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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