BGP and OSPF mikrotik problems

RouterOS General
1

Hello,

I want to complain and exchange experiences about Mikrotik BGP and OSPF support - I am struggling with them for quite some time.
Fistly - OSPF support with is very unstable, what was also mentioned in several posts. In ROS 2.9.42, for example. my OSPF routes are dissapearing after some time without any reason ! I reported this to support twice and I got two different responses - first was that I shall stay with 2.9.37 and wait for v3 becouse OSPF is buggy, second that I may use 2.9.42 becouse there are no bugs and problems with OSPF. Funny, isn’t it ? I must use 2.9.37 and for example my BGP may suffer becouse of this.

Secondly - BGP. It seems to work better that OSPF (at least no breaking sessions one hour after end of work, when you are drinking a beer with your pals and thiking far away from BGP :wink: but I have problem with internal BGP. I can’t force advertised routes to prepend my AS x times.
Routes are summerized and I make Cisco-like loopback trick mentioned on http://wiki.mikrotik.com:3280/wiki/Routing_Questions - everything ok but filter with prepend seemed not working at all.
Here are my filters :

0 chain=bgp_crowley_out prefix=193.21.34.0/24 prefix-length=24
invert-match=no action=accept set-bgp-prepend=4 set-bgp-med=15

1 chain=bgp_crowley_out prefix=193.41.162.0/23 prefix-length=23
invert-match=no action=accept set-bgp-prepend=4 set-bgp-med=15

2 chain=bgp_crowley_out invert-match=no action=reject

Chain bpg_crowley is set as an out filter of my BGP peer. I have a 193.21.34.254/24 and 193.41.163.254/23 addresses assigned to my “loopback” bridge. Maybe I am doing something wrong ? I don’t have anything in “/routing bgp network”. Please help.

Regards,
Nick

2

I use ospf with routing test and have no problems (most of the time)

I have about 40 routers in the ospf area.

Its very rare I would need to touch it, perhaps once a month reboot something.

I am sorry I can’y help further, just relaying my experiances

3

Equis

could you tell me your mailbox address

I want to ask some OSPF question to you

4

I suppose so, but sometimes its better on a forum so all can learn and benifit :slight_smile:

rhys at dezigner dot com dot au

5

Equis which ROS version are you using ? I have 12 routers in OSPF backbone, it is working quite ok but not in 2.9.42

6

2.9.42 :slight_smile: always the latest with me. (or one behind)

Are you using routing test?

Are you wireless links stable?

7

Your’e a lucky one :smiley: .

I’ve still 2 routers which do not speak OSPF on a
interface (even reboot does not help) and waiting to get it fixed.

This problem came after this routers worked for several weeks
in the mid of a night.
So tomorrow night might be your night :wink:

Stefan

8

Thats a worry

9

make sure to use routing-test package and not the regular one

10

sure!

11

I have trouble with OSPF too. Only a few a router sometimes have this route disappering trouble. We have about 100 hundred MT box which use OSPF and there is a lot PPPOE concentrator too. We saw this trouble mostly on the evening hours (when the traffic is high). The area range helped a lot (thanks to MT Support for the help), but still have trouble. I sent a lot of supout file to MT.

We use MT BGP too. It works very fine for us.

We use every router the latest 2.9.42 version and routing-test.

12

Dagmik

try

2 chain=bgp_crowley_out prefix=(your network) invert-match=yes action=discard

Jean

13

In my case I noticed that only one router has disappering routes problem but it is core router so that has impact on whole network. I also sent supout files but without results for now.

Hmm, you imply that size of area may cause this disappering routes problem?

BTW I, of course, use routing-test package

14

It is Ok, but I have more that one prefix to advertise.
My problem is that I can’t make BGP prepend working - my filters seems to be OK here. Interesting fact may be, that when my networks are added to “loopback” bridge interface, filter with prepend is not working, but when this networks are learned from another IBGP peer and not added to “loopback” everything is ok.

15

My problems are still there in 2.9.43.

Stefan

16

OK, I got reponse from mikrotik support to my BGP prepend problem :

ahh just like I expected :wink: I hope that 2.9.44 will be released soon.

I will also test ROS 2.9.43 agaist dissapearing OSPF routes but I have bad feelings about this.

17

So I’ve found the problem. This was a problem with the nonmanaged
switch the RBs where connected to. It works but blocks some traffic.

So no problem of RB or ROS!

Sorry for this,
Stefan

18

I too have been having problems with 2.9.42 It seems to go and come at different times. I just up graded all to 2.9.43. My question is should I use the router-test package in 43 or the standard package?

19

routing-test works for me.

Stefan