From: MADMAN (dave@interprise.com)
Date: Fri May 09 2003 - 12:50:56 GMT-3
I have found the doc that states what Colin is refering to and
apparently you do a force switchover of the MSFCs and then configure and
save the flexwan configs on both routers.
Thanks for the heads up Colin!!
Dave
MADMAN wrote:
>
>
> Unless something changed you can't configure the secondary router with
> the FlexWan interface, IT doesn't recognize them!!! That is the problem
> and the reason config sync and then SRM were developed.
>
> Yes situations are differant I am only saying that running two MSFCs
> individually in a single 6500 chassis with a FlexWan is a bad idea.
>
> If you can configure a flexwan interface on the secondry MSFC what
> IOS/OS supports this, can you provide the URL as I am not aware of this.
>
> Dave
>
> Colin Barber wrote:
>
>> You don't have to manually reconfigure the router if it fails! Now that
>> would be a rubbish solution. You just need to make sure the startup
>> config
>> on the secondary router is correct and contains the interface
>> configuration,
>> then the interface will come up and work in about the same time as SRM
>> mode
>> but the advantage is your VLANs switched over after 3 seconds not 30 -
>> 180
>> seconds.
>>
>> As I have already stated all situations are different. That's why you
>> have a
>> choice. Most people will not have a requirement to load balance
>> however some
>> will. If a single MSFC could handle everybody's requirements why have the
>> MSFC2 and MSFC3 become available?
>>
>> Colin
>>
>> -----Original Message-----
>> From: MADMAN [mailto:dave@interprise.com]
>> Sent: 09 May 2003 15:30
>> To: Colin Barber
>> Cc: 'dmadlan@qwest.com'; 'jfaure@sztele.com'; ccielab@groupstudy.com
>> Subject: Re: 6500 Flexwan modules & Msfc
>>
>>
>>
>> So, why do you need two active routes? Are your MSFC's that busy,
>> I bet not, are you load balancing for load balancings sake? This is
>> how 7500's with dual RSPs run basically.
>>
>> How fast is fail over if you loose your active MSFC for the FlexWan
>> at 3AM and someone has to manually reconfigure the POS interface????
>>
>> Dave
>>
>> Colin Barber wrote:
>>
>>> 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
>>>>
>>>
>>>
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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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