Re: VSS and PFC3A

Hi Martin,

Good to know - though I haven't used epagp with either of those switches
to date.

regards Andy

Martin Kiefer wrote:
> Just a quick add to this, 2960 and 3560s does support epagp as well.
>
> Best regards
> Martin
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Andy
> Reid
> Sent: 5. august 2009 17:38
> To: Martin Kiefer
> Cc: 'GS CCIE-Lab'
> Subject: Re: VSS and PFC3A
>
> Hi Martin,
>
> Yes, that is why I specifically talked about a backup Ethernet
> connection - life is so much easier with a direct Ethernet connection.
> If you have a switch stack or chassis in the middle then you need to
> enable Enhanced PAgP. This uses PAgP messaging over the MEC links in
> order to communicate between the two chassis through a neighbor switch.
> Note that the neighbor switch must support the PAgP enhancements. This
> is only supported on the 3750, 4500, 6500 and 6500 VSS switches - each
> has a minimum IOS required.
>
> regards Andy
>
> Martin Kiefer wrote:
>
>> 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 Thu Aug 06 2009 - 10:46:50 ART