Good afternoon ,
Can you please hep me to understand the portion of this lab.
I verify that R1 & R2 don’t have route 184.108.40.206 on their routing table once I applied router filtering out . I used this command area 3 filter-list prefix OUT-AREA3 out.
Question:? Why R4 is adding route 220.127.116.11 to it’s routing table and not filtering out that route, since the loopback interface 18.104.22.168 it’s on Area 0 .
R1 & R2 due to filtering can’t ping 22.214.171.124, cause is not on the routing table; which is fine , according to the purpose of the configuration.
R1#sh ip route 126.96.36.199 % Network not in table R1# R2#sh ip route 188.8.131.52 % Network not in table R4#sh ip route 184.108.40.206 Routing entry for 220.127.116.11/32 Known via "ospf 1", distance 110, metric 2, type intra area Last update from 192.168.34.3 on FastEthernet1/0, 01:53:04 ago Routing Descriptor Blocks: * 192.168.34.3, from 18.104.22.168, 01:53:04 ago, via FastEthernet1/0 Route metric is 2, traffic share count is 1
I sued extended ping to ping from lop 22.214.171.124 to ping 126.96.36.199 and it works, when it shuld be blocked.
R4#ping ip Target IP address: 188.8.131.52 Repeat count : Datagram size : Timeout in seconds : Extended commands [n]: y Source address or interface: 184.108.40.206 Type of service : Set DF bit in IP header? [no]: Validate reply data? [no]: Data pattern [0xABCD]: Loose, Strict, Record, Timestamp, Verbose[none]: Sweep range of sizes [n]: Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 220.127.116.11, timeout is 2 seconds: Packet sent with a source address of 18.104.22.168 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 4/16/40 ms
Outbound Area LSA Type 3 filtering
R1 and R2 both know about the loopback interface of R3. Let’s create a prefix-list that matches 22.214.171.124 /32:
*************CURRENT CONFIGURATION ON R4 ************************************
R4#show ip prefix-list OUT-AREA3 ip prefix-list OUT-AREA3: 2 entries seq 5 deny 126.96.36.199/32 seq 10 permit 0.0.0.0/0 le 32 R4#show ip prefix-list INTO-AREA3 ip prefix-list INTO-AREA3: 4 entries seq 5 deny 188.8.131.52/32 seq 6 deny 192.168.14.0/24 seq 7 deny 192.168.24.0/24 seq 10 permit 0.0.0.0/0 le 32 R4#sh run | s router router ospf 1 area 3 filter-list prefix INTO-AREA3 in area 3 filter-list prefix OUT-AREA3 out network 184.108.40.206 0.0.0.0 area 0 network 192.168.14.0 0.0.0.255 area 1 network 192.168.24.0 0.0.0.255 area 2 network 192.168.34.0 0.0.0.255 area 3 R4#