Below shows the routing table on RT1:
RT1#sh ip route Gateway of last resort is not set 172.16.0.0/24 is subnetted, 3 subnets R 172.16.1.0 [120/1] via 10.10.10.2, 00:00:16, FastEthernet0/0 D 172.16.2.0 [90/284160] via 10.10.10.2, 00:02:06, FastEthernet0/0 O 172.16.3.0 [110/11] via 10.10.10.2, 00:01:14, FastEthernet0/0 10.0.0.0/24 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 RT1# RT1#sh ip route summary IP routing table name is Default-IP-Routing-Table(0) Route Source Networks Subnets Overhead Memory (bytes) connected 0 1 64 152 static 0 0 0 0 eigrp 100 0 1 64 152 ospf 100 0 1 64 152 Intra-area: 1 Inter-area: 0 External-1: 0 External-2: 0 NSSA External-1: 0 NSSA External-2: 0 rip 0 1 64 152 internal 2 2344 Total 2 4 256 2952 RT1#
Below shows the impact of clearing the RIPv2 route – 172.16.1.0/24. Packet drops were observed.
RT1#debug ip rip RIP protocol debugging is on RT1# RT1#debug ip routing IP routing debugging is on RT1# RT1#sh ip route Gateway of last resort is not set 172.16.0.0/24 is subnetted, 3 subnets R 172.16.1.0 [120/1] via 10.10.10.2, 00:00:02, FastEthernet0/0 D 172.16.2.0 [90/284160] via 10.10.10.2, 00:02:51, FastEthernet0/0 O 172.16.3.0 [110/11] via 10.10.10.2, 00:01:59, FastEthernet0/0 10.0.0.0/24 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 RT1# RT1#sh ip rip database 10.0.0.0/8 auto-summary 10.10.10.0/24 directly connected, FastEthernet0/0 172.16.0.0/16 auto-summary 172.16.1.0/24 [1] via 10.10.10.2, 00:00:03, FastEthernet0/0 RT1# RT1#clear ip route 172.16.1.0 255.255.255.0 RT1# RT1#sh ip route Gateway of last resort is not set 172.16.0.0/24 is subnetted, 2 subnets D 172.16.2.0 [90/284160] via 10.10.10.2, 00:03:00, FastEthernet0/0 O 172.16.3.0 [110/11] via 10.10.10.2, 00:02:08, FastEthernet0/0 10.0.0.0/24 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 RT1# RT1#sh ip rip database 10.0.0.0/8 auto-summary 10.10.10.0/24 directly connected, FastEthernet0/0 172.16.0.0/16 auto-summary 172.16.1.0/24 [1] via 10.10.10.2, 00:00:12, FastEthernet0/0 RT1# 00:03:07: RT: del 172.16.1.0/24 via 10.10.10.2, rip metric [120/1] 00:03:07: RT: delete subnet route to 172.16.1.0/24 00:03:07: RT: NET-RED 172.16.1.0/24 00:03:24: RIP: received v2 update from 10.10.10.2 on FastEthernet0/0 00:03:24: 172.16.1.0/24 via 0.0.0.0 in 1 hops 00:03:24: RT: add 172.16.1.0/24 via 10.10.10.2, rip metric [120/1] 00:03:24: RT: NET-RED 172.16.1.0/24 00:03:24: 172.16.2.0/24 via 0.0.0.0 in 1 hops 00:03:24: 172.16.3.0/24 via 0.0.0.0 in 1 hops RT1# ====================================================================== RT2#ping 10.10.10.1 source 172.16.1.1 repeat 500 Type escape sequence to abort. Sending 500, 100-byte ICMP Echos to 10.10.10.1, timeout is 2 seconds: Packet sent with a source address of 172.16.1.1 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!.........!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!! Success rate is 98 percent (491/500), round-trip min/avg/max = 4/18/80 ms RT2#
Below shows the impact of clearing the EIGRP route – 172.16.2.0/24. No packet drop was observed.
