From: Mike Williams (ccie2be@swbell.net)
Date: Fri May 09 2003 - 16:55:17 GMT-3
According to our Cisco rep, there is supposed to be an IOS later this
year that would allow for failover in as little as 3 seconds (SSO)
instead of the 30-60 seconds with RPR+ (Our 6500s take about 50
seconds). But, depending on what you're doing with your network, and if
you have mutliple 6500s (which we do) we have HSRP between the Sups on
the different 6500s, so that the routing burden shifts to the other 6500
while the redundant Sup "initalizes". Having said that, there are some
things that definitely depend on stateful information that could be lost
like this. It seems many of the blades have their own stateful
redundancy, though, like the CSM so that we can have one CSM in each
6500 and if one fails, the "backup" CSM in the "backup" 6500 could take
over statefully and all load balancing continue as normal after the HSRP
failover.
OH well..... Fun stuff eh?
Mike W.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
MADMAN
Sent: Friday, May 09, 2003 12:40 PM
To: jfaure@sztele.com
Cc: Colin Barber; ccielab@groupstudy.com; 'dmadlan@qwest.com'
Subject: Re: 6500 Flexwan modules & Msfc
I don't mind Native mode though I wish they would implement SSO ofr a
quicker failover, curretny supports RPR+ when you have redundant sups.
Also Native doesn't yet support most voice modules which depending on
your point of view could be a good thing;)
Dave
jfaure@sztele.com wrote:
> What do you think about migrating the 6500 to native IOS? Perhaps, it
> maybe the best solution
>
>
>
> Juan Faure Ferrer
> email: jfaure@sztele.com
>
> Lmnea de Negocio de Telematica y CC
> Ingeniero de Integracisn de Redes y Sistemas
> ----------------------------------------------------------------------
> ------
>
> SOLUZIONA TELECOMUNICACIONES
> Servicios Profesionales de UNION FENOSA
> Jerez, 3
> 28016 MADRID
> tel 91 579 30 00 fax 91 350 72 83
> ----------------------------------------------------------------------
> -----
>
>
>
>
> "Colin Barber"
> <Colin.Barber@telew Para:
"'dmadlan@qwest.com'"
> est.co.uk> <dmadlan@qwest.com>,
"'jfaure@sztele.com'"
> <jfaure@sztele.com>,
> 09/05/03 16:23 ccielab@groupstudy.com
> cc:
> Asunto: RE: 6500 Flexwan
modules & Msfc
>
>
>
>
>
> As I said it depends on your requirements. Using SRM you only have one
> active router and therefore you cannot load balance. Also fail over
> time is greater than with HSRP on the VLANS.
>
> Colin
>
> -----Original Message-----
> From: MADMAN [mailto:dave@interprise.com]
> Sent: 09 May 2003 14:42
> To: Colin Barber
> Cc: 'jfaure@sztele.com'; ccielab@groupstudy.com
> Subject: Re: 6500 Flexwan modules & Msfc
>
>
>
> What you really need to do is run the MSFC's in SRM, single router
> mode. This way you will have automatic redundancy if the case of an
> MSFC failure. Otherwise if you loose your MSFC that controlls the
> flexwan you will have to manually configure your second MSFC, not a
> good plan.
>
> Dave
>
> Colin Barber wrote:
>
>>This is normal. You need to copy the POS configuration into the
>>startup config of the second MSFC. When the switch over occurs then
>>the second
>
> MSFC
>
>>will see the FlexWAN interfaces and load the config.
>>
>>What you must not do is do a write mem on the second MSFC because it
>>will not have the FlexWAN config in it's running config and will erase
>>it from the startup config. Any changes that you make to the primary
>>MSFC should
>
> be
>
>>made to the secondary's running config and also changed in it's
>>startup config file via TFTP.
>>
>>There are different ways to overcome this. You can have the second
>>MSFC
>
> as
> a
>
>>standby (i.e. not running) and once the primary fails it loads up and
>>becomes the primary. This gets around the config issue as any changes
>>written to memory on the primary are copied over to the secondary. The
>>Native IOS solution also works in this way. The only problem with this
>>is both routers are not active as the same time so you cannot do
>
> load-balancing
>
>>with HSRP etc and I think the fail over takes longer.
>>
>>Colin
>>
>>-----Original Message-----
>>From: jfaure@sztele.com [mailto:jfaure@sztele.com]
>>Sent: 09 May 2003 10:23
>>To: ccielab@groupstudy.com
>>Subject: 6500 Flexwan modules & Msfc
>>
>>
>>Hi all:
>>
>>We have a 6500 switch with a flex wan card to support POS interfaces.
>>We are using catos 6.3.8 and IOS (msfc) 12.1.8bE11. The problem we
>>have is that the POS interface only appears in one of the two msfcs we
>>have in
>
> the
>
>>chassis (we have two SP cards & 2 msfcs).
>>
>>Anyone knows if this is normal? Supposing the main SP goes down, then
>>you`d need to configure the second msfcs for operating with the pos
>>interfaces. It seems a very limited implementation, if this is so.
>>
>>Any help would be apreciated.
>>
>>Regards
>>
>>Juan Faure Ferrer
>>email: jfaure@sztele.com
>>
>>Lmnea de Negocio de Telematica y CC
>>Ingeniero de Integracisn de Redes y Sistemas
>>
>
> ----------------------------------------------------------------------
> ------
>
>
>>SOLUZIONA TELECOMUNICACIONES
>>Servicios Profesionales de UNION FENOSA
>>Jerez, 3
>>28016 MADRID
>>tel 91 579 30 00 fax 91 350 72 83
>>
>
> ----------------------------------------------------------------------
> -----
>
>>
> ----------------------------------------------------------------------
> ------
>
> --
>
>>Live Life in Broadband
>>www.telewest.co.uk
>>
>>
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>
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> ======================================================================
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> ==
>
>>
>
>
> --
> David Madland
> CCIE# 2016
> Sr. Network Engineer
> Qwest Communications
> 612-664-3367
>
> "Government can do something for the people only in proportion as it
> can do something to the people." -- Thomas Jefferson
>
>
> ----------------------------------------------------------------------
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> Live Life in Broadband
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>
>
> The information transmitted is intended only for the person or entity
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-- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367"Government can do something for the people only in proportion as it can do something to the people." -- Thomas Jefferson
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