Hello!
I have implemented the ospf transit fabric in my network following a post and recommendation from IP Architects. This was a great fix for having unequal links between towers, and to use OSPF with ECMP to load balance across the two or three backhauls in-between our towers and fiber uplinks. This has been working great for some time, but as outlined in this post viewtopic.php?t=156630&sid=590cadabff66 ... 66563fe625 we have had some of these similar issues.
This seems to only effect our mikrotik routers with OSPF and BGP enabled (CCR 1036 and RB4011), and when we shut off a vlan with OSPF running ( for example a 60ghz radio goes off in rain, or we manually shut down the VLAN interface for doing work) it causes that router to shut its OSPF and BGP processes, looses all neighbors and has to reconnect them. During that time, i completely loose access to the router if it is remote.
We are currently running more than 63 vlans with OSPF in-between 13 routers. Our core route reflector is a dell s4048on which does not have a problem when OSPF goes up or down within the network. I have seen this issue happen with most of the mikrotik routers on the network, if i enable or disable a vlan that has OSPF on it, usually that device will drop all OSPF and BGP connections.
I am in the process of upping the L2 MTU to maximum on all switches and routers as suggested in the previous post, however i am curious if there has been any fixes for this in newer firmware? We are running long term releases on ours, 6.47.9 (CCR1036) , 6.48.6, 6.48.2, 6.48.3 (RB4011). I was also thinking of disabling connection tracking as well if that was a fix that would resolve this issue as we do not use NAT so i do not believe it would be an issue unless it is necessary for ECMP?
As discussed in the previous post I was also seeing the same logs of "discarding packet : locally sourced" as well as " Received update of self-originated LSA" Which made me think there was a loop somewhere for quite some time.
Also curious is anyone else is using this transit fabric with a larger network to see if there is any scalability issues i might want to consider.
thank you
I have implemented the ospf transit fabric in my network following a post and recommendation from IP Architects. This was a great fix for having unequal links between towers, and to use OSPF with ECMP to load balance across the two or three backhauls in-between our towers and fiber uplinks. This has been working great for some time, but as outlined in this post viewtopic.php?t=156630&sid=590cadabff66 ... 66563fe625 we have had some of these similar issues.
This seems to only effect our mikrotik routers with OSPF and BGP enabled (CCR 1036 and RB4011), and when we shut off a vlan with OSPF running ( for example a 60ghz radio goes off in rain, or we manually shut down the VLAN interface for doing work) it causes that router to shut its OSPF and BGP processes, looses all neighbors and has to reconnect them. During that time, i completely loose access to the router if it is remote.
We are currently running more than 63 vlans with OSPF in-between 13 routers. Our core route reflector is a dell s4048on which does not have a problem when OSPF goes up or down within the network. I have seen this issue happen with most of the mikrotik routers on the network, if i enable or disable a vlan that has OSPF on it, usually that device will drop all OSPF and BGP connections.
I am in the process of upping the L2 MTU to maximum on all switches and routers as suggested in the previous post, however i am curious if there has been any fixes for this in newer firmware? We are running long term releases on ours, 6.47.9 (CCR1036) , 6.48.6, 6.48.2, 6.48.3 (RB4011). I was also thinking of disabling connection tracking as well if that was a fix that would resolve this issue as we do not use NAT so i do not believe it would be an issue unless it is necessary for ECMP?
As discussed in the previous post I was also seeing the same logs of "discarding packet : locally sourced" as well as " Received update of self-originated LSA" Which made me think there was a loop somewhere for quite some time.
Also curious is anyone else is using this transit fabric with a larger network to see if there is any scalability issues i might want to consider.
thank you
Statistics: Posted by errrk — Thu Jan 25, 2024 2:18 am