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docmarius
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[Solved] OSPF bug for routes on multiple gateways to same IP

Mon Oct 06, 2014 8:11 am

I think there is route handling for OSPF in recent, at least 6.19/6.20 ROS versions.
Scenario: 1 RB1100AHx2, 1 RB951, both running 6.20, each connected to different ISPs (PPPoE and respective DHCP).
2 Tunnels between them (servers run on the RB1100):
- pptp (192.168.73.101 on rb1100 - same as on LAN, 192.168.76.1 on rb951, same as on LAN)
- sstp (192.168.73.101 on rb1100 - same as on LAN, 192.168.99.2 on rb951 - backup link)
This effectively gives me 2 gateways to 192.168.73.101, one via ppp, one via sstp.
OSPF set up to work on pptp interfaces on rb1100, on rb951 network set to 192.168.73.0/24 and 192.168.76.0/24

The issue is I got OSPF packets and proper routes in the ospf route list via pptp, but routes are installed to main table via sstp (see attached picture).
As information pptp interface shows 1 neighbor, sstp none, so LSA info is correct.
Checking from the RB1100, traffic to 192.168.76.1 will go via pptp and response is returned via sstp.

Opened Ticket#2014100566000091.
OSPF_6.20.png
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Last edited by docmarius on Mon Oct 06, 2014 10:09 pm, edited 1 time in total.
Torturing CCR1009-7G-1C-1S+, RB450G, RB750GL, RB951G-2HnD, RB960PGS, RB260GSP, OmniTIK 5HnD and NetMetal 922UAGS-5HPacD + R11e-5HnD in my home network.
 
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docmarius
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Re: OSPF: bug for routes on multiple gateways to same IP

Mon Oct 06, 2014 9:53 pm

Very fast response to ticket. This was classified as a minor bug and will be solved in ROS 7.

Temporary workaround in my case: Use another peer IP for the tunnel so there are no multiple gateway interfaces to the same IP.
OSPF_workaround.png
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Torturing CCR1009-7G-1C-1S+, RB450G, RB750GL, RB951G-2HnD, RB960PGS, RB260GSP, OmniTIK 5HnD and NetMetal 922UAGS-5HPacD + R11e-5HnD in my home network.

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