JamesLuther Mon, 03/09/2009 - 04:56
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Hi,


snapshot routing is used on ISDN/dial lines. Routing protocols normally send periodic hello packets however for an dial line then this could turn out to be expensive.


For the RIP protocol this is called snapshot routing. For ospf this is called demand circuit (ip ospf demand-circuit). However the pricnciple is the same betwen the two.




Regards

adamclarkuk_2 Mon, 03/09/2009 - 04:57
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Hi


Snapshot routing is a way of controlling Routing updates from Distance Vector protocols that get sent over links that can be 'expensive' to use, such as ISDN.


You can control when updates are sent, overriding the default values.


Link state/hybrid protocols can not use this as they use neighbors to maintain databases incorporating hellos which Snapshot routing breaks.

lorenzomele Mon, 03/09/2009 - 05:06
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Does it mean that snapshot routing is the way updates are sent on ISDN lines? Or snapshot routing can be properly configured, in order to minimize the number of updates?


Thanks


Lorenzo

JamesLuther Mon, 03/09/2009 - 05:12
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Hi,


snapshot routing will mean the routing protocol will be quite. So it will initally swap routes and then stay quite unless there is a state change. Whereas normally it would send periodic updates/hellos.



Regards

adamclarkuk_2 Mon, 03/09/2009 - 05:13
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It is a way of controlling when the updates are sent

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