From: Colin Barber (Colin.Barber@telewest.co.uk)
Date: Fri May 09 2003 - 13:00:18 GMT-3
You are correct in that the secondary router will not see the interface. You
have two options to configure it. Either remove the primary sup so the
secondary will see it, configure it and save the config or make a
configuration file on your workstation and save it to the secondary MSFCs
NVRAM.
This is not an ideal situation and Cisco recommend SRM however it can be
done as above and was the only way before SRM came along.
-----Original Message-----
From: MADMAN [mailto:dave@interprise.com]
Sent: 09 May 2003 16:32
To: Colin Barber
Cc: 'dmadlan@qwest.com'; 'ccielab@groupstudy.com'
Subject: Re: 6500 Flexwan modules & Msfc
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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>>
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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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