Re: [netext] I-D Action: draft-ietf-netext-logical-interface-support-03.txt

Sri Gundavelli <sgundave@cisco.com> Wed, 07 September 2011 23:19 UTC

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Date: Wed, 07 Sep 2011 16:21:13 -0700
From: Sri Gundavelli <sgundave@cisco.com>
To: <Basavaraj.Patil@nokia.com>, <brian.haley@hp.com>
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Thread-Topic: [netext] I-D Action: draft-ietf-netext-logical-interface-support-03.txt
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Cc: netext@ietf.org
Subject: Re: [netext] I-D Action: draft-ietf-netext-logical-interface-support-03.txt
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Hi Raj:



On 9/7/11 2:57 PM, "Basavaraj.Patil@nokia.com" <Basavaraj.Patil@nokia.com>
wrote:

> 
> Following up on Brian's point, the I-D says in Sec 4.1:
> 
> "
> Depending on the OS support, it might
>       be possible to use more than one physical interface at a time --
>       so the node is simultaneously attached to different media -- or
>       just to provide a fail-over mode.  Controlling the way the
>       different media is used (simultaneous, sequential attachment, etc)
>       is not trivial and requires additional intelligence and/or
>       configuration at the logical interface device driver.  An example
>       of this type of solution is the Logical interface, which is
>       defined in this document, or the bonding driver (a Linux
>       implementation).
> 
> "
> 
> Do you have examples of implementations wherein a logical interface is
> able to use multiple physical interfaces simultaneously?
> 

I can think of the Linux bridge control interface, where the physical
interface are put in a bridge mode.

Since you asked :)

http://www.mendeley.com/research/applicability-virtual-interface-intertechno
logy-handoffs-proxy-mobile-ipv6/


> The multiple-care-of-address solution for MIP6 enables the MN to be
> simultaneously attached to an HA via different interfaces. But in such a
> model, you have different CoAs associated with those physical interfaces.
> 

Slight difference though. In the MCoA model, the HoA is bound to virtual
interface, however the tunnel is established from the IP addresses
associated with a physical interface. The relation between the two being the
tunnel providing the routing path for the home address on the virtual
interface.

Regards
Sri