OSPF is loosing routes

RouterOS General
1

Hi all,

we have something like ~50 nodes with OSPF, and at the moment no other area than the backbone. What we see is that on some random period we loose most of the OSPF routes. This is quite annoying because the customer see the interruption of the service.

We are using 2.9.35 and 2.9.39 on most of the nodes, and routing-test for the OSPF.

The question is:

  1. should we upgrade the whole network to the same routeros version?
  2. did mikrotik fix bugs in the router-test package in the last packages?

Any hint is greatly appreciated.

Thank you

2

answers

  1. Probably
  2. yes! I think that I was getting a memory leak from the routing_test package before 2.9.41
3

and the problem was in the ospf daemon?

Thank you

4

Hi,

Upgrade to 2.9.42. We had the same trouble with versions before 2.9.41. The new version is much stable then 2.9.35-39.

Krisz

5

Is the OSPF running on wireless links or ethernet? Try setting the network type in the OSPF inerface settings to something other than broadcast. Here are the explanations for the different networks types :

*broadcast - packet that is sent to broadcast network will be received by
all
routers in subnet. Example of broadcast network is Ethernet or Token Ring.

Others are non-broadcast networks, packet can be sent only to one router
at
the time.

  • NBMA - all routers in network can communicate to each other directly,
    but
    there are no broadcast capability. NMBA is very similar to
    Point-to-Multipoint
    network (ptmp), but not as stable. Some of network routers Priority should
    be
    set to 0, so that router becomes Designated Router to reduce Hello packet
    flooding over the network.

  • ptmp - the same as NBMA, but drops the requirement that all routers be
    able
    to communicate directly. It takes time to calculate neighbors, because
    there
    are no broadcast capability and possibility that router can not be
    directly
    reached, but it is more stable than NBMA.

  • point to pint - this is point to pint connection, for example some kind
    of
    tunnel.

NBMA and ptmp are more preferred in wireless networks.

Hope this helps…

6

Why?

–Tom

7

Yes, why? I have troubles too with mikrotik ospf (2.9.37).
What ospf detecting neighbours method have to do with ospf stability?

8

we upgraded to 2.9.42 and it works much better. At least we do not loose the routes…

9

Yes you should upgrade to latest version, and it is preferred that all routers has the same version.

leonj:
ROS will detect network type automatically ( at least it will try to do :slight_smile: ). There is no need to set network type on each interface running OSPF unless you need specific network type.

10

but i would select PtP-interface type whenever possible, cause it saves the router from the whole DR-/BDR-selection work.