In my opinion, a tunnel is when you take one packet and encapsulate it with
an additional routing protocol header in order to pass it over a transit
network transparently. So, DLSW uses tunnels, GRE tunnels are obviously
tunnels, PIM register messages are tunnels, etc. That's just a brief
definition but it works for me.
At 01:19 PM 5/28/01, you wrote:
>Question came up on the CCIE group revolving around the meaning of the term
>"tunnel"
>
>I think I am seeing where the author of the below quote is going. I'm
>wondering if one of the folks on this group might be willing to offer some
>insight.
>
>The question originated with someone calling an OSPF virtual link a tunnel.
>After some back and forth, someone offered the following (edited for
>brevity, and clarity):
>
>"...understand the basics of software tunneling. TUNNELING PROVIDES
>ALTERNATIVE TO THE NATIVE CONNECTIVITY PROCEDURE. In this case there is no
>physical/datalink connectivity, so connectivity is achieved through software
>interface.
>
>" Virtual Links are not tunnels, you can't transport traffic over them, they
>just carry routing information. They are TUNNELING this routing information
>through area 1. THIS IS THE PRINCIPLE OF TUNNELLING. IT IS NOT ONLY
>APPLICATION DATA THAT IS TUNNELED : IN THIS CASE ROUTING UPDATES ARE BEING
>TUNNELED!
>
>"you seem to know only Cisco exam material (tunnel interfaces) please read
>further afield and grasp generics/basics of software programming principles,
>"
>
>Can anyone offer further clarification here?
>
>Thanks
>
>Chuck
>
>One IOS to forward them all.
>One IOS to find them.
>One IOS to summarize them all
>And in the routing table bind them.
>
>-JRR Chambers-
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