From: Mike Coffin (mikecoffin01@xxxxxxxxxxx)
Date: Tue Apr 02 2002 - 01:37:03 GMT-3
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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