[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: Tunnel MTU
Wes,
RFC4459 documents "MTU and Fragmentation Issues with
In-the-Network Tunneling". I'm not aware of a specific
use case analysis, but SEAL offers three distinct "modes"
of operation geared toward anticipated use cases:
- SEAL with Fragmentation Sensing (SEAL-FS) is designed
for performance-intensive core routers connected to
robust links and provides a minimal mechanism for
delivering effective path MTU feedback to the source.
- SEAL with Traffic Engineering (SEAL-TE) supports
controlled segmentation and reassembly between routers
closer to the edges such that a desirable path MTU
(e.g., 1500 bytes) can be supported in low-to-moderate
speed networks (e.g., an ISP network) and truly large
packets (e.g., 1MB) can be supported in environments
such as bulk transfer intensive data centers
- SEAL with Reliability Extensions (SEAL-RE) performs the
same operations as SEAL-TE but also adds an ARQ capability
as well as an integrity check vector that can detect errors
missed by the link layer CRC. Example uses are mobile ad
hoc networks on links with non-negligible interference
characteristics and on aviation data links with both low
data rates and high bit error rates.
(Hey - I think I just wrote a use-case document!)
Fred
fred.l.templin@boeing.com
> -----Original Message-----
> From: Wes Beebee (wbeebee) [mailto:wbeebee@cisco.com]
> Sent: Tuesday, July 28, 2009 11:16 AM
> To: Templin, Fred L; IPv6 Operations
> Subject: RE: Tunnel MTU
>
> Is there a BCP draft out there that surveys all of the MTU
> issues/solutions and makes some recommendations for different use
cases?
>
> - Wes
>
> -----Original Message-----
> From: owner-v6ops@ops.ietf.org [mailto:owner-v6ops@ops.ietf.org] On
> Behalf Of Templin, Fred L
> Sent: Tuesday, July 28, 2009 11:19 AM
> To: IPv6 Operations
> Subject: Tunnel MTU
>
> Hi,
>
> Tunnel MTU issues came up in both the 6rd and CPE router discussions
> today. As near as I can tell, the issues are not going to go away and
> will keep coming up over and over again the more we talk about
> tunneling.
>
> SEAL is proposal that has a real chance of cleaning up the issues once
> and for all. I will be briefing the updates to the document at the
> intarea meeting tomorrow, but in the meantime the draft is here:
>
> http://tools.ietf.org/html/draft-templin-intarea-seal-05
>
> Comments or questions welcome,
>
> Fred
> fred.l.templin@boeing.com