Re: DDR for IPX

From: Manny Gonzalez (manny@xxxxxxx)
Date: Tue Apr 02 2002 - 02:12:36 GMT-3

   
You can definitely use BOTH Demand Circuit and SNAPSHOT together. They
do not step on each other at all. Done this many many times. 

--
Manny Gonzalez.....................CCIE# 9013

Mike Coffin wrote:
>
> Hey guys,
>
> Thought I'd add something to this string.  Got this off of CCO.
>
> http://www.cisco.com/warp/public/779/smbiz/service/knowledge/wan/snapshot.htm
>
> Snapshot and Link State Protocols
>
> Contrary to Distance Vector Protocols, Link State routing protocols send
> periodic "hellos" to the neighbors, as well as Link State Packets.
>
> The hellos are exchanged between the neighbors every 5 or 10 seconds. They
> are inherent in the operation of Link state protocols as they allow the
> discovery of the routing neighbors. They would trigger the link-up every 5
> or 10 seconds. Therefore the Link State routing protocols (NLSP, OSPF,
> IS-IS, ...) are not usable in Dial-on-Demand environments.
>
> EIGRP also relies on the exchange of hellos between neighbors, and for that
> reason, should not be used with Snapshot, either.
>
> Regards,
> -Mike
>
> >From: "Chua, Parry" <Parry.Chua@compaq.com>
> >Reply-To: "Chua, Parry" <Parry.Chua@compaq.com>
> >To: "Ouellette, Tim" <tim.ouellette@eds.com>,        "Lupi, Guy"
> ><Guy.Lupi@eurekaggn.com>
> >CC: <ccielab@groupstudy.com>
> >Subject: RE: DDR for IPX
> >Date: Tue, 2 Apr 2002 12:11:52 +0800
> >
> >I think there is not cinflict for demand circuit and snapshot. deamnd
> >circuit does not shutdown the link but suppress hello and it is available
> >for use. Snapshot does not depends on which routing protocols, it just
> >merely turn on and off for some time. It characteristic suit for routing
> >protocol that send update periodic thus good for non-link state routing
> >protocols. Backup interface is the one that shutdown the link.
> >
> >Floating static should also be able to work with demand circuit.
> >
> >Parry Chua
> >
> >-----Original Message-----
> >From: Ouellette, Tim [mailto:tim.ouellette@eds.com]
> >Sent: Tuesday, April 02, 2002 11:45 AM
> >To: 'Lupi, Guy'
> >Cc: 'ccielab@groupstudy.com'
> >Subject: RE: DDR for IPX
> >
> >
> >My understanding is Snapshot routing is only used for distance vector
> >routing protocols.
> >
> >Also, the whole Demand circuit thing is to keep a link down, which in terms
> >of functionality is the same as snapshot (well, somewhat anyways).
> >
> >Tim
> >
> >-----Original Message-----
> >From: Lupi, Guy [mailto:Guy.Lupi@eurekaggn.com]
> >Sent: Monday, April 01, 2002 4:59 PM
> >To: 'ccielab@groupstudy.com'
> >Subject: DDR for IPX
> >
> >
> >Does anyone know whether or not snapshot routing can be used in conjunction
> >with OSPF demand circuits?  I don't see why not.  Snapshot is the only way
> >to back up IPX correct?

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