I've got a very weird situation that has come up lately. Wondering if
anyone has any ideas. I've got two connections out to the Internet
that enter my network in two different locations. Upstream ISP is the
same on both connections. We run BGP with them via two Cisco edge
routers. They send us a default route, which I'm injecting into OSPF
at both locations.
Now here's the weird part. If I lose BGP for connection A, every
Mikrotik V4 or V5 box in my network loses its default route
completely. In contrast, all my V3 or V2.9 (yes, I still have some of
those) routers install the new default route in the routing table, and
off they go without so much as a blink. If I do a 'routing ospf lsa
print', the LSA for the new default is there. But it never gets
installed in the routing table. In order to get these V4 and V5
routers to pick up the default, all I have to do is make a change to
OSPF somewhere on the network. I can make that change anywhere on the
network. It doesn't have to be on one of the V4 or V5 routers. Any
simple change will suddenly make these routers pick up the new default.
To make it even stranger, this problem doesn't happen in reverse. If
I lose BGP for connection B, the default route for connection A
propagates to all routers in the network and everything is fine.
I've been googling on this and found a few similar posts on the MT
forum, but nothing where MT has ever acknowledged that it's a bug. It
sure looks like one to me though, since it only affects V4 and V5
routers. I have a difficult time believing that such a bug could
exist through an entire release's life cycle and well into the next
without being fixed.
Does anyone have any insight on this?
Craig
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