[j-nsp] J series users bitten by the massive memory use increase with flow mode add, please file jtac cases.

[Pavel Lunin]

> Example: you run routed metro (or datacenter) ethernet ring, with less
> than 12k entries in FIB. One of your customers wants to turn BGP on his
> link. There are lots of choices on how to do that:
> [...]
> But that is one of cases when having full-view in your edge switch RIB
> and redistributed to customer fits perfectly.
>    
Ok. But let's be honest, it's tricky. Specially in L3 metro access where 
it is easy to get a loop if you don't rely on what customers announce to 
you (I had experience of spending weeks on phone with major Russian ISP 
on behalf of the customer, who wanted split AS to work with no loops). I 
believe there are some other examples of RIBs not used for forwarding, 
but normally this is very different case than we talked about and you 
know what you use it for. And you anyway have something which uses full 
table for forwarding.  What you call 'routed metro' is itself a little 
bit of a question to discuss how it works :) But, please, let's not 
continue this. It' s too far away from the topic.

> IIRC, it's quite possible to use closest MX-series router to mix
> draft-kompella pseudowire from EX-series into VPLS domain (it was
> discussed in this list not so long time ago).
> Not sure about L3VPN though.
>    
Yeah! You can even have large VC ring of EX4200 and run VLANs instead of 
PWE3. Or some other magic L2 technology like PBB, STP or layer 1 
circuits if you like. But you anyway use switches just as transport 
between customers and service point (MX). It is quite a different story 
than putting cheap routers everywhere and run VPLS/L3VPN on them.

This is what I am speaking about. If you want a cheap network — put 
switches everywhere and run some L2 transport till service points (MX), 
where you put the circuits into instances. If you are brave enough to 
run L3VPN/VPLS everywhere, use MX everywhere. Ok, J series as an 
exception for small remote locations. But if you just put switches or 
even J series everywhere, than be ready to spend nights at work and 
don't say this is the vendor who makes you non-competitive :)

--
Kind regards,
Pavel