[j-nsp] IPv6 VRRP packets dropped?

John Neiberger jneiberger at gmail.com
Wed Aug 28 16:56:13 EDT 2013

We ran into something very similar a long time ago. I don't remember the
resolution, but I think we either reloaded the linecard or replaced the
linecard. Nothing else we tried fixed it. I seem to recall we tried
restarting the VRRP process but it didn't help. That was over a year ago,
at least. My memory is a little fuzzy.


On Wed, Aug 28, 2013 at 8:05 AM, Sebastian Wiesinger <
juniper-nsp at ml.karotte.org> wrote:

> Hello,
> I have two MX routers with a VPLS instance. The instance has an irb
> interface on both routers with IPv6 VRRP configured on it.
> On the backup router I see the VRRP mastership flap every few seconds.
> When I look at VRRP statistics I see that it receives much less
> packets than the other router sends.
> Primary VRRP Router:
>   Group VRRP PDU statistics
>     Advertisement sent                       :11105
>     Advertisement received                   :1394
> Backup VRRP Router:
>   Group VRRP PDU statistics
>     Advertisement sent                       :2067
>     Advertisement received                   :4185
> The interval is set to 1 second. When I monitor traffic on the irb I
> can see that packets are missing. The primary router sends it but the
> irb on the backup router does not receive it.
> I don't have any policers that would discard "some" of the packets. I
> also disabled uRPF and the lo filters to be sure but still the VRRP
> flaps.
> Has anyone seen anything like that or has any idea where to look
> further?
> This is on MX960 routers with JunOS 11.4 and Trio MPCs.
> Regards
> Sebastian
> --
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