Chrys Bryan says
"The passive interface concept is clear enough with RIP, IGRP, and EIGRP – all protocols that send routing update packets. But OSPF doesn’t send routing update packets – OSPF sends link state advertisements.
It’s the inability of the passive interface command to stop LSAs that lead many to think that passive interfaces cannot be used with OSPF."
A lab i did prove that LSAs are stoped anyways ill post it so tell me what you think? maybe im not looking in the correct place so somoene come and point me where i should look?
Check it out
This is what i got
R1----R2
R3
R1 in area 0
R2 ABR
R3 in area 1
R1-R2 network 192.168.1.0
R2-R3 network 192.168.2.0
Turned on debug ip ospf flood on R2
This was BEFORE the passive interface
Sending updates through interface S1/0
*May 4 01:13:53.831: OSPF: Sending update on Serial1/0 to 192.168.1.1 Area 0
*May 4 01:13:53.835: OSPF: Send Type 1, LSID 192.168.2.1, Adv rtr 192.168.2.1,
age 5, seq 0x80000002 (0)
*May 4 01:13:53.835: OSPF: Send Type 3, LSID 192.168.2.0, Adv rtr 192.168.2.1,
age 2, seq 0x80000001 (1)
Sending updates through interface S2/0
*May 4 01:14:00.251: OSPF: Sending update on Serial2/0 to 192.168.2.2 Area 1
*May 4 01:14:00.251: OSPF: Send Type 1, LSID 192.168.2.1, Adv rtr 192.168.2.1,
age 13, seq 0x80000001 (0)
*May 4 01:14:00.255: OSPF: Send Type 3, LSID 192.168.1.0, Adv rtr 192.168.2.1,
Okay now with Passive interface ON just on S1/0
Something werid when i found activated the passive intercae
R2(config-router)#passive-interface s1/0
R2(config-router)#
*May 4 01:23:44.419: OSPF: Build router LSA for area 0, router ID 192.168.2.1,
seq 0x80000001
Why is building that LSA when i active passive interface???
Anyways here is the output when i turned ON the passive interface on s1/0 that goes to area 0
sending update on serial 0
*May 4 01:30:00.231: OSPF: Sending update on Serial2/0 to 192.168.2.2 Area 1
*May 4 01:30:00.235: OSPF: Send Type 1, LSID 192.168.2.1, Adv rtr 192.168.2.1,
age 9, seq 0x80000001 (0)
*May 4 01:30:00.235: OSPF: Send Type 3, LSID 192.168.1.0, Adv rtr 192.168.2.1,
age 10, seq 0x80000001 (1)
Looked carefully 3 times and couldnt find the updates going through Serial 1/0(LSA type 1 and 3 going thought s1/0) this time and the part of send TYPE1 or TYPE 3 over that serial 1/0 (i could have pasted all the output but was long... and i dont think you would want to search on it)
All i could find was this
*May 4 01:29:52.671: OSPF: Build router LSA for area 0, router ID 192.168.2.1,
seq 0x80000003
To test this i was shutting down the interfaces s1/0 and s2/0 in R2 and resetting the process so they had nothing in the ospf database...
