Question about EX - SRX redundancy

Thu Apr 2 15:17:03 UTC 2015

Hi

I thought cross chassis lag is supposed by the use of reth bundled at SRX
end. I read this is basically the major difference in reth Vs ae bundle in
SRX.

Interesting factor here is that ae bundles can spread across multiple EX
chassis in a virtual chassis environment but this cannot be the case with
ae bundles in SRX.

Thanks.

On Thu, Apr 2, 2015 at 7:59 PM, Bill Blackford <bblackford at gmail.com> wrote:

> It's my understanding that a cross chassis LAG is not supported. If there
> is a way, I'm not aware of it. I'm running the same set up as your working
> example in my locations and for now, this suits my requirements.
>
> Sent from my iPhone
>
> > On Apr 2, 2015, at 07:12, Anurag Bhatia <me at anuragbhatia.com> wrote:
> >
> > Hello everyone!
> >
> >
> >
> >
> > I have got two Juniper EX series switches (on virtual chassis) and two
> SRX
> > devices on native clustering.
> >
> >
> > I am trying to have a highly available redundancy between them with
> atleast
> > 2Gbps capacity all the time but kind of failing. I followed Juniper's
> > official page here
> > <http://kb.juniper.net/InfoCenter/index?page=content&id=KB22474> as
> well as
> > this detailed forum link here
> > <
> http://forums.juniper.net/t5/SRX-Services-Gateway/Best-way-of-redundancy-between-SRX-and-EX/td-p/181365
> >
> > .
> >
> >
> > I wish to have a case where devices are connected criss cross and
> following
> > the documentation I get two ae bundles in EX side and one single reth
> > bundle on SRX side. Both ae bundles on EX side have identical
> configuration
> > and VLAN has both ae interfaces called up.
> >
> >
> > If I do not go for criss cross connectivity like this:
> >
> >
> >
> > EX0  (ae1) >> Two Patches to SRX0 (reth1)
> > EX1   (ae2)  >> Two Patches to SRX1 (reth1)
> >
> >
> > Then it works all well and redundancy works fine. In this case as long
> as 1
> > out of 4 patch is connected connectivity stays live but this has trade
> off
> > that if one EX goes down then I cannot make use of other corresponding
> SRX.
> >
> > If I do criss connectivity, something like:
> >
> >
> > EX0 (ae1) >> Two Patches to SRX0 (reth1)
> > EX0 (ae1) >> One patch to SRX1 (reth1)
> >
> > EX1 (ae2)  >> Two Patches to SRX1 (reth1)
> > EX1 (ae2)  >> One patch to SRX0 (reth1)
> >
> >
> > In this config system behaves very oddly with one ae pair (and it's
> > corresponding physical ports) working well while failover to other ae
> > bundle fails completely.
> >
> >
> >
> > I was wondering if someone can point me out here.
> >
> >
> >
> >
> > Appreciate your time and help!
> >
> >
> >
> >
> >
> > --
> >
> >
> > Anurag Bhatia
> > anuragbhatia.com
> >
> > Linkedin <http://in.linkedin.com/in/anuragbhatia21> | Twitter
> > <https://twitter.com/anurag_bhatia>
> > Skype: anuragbhatia.com
> >
> > PGP Key Fingerprint: 3115 677D 2E94 B696 651B 870C C06D D524 245E 58E2
>

-- 

Anurag Bhatia
anuragbhatia.com

Linkedin <http://in.linkedin.com/in/anuragbhatia21> | Twitter
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Skype: anuragbhatia.com

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