Steinar, Arie: thanks for confirming this! In addition, Cisco 3750 Metro series also support custom S-tag TPID value on trunk ES ports with "switchport trunk dot1q ethertype" command. "switchport trunk dot1q ethertype" affects all the egress traffic, i.e. even single-tagged egress frames( http://www.cloudshark.org/captures/27dfdd102ed7).
regards, Martin On Thu, Jan 2, 2014 at 6:34 AM, Arie Vayner (avayner) <[email protected]>wrote: > Martin, > > From a quick check I could see support for both 802.1ad (0x88a8) and other > custom S-tags (0x9100) on ASR9K. I can also see references on 7600 with ES+ > modules. > > Some references: > https://supportforums.cisco.com/docs/DOC-15556 > > http://www.cisco.com/en/US/docs/routers/asr9000/software/asr9k_r4.2/lxvpn/command/reference/b_lxvpn_cr42asr9k_chapter_01.html#wp1086679105 > > http://www.cisco.com/en/US/products/ps9853/products_tech_note09186a0080c1d17b.shtml > > HTH > Arie > > > -----Original Message----- > From: cisco-nsp [mailto:[email protected]] On Behalf Of > [email protected] > Sent: Wednesday, January 1, 2014 9:24 PM > To: [email protected] > Cc: [email protected] > Subject: Re: [c-nsp] Difference between Cisco Q-in-Q and IEEE 802.1ad > > > I made a simple setup where Cisco Q-in-Q port("switchport mode > > dot1q-tunnel") was facing a laptop. Laptop was sending out frames with > > 802.1q tag(VID was 10) and Cisco Q-in-Q port pushed another 802.1q field. > > Final frame can be seen here: > > http://www.cloudshark.org/captures/ae485b68e9ed > > > > Based on this Cisco Q-in-Q frame, the only difference between IEEE > > 802.1ad frame and Cisco Q-in-Q frame is that former has 0x88a8 as an > > TPID value for S-tag? I made a small illustration for this: > > Correct, it's 0x88a8 vs 0x8100 for the S-tag. > > > In addition, are there Cisco switches out there which use 0x88a8 as a > > TPID value of S-tag by default? > > Don't know of any. > > > Last but not least, which devices use 0x9100 as a TPID value for > > S-tags? According to drawing in Wikipedia IEEE 802.1ad article, some > > do: > > Juniper E-series (ERX) routers use 0x9100 by default. > > Steinar Haug, Nethelp consulting, > [email protected]_______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
