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Re: [v6ops] I-D Action: draft-townsley-troan-ipv6-ce-transitioning-00.txt

Wuyts Carl <Carl.Wuyts@technicolor.com> Mon, 19 December 2011 07:40 UTC

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From: Wuyts Carl <Carl.Wuyts@technicolor.com>
To: Ole Troan <otroan@employees.org>, Gert Doering <gert@space.net>
Date: Mon, 19 Dec 2011 08:39:23 +0100
Thread-Topic: [v6ops] I-D Action: draft-townsley-troan-ipv6-ce-transitioning-00.txt
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Cc: IPv6 Operations <v6ops@ietf.org>, "draft-townsley-troan-ipv6-ce-transitioning@tools.ietf.org" <draft-townsley-troan-ipv6-ce-transitioning@tools.ietf.org>
Subject: Re: [v6ops] I-D Action: draft-townsley-troan-ipv6-ce-transitioning-00.txt
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Small Q: so you consider "BFD-support" to be mandatory on the CPE ?

regs
Carl




-----Original Message-----
From: v6ops-bounces@ietf.org [mailto:v6ops-bounces@ietf.org] On Behalf Of Ole Troan
Sent: woensdag 14 december 2011 14:41
To: Gert Doering
Cc: IPv6 Operations; draft-townsley-troan-ipv6-ce-transitioning@tools.ietf.org
Subject: Re: [v6ops] I-D Action: draft-townsley-troan-ipv6-ce-transitioning-00.txt

Gert,

>> in the case of a link to ISP A was down, the CPE could of course forward traffic with SA = ISP A out ISP B's link. if it was stopped by ingress filtering the host would get an ICMP back from the PE instead of the CPE.
> 
> Would it?
> 
> ISP B's PE has no route to send ISP A's prefix to that CPE, so how 
> would the ICMP reach the host?

good point.

OK, for auto-detection of ingress filtering. we could use "BFD echo mode". like what we do for 6rd BR reachability check.
the CPE generates a packet with SA = DA = one of its own addresses from ISP A. this packet it forwards to the ISP B.

cheers,
Ole
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