RT1#debug ip eigrp IP-EIGRP Route Events debugging is on RT1# RT1#debug ip routing IP routing debugging is on RT1# RT1#sh ip route ====================================================================== RT2#ping 10.10.10.1 source 172.16.2.1 repeat 500 Type escape sequence to abort. Sending 500, 100-byte ICMP Echos to 10.10.10.1, timeout is 2 seconds: Packet sent with a source address of 172.16.2.1 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!! Success rate is 100 percent (500/500), round-trip min/avg/max = 4/17/72 ms RT2# Gateway of last resort is not set 172.16.0.0/24 is subnetted, 3 subnets R 172.16.1.0 [120/1] via 10.10.10.2, 00:00:24, FastEthernet0/0 D 172.16.2.0 [90/284160] via 10.10.10.2, 00:05:03, FastEthernet0/0 O 172.16.3.0 [110/11] via 10.10.10.2, 00:04:11, FastEthernet0/0 10.0.0.0/24 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 RT1# RT1#sh ip eigrp neighbors IP-EIGRP neighbors for process 100 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 10.10.10.2 Fa0/0 12 00:05:06 20 200 0 1 RT1# RT1#sh ip eigrp topology IP-EIGRP Topology Table for AS(100)/ID(10.10.10.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 10.10.10.0/24, 1 successors, FD is 28160 via Connected, FastEthernet0/0 P 172.16.2.0/24, 1 successors, FD is 284160 via 10.10.10.2 (284160/281600), FastEthernet0/0 RT1# RT1#clear ip route 172.16.2.0 255.255.255.0 RT1# RT1#sh ip route Gateway of last resort is not set 172.16.0.0/24 is subnetted, 3 subnets R 172.16.1.0 [120/1] via 10.10.10.2, 00:00:14, FastEthernet0/0 D 172.16.2.0 [90/284160] via 10.10.10.2, 00:00:00, FastEthernet0/0 O 172.16.3.0 [110/11] via 10.10.10.2, 00:04:28, FastEthernet0/0 10.0.0.0/24 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 RT1# 00:05:27: RT: del 172.16.2.0/24 via 10.10.10.2, eigrp metric [90/284160] 00:05:27: RT: delete subnet route to 172.16.2.0/24 00:05:27: RT: NET-RED 172.16.2.0/24 00:05:27: RT: add 172.16.2.0/24 via 10.10.10.2, eigrp metric [90/284160] 00:05:27: RT: NET-RED 172.16.2.0/24 RT1#
Below shows the impact of clearing the OSPF route – 172.16.3.0/24. No packet drop was observed.
RT1#debug ip ospf events OSPF events debugging is on RT1# RT1#debug ip routing IP routing debugging is on RT1# RT1#sh ip route Gateway of last resort is not set 172.16.0.0/24 is subnetted, 3 subnets R 172.16.1.0 [120/1] via 10.10.10.2, 00:00:05, FastEthernet0/0 D 172.16.2.0 [90/284160] via 10.10.10.2, 00:01:17, FastEthernet0/0 O 172.16.3.0 [110/11] via 10.10.10.2, 00:05:45, FastEthernet0/0 10.0.0.0/24 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 RT1# RT1#sh ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 172.16.3.1 1 FULL/DR 00:00:39 10.10.10.2 FastEthernet0/0 RT1# RT1#sh ip ospf database OSPF Router with ID (10.10.10.1) (Process ID 100) Router Link States (Area 0) Link ID ADV Router Age Seq# Checksum Link count 10.10.10.1 10.10.10.1 360 0x80000002 0x00FBB8 1 172.16.3.1 172.16.3.1 360 0x80000002 0x009105 2 Net Link States (Area 0) Link ID ADV Router Age Seq# Checksum 10.10.10.2 172.16.3.1 361 0x80000001 0x004A2F RT1# RT1#clear ip route 172.16.3.0 255.255.255.0 RT1# RT1#sh ip route Gateway of last resort is not set 172.16.0.0/24 is subnetted, 3 subnets R 172.16.1.0 [120/1] via 10.10.10.2, 00:00:19, FastEthernet0/0 D 172.16.2.0 [90/284160] via 10.10.10.2, 00:01:31, FastEthernet0/0 O 172.16.3.0 [110/11] via 10.10.10.2, 00:00:00, FastEthernet0/0 10.0.0.0/24 is subnetted, 1 subnets C 10.10.10.0 is directly connected, FastEthernet0/0 RT1# 00:06:58: RT: del 172.16.3.0/24 via 10.10.10.2, ospf metric [110/11] 00:06:58: RT: delete subnet route to 172.16.3.0/24 00:06:58: RT: NET-RED 172.16.3.0/24 00:06:59: RT: add 172.16.3.0/24 via 10.10.10.2, ospf metric [110/11] 00:06:59: RT: NET-RED 172.16.3.0/24 RT1# RT1#sh ip ospf database OSPF Router with ID (10.10.10.1) (Process ID 100) Router Link States (Area 0) Link ID ADV Router Age Seq# Checksum Link count 10.10.10.1 10.10.10.1 380 0x80000002 0x00FBB8 1 172.16.3.1 172.16.3.1 380 0x80000002 0x009105 2 Net Link States (Area 0) Link ID ADV Router Age Seq# Checksum 10.10.10.2 172.16.3.1 381 0x80000001 0x004A2F RT1# ====================================================================== RT2#ping 10.10.10.1 source 172.16.3.1 repeat 500 Type escape sequence to abort. Sending 500, 100-byte ICMP Echos to 10.10.10.1, timeout is 2 seconds: Packet sent with a source address of 172.16.3.1 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!! Success rate is 100 percent (500/500), round-trip min/avg/max = 4/20/76 ms RT2#
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