RE: VSS and PFC3A

Travis,

ePAGP is supported using a single 3750 not MCE. So, if you have 2 3750s stacked and each 3750 has a single 10 Gig uplink to a pair of VSS, you can not use ePAGP for dual active detection.

Thanks,
Reza

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Travis Niedens
Sent: Wednesday, August 05, 2009 11:37 AM
To: martin_at_kiefer.dk; ccielab_at_groupstudy.com
Subject: RE: VSS and PFC3A

Per this:

http://www.cisco.com/en/US/products/ps9336/products_tech_note09186a0080a7c837
.shtml#vsl_llr

Cisco 3750 can do dual-active as of 12.2(46)SE with ePaGP.

Travis

> From: martin_at_kiefer.dk
> To: ccielab_at_groupstudy.com
> Subject: RE: VSS and PFC3A
> Date: Wed, 5 Aug 2009 17:15:52 +0200
>
> Hi.
>
> I agree with you both, a dual active link is a good thing to have in a VSS
> setup, but remember that Dual active detection does not work on a Cisco
3750
> stack. Most people I have seen are using the 6500 as either core or
> distribution with 3750s as either access or distribution switches, and that
> makes often things a bit more complicated if they wishes to use dual active
> detection.
>
> Best regards
> Martin
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> KRATTIGER Lukas
> Sent: 4. august 2009 20:13
> To: ccie_at_reid.it
> Cc: Ram Shummoogum; ccielab_at_groupstudy.com
> Subject: AW: VSS and PFC3A
>
> Hi Andy
> correct, I certainly do also not recommend deploying VSS without the
> "sync-link" but it's not a must.
> Your points are all correct.
> Cheers
> -Lukas
>
> ________________________________
>
> Von: Andy Reid [mailto:ccie_at_reid.it]
> Gesendet: Di 04.08.2009 18:32
> An: KRATTIGER Lukas
> Cc: Ram Shummoogum; <ccielab_at_groupstudy.com>
> Betreff: Re: VSS and PFC3A
>
>
> Well Lukas,
>
> I strongly disagree - I certainly do not recommend deploying VSS without
the
> 'sync-link'.
> This 'sync-link' is known as VSLP dual-active fast-hello and it uses
special
> hello messages over a backup Ethernet connection. Dual-active fast-hello is
> faster than IP BFD and does not require support from a neighbor switch.
> It is one of three mechanisms used by the virtual switching system in order
> to detect a dual-active scenario if the VSL fails.
> A VSL failure is important to protect against as both chassis become
active.
> This can obviously have adverse effects on network stability because both
> chassis use the same IP addresses, SSH keys, and STP bridge ID.
> If a client still wishes to go ahead without the additional link, then I
> raise it as a risk which the client accepts before proceeding with the
> implementation. The only times this has been raised is when the chassis are
> some distance apart and the link has to be leased. At all other times the
> link should be implemented as standard if both chassis are within the same
> data-center.
>
> regards Andy
>
>
> KRATTIGER Lukas wrote:
>
> Hi Andy
> Your so called sync-link is not needed, this will run on the 10G VSL
> links.
> There is no requirement to have an additional 1G link between the
> chassis.
> A 1g link for dual-active detection would be helpfull but not
> required.
> Cheers
> -Lukas
>
> ________________________________
>
> Von: Andy Reid [mailto:ccie_at_reid.it]
> Gesendet: Di 04.08.2009 17:20
> An: KRATTIGER Lukas
> Cc: Ram Shummoogum; ccielab_at_groupstudy.com
> Betreff: Re: AW: AW: VSS and PFC3A
>
>
>
> Hi Ram,
>
> Remember if you have 10GE cards installed it is not possible to
> remove
> their DFC's as they come installed as standard, which leaves the
> upgrade
> supervisor option. Note that you cannot have two supervisors in the
> same
> chassis when switching to VSS mode (at least not at the current SXI
> release). Only one supervisor in each chassis is supported, and each
> must be a VS-S720-10GE-3C or VS-S720-10GE-3CXL. It is not possible
> to
> use an older supervisor in each chassis and use 10GE cards (such as
> the
> 4, 8 or 16 port versions).
> Don't forget that you also need a synchronization link between the
> two
> chassis once cut-over - this is usually a 1GE copper link if they
> are
> the same room - it does not carry client traffic but information
> such as
> keep-alives and state information.
>
> regards Andy
>
> KRATTIGER Lukas wrote:
>
>
> Hi Ram
>
>
>
> You are correct. The DFC, CFC are on the linecards. There
> are also
> limitations according to the daughter cards.
>
> The only VSS compatible Supervisor is the
> VS-S720-10GE-3C/XL. It's a
> Sup720 with 2x 10G and PFC3c on it. All other Sups are not
> able to do
> VSS.
>
>
>
> I hope this helps.
>
>
>
> Cheers
>
> -Lukas
>
>
>
> Von: Ram Shummoogum [mailto:rshummoo_at_ca.ibm.com]
> Gesendet: Dienstag, 4. August 2009 16:44
> An: KRATTIGER Lukas
> Cc: ccielab_at_groupstudy.com
> Betreff: Re: AW: VSS and PFC3A
>
>
>
>
>
> Thanks for getting back so fast.
>
> When you say remove the PFC3A and replace with CFC or
> DFC3c/DFC3cXL: Are
> you referring to the SUP720. I thought CFC and DFC are only
> for
> linecards.
>
> For the line cards I am good as they are new and are DFC3C.
>
> Thanks
>
>
>
>
>
>
> "KRATTIGER Lukas" <Lukas.KRATTIGER_at_nextiraone.ch>
> <mailto:Lukas.KRATTIGER_at_nextiraone.ch>
>
> 08/04/2009 10:38 AM
>
> To
>
> Ram Shummoogum/Quebec/IBM_at_IBMCA, <ccielab_at_groupstudy.com>
> <mailto:ccielab_at_groupstudy.com>
>
> cc
>
>
> Subject
>
> AW: VSS and PFC3A
>
>
>
>
>
>
>
>
> Hi Ram
>
> Just remove your PFC3A and replace it with a CFC or buy a
> DFC3c/DFC3cXL.
> These are your two options.
> A VSS will never work with distributed forwarding below 3c.
> Just as a side note: The linecards for your VSLs need to
> have a
> DFC3c/DFC3cXL on it.
>
> Cheers
> -Lukas
>
>
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Received on Wed Aug 05 2009 - 14:12:39 ART