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cisco router encryption question

using cisco routers, such as the 2500 series and other high end routers. what encryption protocols do they offer when communicating with each other over a network?

for example when they route tcp/ip data, or they update their routing tables. is there a way to encrypt that data? if so how.

also. is there a way to encrypt ALL data that the router sends. i assume this will cause performance loss but i'm still curious to know if any to all protocols can be encrypted in some shape way or form.
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Les Moore
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ok thanks for the links. i shall be doing more reading now :-D