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Re: [sfc] TTL field within the NSH base header

Eric C Rosen <erosen@juniper.net> Mon, 01 May 2017 18:32 UTC

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To: James N Guichard <james.n.guichard@huawei.com>
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From: Eric C Rosen <erosen@juniper.net>
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Date: Mon, 01 May 2017 14:29:16 -0400
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Archived-At: <https://mailarchive.ietf.org/arch/msg/sfc/RAg2hiB5d7QnWaWAFIQzjGEjgwI>
Subject: Re: [sfc] TTL field within the NSH base header
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On 5/1/2017 1:38 PM, James N Guichard wrote:
> SHL (SFF Hop Limit)

I hate to interrupt the discussion of modular arithmetic with a 
terminology issue, but I'd recommend against this terminology change.  
"TTL" is a pretty well known term with a well known use. Inventing a new 
acronym here can only cause confusion.  I don't think anyone's suggested 
modifying the IP specs to change "TTL" to "IP Hop Limit".

(Once upon a time, there was some thinking that it might take a packet 
more than a second to transit a router, and the original IP TTL 
requirement was to decrement the TTL by at least 1 per hop, but by more 
than 1 if the packet spent more than a second in a given router.  But 
for most of the last 40 years, everyone has known that "TTL" means "hop 
count".)

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