a - application route + - replicated route, % - next hop override, p - overrides from PfR Gateway of last resort is not set 10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks C 10.0.0.0/30 is directly connected, GigabitEthernet0/2 L 10.0.0.1/32 is directly connected, GigabitEthernet0/2 C 10.0.0.4/30 is directly connected, GigabitEthernet0/1 L 10.0.0.5/32 is directly connected, GigabitEthernet0/1 192.0.2.0/24 is variably subnetted, 2 subnets, 2 masks C 192.0.2.0/24 is directly connected, GigabitEthernet0/0 L 192.0.2.1/32 is directly connected, GigabitEthernet0/0 S 198.51.100.0/24 [1/0] via 10.0.0.2 R1#ping 198.51.100.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 198.51.100.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 6/13/16 ms R1#ping 198.51.100.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 198.51.100.2, timeout is 2 seconds: ..... Success rate is 0 percent (0/5) ---------- Here are the running configs for each device: R1: R1#sh run | s net0/2 interface GigabitEthernet0/2 description Connected to R2 ip address 10.0.0.1 255.255.255.252 duplex auto speed auto media-type rj45 R1#sh ip int br Interface IP-Address OK? Method Status Protocol GigabitEthernet0/0 192.0.2.1 YES manual up up GigabitEthernet0/1 10.0.0.5 YES manual up up GigabitEthernet0/2 10.0.0.1 YES manual up up GigabitEthernet0/3 unassigned YES unset administratively down down R2: R2#ping 198.51.100.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 198.51.100.2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 8/16/23 ms R2#sh run | s net0/0 interface GigabitEthernet0/0 description Connected to sw2 ip address 198.51.100.1 255.255.255.0 duplex auto speed auto media-type rj45 R2#sh run | s net0/1 interface GigabitEthernet0/1 description Connected to R1 ip address 10.0.0.2 255.255.255.252 duplex auto speed auto media-type rj45 R2#sh ip int br Interface IP-Address OK? Method Status Protocol GigabitEthernet0/0 198.51.100.1 YES manual up up GigabitEthernet0/1 10.0.0.2 YES manual up up GigabitEthernet0/2 unassigned YES unset administratively down down GigabitEthernet0/3 unassigned YES unset administratively down down R2#sh ip route Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP 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-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP a - application route + - replicated route, % - next hop override, p - overrides from PfR Gateway of last resort is not set 10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks C 10.0.0.0/30 is directly connected, GigabitEthernet0/1 L 10.0.0.2/32 is directly connected, GigabitEthernet0/1 198.51.100.0/24 is variably subnetted, 2 subnets, 2 masks C 198.51.100.0/24 is directly connected, GigabitEthernet0/0 L 198.51.100.1/32 is directly connected, GigabitEthernet0/0 sw2: sw2#sh run | s net0/0 interface GigabitEthernet0/0 description Connected to R2 media-type rj45 negotiation auto sw2#sh run | s vlan vlan internal allocation policy ascending sw2#sh run | s Vlan interface Vlan1 ip address 198.51.100.2 255.255.255.0 sw2#sh ip int br Interface IP-Address OK? Method Status Protocol GigabitEthernet0/0 unassigned YES unset up up GigabitEthernet0/1 unassigned YES unset administratively down down GigabitEthernet0/2 unassigned YES unset administratively down down GigabitEthernet0/3 unassigned YES unset administratively down down Vlan1 198.51.100.2 YES manual up up [1]: https://i.sstatic.net/vM1pu.png