[j-nsp] EX4550 version

[Phil Bedard]

This is unrelated somewhat, but what are the current LAG member limits
as well as ECMP limits? Any restrictions on LAG+ECMP?

phil From: Sam
Sent: 7/24/2013 8:46
To: Bouzemarene, Farid (ATS)
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] EX4550 version
Hi Farid,

>From an old case I had open with Juniper:

>The EX4550 has an ARP table of maximum 8k entries.
> These entries are tracked in the kernel through something called tokens.
> Each ARP entry is a token.
>
> Because we have only 8k tokens available, from here we have the maximum number of ARP entries.
>
> However, because of how the chipset of EX4550 is designed, the MPLS LSPs are also making use of the same tokens.
> But each MPLS LSP is using 8 tokens. Therefore, 1000 LSPs would use all tokens and no ARP can be learned.
>
> The token usage is scaled up by the number of ECMP next-hops. So 1 LSP with 4 ECMP next-hops will take 1*8*4=32 tokens.

--
sam


On 24 Jul 2013, at 11:28, "Bouzemarene, Farid (ATS)"
<Farid.Bouzemarene at avnet.com> wrote:

> Hello,
>
> Can you clarify the MPLS limits ?
>
> Thx
>
> ----- Message d'origine -----
> De : Sam [mailto:sam-ml at arahant.net]
> Envoyé : Wednesday, July 24, 2013 10:39 AM
> À : Luca Salvatore <Luca at ninefold.com>
> Cc : juniper-nsp at puck.nether.net <juniper-nsp at puck.nether.net>
> Objet : Re: [j-nsp] EX4550 version
>
> I used the 12.3R2.5 for quite some time now without any issue. The platform has its limitations (especially related to how MPLS is handled), but if you're just using it for L2 or basic L3 it works just fine.
>
> --
> sam
>
> On 24 Jul 2013, at 03:27, Luca Salvatore <Luca at ninefold.com> wrote:
>
>> Hi All,
>>
>> Just got a couple of new EX4550 switches... current recommended version is 12.2r2.5
>> But I just saw tha the 12.2 train is up release 5.3.
>>
>> Just wondering what the rest of you guys are running  and if you have any horror stories.
>> I'm not doing VC with these guys, they are going to be a pretty simple layer 2 aggregation type switch.
>>
>> Thanks.
>>
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