[j-nsp] ERX 310 GE-HDE limitation ?

[Rafał Szarecki]

Hi,

GE HDE connectivity to switch-fabric alows for 2Gbps from fabric to user,
PLUS 2Gbps from User (interface) to Fabric. The kimitation is because HDE
has 8 ports. So this 8 ports are oversubscribed. BTW You can use 2-port IOA,
then bothe GE are true wirespeed.

So, in other words 310 w/ HDE LM alows You 2Gbps network->user plus 2Gbps
user-> network. If we talk about IPv4, this is achivable for any packet size
above 64B (what is mimimal legal pacet size for GE).

Above is for u-cast packets and PPPoE sessions.
For M-cast encapsulated as IP over Eth, 8-port HDE can replicate m-cast
packets recived form Line Module to multiple ports. So, it is possible to
send out from HDE 8Gbps of M-cast (sale packet out of multiple ports).

2007/4/17, Alexandre Snarskii <snar at paranoia.ru>:
>
>
> Hi!
>
> Yesterday I started to read documentation on ERX-310, because
> we need something more scalable than our existing c7301's
> for PPPoE termination.
>
> While 310's looks really promising, there is one interesting
> limitation I need to understand..
>                                                                                 Documentation
> says, that "The overall data rate for the GE-HDE line             module is
> 2 Gbps;" and provides some cases on how will that load be
> distributed over equally-loaded ports in GE-8 I/O module.
> But, in our setup traffic flows are distributed at about 80/20 rule,
> 80% traffic is network -> users, and only 20% users->network.
>
> Question is: do I understand it correct, that with our traffic patterns
> we can be able to achieve something about 1.6 Gbit network->users and
> 0.4 Gbit users->network ? (Average packet size is well over 174 byte).
>
> And, if anyone using this hardware in the production and like to
> share his experience - I'd like to hear your opinions/real-world numbers..
>
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-- 
Rafał Szarecki JNCIE-M/T, JNCIP-E
+48602418971