I have some ospf problem, the attachment is network diagram :
1. SW1 is in area 0 2. SW3 & SW4 are ABR ( area 0 & area 1 ) 3. SW1 have connected network 10.1.1.0/24, 10.1.2.0/24, 10.1.3.0/24 4. SW2 is new switch, it also configure as area 0. it have connected network 10.1.4.0/24, 10.1.5.0/24, 10.1.6.0/24 5. SW3 & SW4 have connected network 10.2.1.0/24, 10.2.2.0/24, 10.2.3.0/24 6. SW1, SW2, SW3, SW4 have redistribute connected and static route into OSPF
While the link between SW4 & SW2 connect ( SW1 & SW2 still disconnect ), it cause hosts connect at SW1 ( 10.1.1.0/24, 10.1.2.0/24, 10.1.3.0/24 ) can not access to SW4 loopback IP address. Please tell me the reason why this problem occur?
Is the SW1 not able to access SW4 loopback (10.2.254.2) only when SW2 is connected ? If SW2 connection is removed, they are able to ping 10.2.254.2 ? Can you paste the show ip route 10.1.1.1 from SW 4 , and show ip route 10.2.254.2 from SW1 ? Is the link between SW3 & SW4 layer 2 ?
The SW3 & SW4 is connected by 802.1q trunk port, but I have configure Layer 3 SVI at both SW3 & SW4 and enable OSPF routing at this L3 SVI.
I know this diagram have some problem, the area 0 is partitioned. I think the problem would not occur if I connect SW1 & SW2 first. Would you please tell me more detail why SW1 can not access to SW4 loopback IP?
I would take Giuseppe's second recommendation: Connect SW1 ro SW 2 and SW3 to SW4 with routed connections in Area 0.
Also, youve answered your own question regarding why SW1 cannot access the Lo0 address of SW4. The Area is split and there is no way for Sw4 to advertise its Lo0 address to anyone else on the network - there is no OSPF neighborship between SW4 and anyone else to be able to advertise that isolated subnet.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
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