Hi Dave, Don,
Yes, Don is correct.
However, our handover is an 802.1ad interface. In .1ad CFI==DEI
My understanding is that this is regardless of SVID ethertype (which is selectable by RSPs
when a handover is ordered) it is still an 802.1ad interface.
Alternatively - an RSP requesting us to change the SVID ethertype, doesn’t stop our
interface from being 802.1ad.
I’m probably getting on some shaky ground here, but that is certainly how it appears to
work on ALU’s implementation. If I’m wrong above, I’m happy to go back to ALU for
Brent Marquis | Layer 2 Network Specialist
[cid:image001.png@01CFE3BD.F1F1E640] Chorus | T : +6448964169 | M :+64272290923
From: nznog-bounces(a)list.waikato.ac.nz [mailto:firstname.lastname@example.org] On Behalf
Of Dave Mill
Sent: Thursday, 9 October 2014 12:14 p.m.
To: Don Stokes
Subject: Re: [nznog] UFB Upload Issues
We are using 0x8100 as the outer TPID in all cases for UFB. We're not certain at the
moment if our equipment is dropping this traffic or if a provider could be. We have a bit
of work to do to establish this still.
Would be interested to see Brent's thoughts on this on or off list :)
On Thu, Oct 9, 2014 at 11:52 AM, Don Stokes
On 09/10/14 09:43, Brent Marquis wrote:
(stuff about CFI/DEI=1 traffic being dropped by Certain Hardware Vendors)
Quick question: are the handovers where this problem is occurring using
tag type 88a8 or 8100?
If it's using 8100, then the bit should be interpreted as CFI, whereas
if it's using 88a8 it should be treated as DEI. Thus, if the type is
88a8, the DEI bit should be treated as such, and equipment that
unconditionally drops DEI=1 traffic is Broken And Needs To Be Fixed.
On the other hand, if an 8100 tagged handover is not clearing CFI, it's
that end that is Behaving Badly and should be fixed. A box dropping
CFI=1 traffic on traffic received with a tag type of 8100 is behaving
NZNOG mailing list
This communication, including any attachments, is confidential and may be legally
privileged. If you are not the intended recipient, you should not read it - please contact
me immediately, destroy it, and do not copy or use any part of this communication or
disclose anything about it. Thank you. No confidentiality or privilege is waived or lost
by any mis-transmission or error. Please note that this communication does not designate
an information system for the purposes of the Electronic Transactions Act 2002.