[179181] in North American Network Operators' Group
Re: Question about EX - SRX redundancy
daemon@ATHENA.MIT.EDU (Bill Blackford)
Thu Apr 2 10:30:05 2015
X-Original-To: nanog@nanog.org
From: Bill Blackford <bblackford@gmail.com>
In-Reply-To: <CAJ0+aXaEha=g4D-nmPncyRc-D41CRpYv-cMwnzsPn=OPRQ+gmw@mail.gmail.com>
Date: Thu, 2 Apr 2015 07:29:30 -0700
To: Anurag Bhatia <me@anuragbhatia.com>
Cc: NANOG Mailing List <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
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 exa=
mple in my locations and for now, this suits my requirements.=20
Sent from my iPhone
> On Apr 2, 2015, at 07:12, Anurag Bhatia <me@anuragbhatia.com> wrote:
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> Hello everyone!
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> I have got two Juniper EX series switches (on virtual chassis) and two SRX=
> devices on native clustering.
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> I am trying to have a highly available redundancy between them with atleas=
t
> 2Gbps capacity all the time but kind of failing. I followed Juniper's
> official page here
> <http://kb.juniper.net/InfoCenter/index?page=3Dcontent&id=3DKB22474> as we=
ll 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>
> .
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> I wish to have a case where devices are connected criss cross and followin=
g
> 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 configuratio=
n
> and VLAN has both ae interfaces called up.
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> If I do not go for criss cross connectivity like this:
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> EX0 (ae1) >> Two Patches to SRX0 (reth1)
> EX1 (ae2) >> Two Patches to SRX1 (reth1)
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> 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=
.
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> If I do criss connectivity, something like:
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> EX0 (ae1) >> Two Patches to SRX0 (reth1)
> EX0 (ae1) >> One patch to SRX1 (reth1)
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> EX1 (ae2) >> Two Patches to SRX1 (reth1)
> EX1 (ae2) >> One patch to SRX0 (reth1)
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> 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.
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> I was wondering if someone can point me out here.
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> Appreciate your time and help!
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> --=20
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> Anurag Bhatia
> anuragbhatia.com
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> Linkedin <http://in.linkedin.com/in/anuragbhatia21> | Twitter
> <https://twitter.com/anurag_bhatia>
> Skype: anuragbhatia.com
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> PGP Key Fingerprint: 3115 677D 2E94 B696 651B 870C C06D D524 245E 58E2
