[j-nsp] EX4550 apparently dropping IPv6 RA

[Benoit Plessis]

Hi,

It won't help you i fear but i did see exactly the same defect on some
other concurrent platform (cisco 3560G).

With the latest IOS software (15.x) a 3560G unit in L3 mode does
correctly send RA and reply to RS, but the same
unit in L2 mode between a router and a server fail to deliver RA/RS
messages ...
"Normal" IPv6 trafic correctly flow thru the 3560G in L2 however.

Downgrading the L2 unit to a 12.xx release did solve the problem, and
also did replacing the 3560G
by a 2960G even in IOS 15.

Looks like some packet handling code isn't correctly de-activated.


Le 16/06/2014 07:23, John Neiberger a écrit :
> This does seem to be specific to RA/RS. I haven't been involved in
> troubleshooting over the weekend but the updates I read said that they took
> some packet captures of RA messages from the Cisco 7600 that the switch
> used to be connected to and compared them with captures taken from the
> MX960. They found some differences and adjusted to the configuration to
> make them the same, but that still did not resolve the problem. The issue
> has been escalated with Juniper. Last I read, no one really has any idea
> yet what is going on. They've got an action plan for tomorrow, so I'll know
> more after a meeting in the morning. Sure seems awfully funky, though. JTAC
> seems to be at a loss to explain what is happening.
>
> Thanks,
> John
>
>
> On Sun, Jun 15, 2014 at 5:22 AM, Phil Mayers <p.mayers at imperial.ac.uk>
> wrote:
>
>> On 14/06/14 22:24, John Neiberger wrote:
>>
>>  The EX4550 is just layer two. There is no routing configured on it, so it
>>> should just be passing the RAs from the router to the hosts on the second
>>> switch, but that doesn't seem to be happening.
>>>
>> Is it RA/RS specific, or is forwarding to fe80::1 and related groups
>> broken?
>>
>>
>>  Have any of you ever seen anything quite like this?
>> On other platforms, I've seen IPv6 link-local multicast fail to flow as
>> some tiny table, sized with IPv4 assumptions, overflowed.
>>
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