FreeBSD 11.1 OSPF multicast broken?

[Aragon Gouveia]

Good day,

There seems to be a multicast related bug with FreeBSD 11.1 and Bird 
1.6.3.  In summary:


Two problems:
* Ethernet interfaces configured as "broadcast" do not emit any OSPF 
packets, as observed by tcpdump.
* Above interfaces receive OSPF packets from Linux neighbours (as seen 
by tcpdump), but Bird does not receive them (nothing logged in debug mode).


Two workarounds:
* Enabling "real broadcast" solves both problems above, but it must be 
enabled on all peers' configs so that everyone broadcasts.

* Configuring interfaces as nbma on all peers also solves both problems.

While Bird is running, there seem to be no OSPF multicast memberships 
reported by ifmcstat(8), eg.


# ifmcstat -i vtnet1 -v
vtnet1:
inet 192.168.102.16
igmpv3 rv 2 qi 125 qri 10 uri 3
group 224.0.0.1 mode exclude
mcast-macaddr 01:00:5e:00:00:01
link 52:54:00:85:d7:51
group 01:00:5e:00:00:01

I have also tried disabling firewalls, and have not seen any "Permission 
denied" socket errors logged by Bird in debug mode.


I'd be delighted to help test/find a fix with my lab setup, but for now 
I'm a bit lost for digging into code and kernel APIs, which is where I 
suspect the problem lies.


Any ideas where to start?


Thanks,
Aragon

Re: Bird redundant routers with same AS on same location and prefix delegation to lower router

[Andrew]

Hi.

You should configure R1 and R2 as route reflectors.


On 07.09.2017 14:17, Gelderman, Richard wrote:


I am trying to achieve a redundant routing setup with two routers with 
the same ASN who do prefix delegation to a lower router.


The setup is the following:

AS1000 ISP1    ISP2 AS2000

    |   |

    |       |

AS1    R1  R2 AS1

prefix /22     \   iBGP   /  prefix /22

   \    /

\  /

     \    /

  R3 AS65000

/  \

/    \

 net A      net B

prefix /24     prefix /24

Does anybody has experience with this kind of setup?

Regards,

Richard

Bird redundant routers with same AS on same location and prefix delegation to lower router

[Gelderman, Richard]

I am trying to achieve a redundant routing setup with two routers with the same 
ASN who do prefix delegation to a lower router.

The setup is the following:

   AS1000 ISP1ISP2 AS2000
   |   |
   |   |
   AS1R1  R2 AS1
prefix /22 \   iBGP   /  prefix /22
\/
 \  /
  \/
   R3 AS65000
   /  \
  /\
 net A  net B
 prefix /24 prefix /24


Does anybody has experience with this kind of setup?


Regards,

Richard