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
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
Howard C. Berkowitz wrote:
In the most general sense, a tunnel is a means of taking a protocol
data unit payload of OSI layer N of protocol family P1: (N,P1)-PDU,
and transmitting it with a delivery header at layer M of protocol
family P2. What is actually transmitted is, minimally, a
Tunneling, in general, is taking data (whether user data, routing
information, etc), encapsulating it in another protocol for travel (i.e.
TCP/IP), and sending it to a destination where the other end unwraps the
encapsulation and then uses the data (whether user data, routing
information, etc).
as to whether of not an OSPF
virtual link is a tunnel. It is not.
Chuck
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Marty Adkins
Sent: Monday, May 28, 2001 7:24 PM
To: [EMAIL PROTECTED]
Subject:Re: Question on the meaning of tunneling [7
-
From: Chuck Larrieu
To:
Sent: Tuesday, May 29, 2001 1:18 AM
Subject: RE: Question on the meaning of tunneling [7:6136]
Did some more research. In the context of the question, I went to the RFC
to
see what the source says. It occurred to me that the behaviour of virtual
links must
]
Subject:Re: Question on the meaning of tunneling [7:6136]
Virtual links are part of the backbone, and behave as if they were
unnumbered point-to-point networks between the two routers.
its a virtual link. its an unnumbered network. a network/segmrnt
nonetheless, and that description sounds
PROTECTED]
Subject: Re: Question on the meaning of tunneling [7:6136]
Virtual links are part of the backbone, and behave as if they were
unnumbered point-to-point networks between the two routers.
its a virtual link. its an unnumbered network. a network/segmrnt
nonetheless
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