[j-nsp] SRX cluster across L2 vlan issue

[Raphael Mazelier]

While it was not really advisable to run fabric link over a stack of 
switches, (and not to have cluster stretched over datacenter) I have 
setup many srx cluster in a similar way.

Two points to check :
- obviously a separate single vlan by fabric link (untag on the srx 
side, even if it may work tagged).
- jumbo frame (at least 9000), because fabric link use special frame 
(and long one). If the mtu remains at 1500, strange thing may happen.
- no stp/whatever on the ports


Regards,

--
Raphael Mazelier.


Le 13/01/16 17:04, james list a écrit :
> Hi experts,
>
>
> a customer of mine has implemented an SRX cluster HE(1400) over a L2 (vlan)
> infrastructure and is having sometime problems on the dual FAB links, which
> trigger basically a split brain.
>
>
> The cluster is geographically stretched and in one site the customer has
> Cisco Nexus 5k and on the other has Extreme switches.
>
>
> I’m not having a lot of info by the customer, I can only see that they have
> configured PVSTP on Cisco side and no STP protocol on Extreme side.
>
>
> Has anyone experienced problems in these kind of scenario ?
>
>
> I’m aware of the Juniper prerequisites stated here:
>
> http://kb.juniper.net/library/CUSTOMERSERVICE/GLOBAL_JTAC/NT21/LAHAAppNotev4.pdf
>
>
> I’m looking for real experience and comments, what to check, any help, etc.
>
>
> Cheers,
>
> James
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