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Date: Fri, 07 Feb 2014 10:08:06 +0900 From: Toshiaki Makita <makita.toshiaki@....ntt.co.jp> To: Sridhar Samudrala <samudrala.sridhar@...il.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Re: VLAN ID 0 with priority tagging (2014/02/07 8:53), Sridhar Samudrala wrote: > On 1/22/2014 3:49 PM, Sridhar Samudrala wrote: >> I am trying to send a packet with VLAN ID 0 and non-zero priority. >> >> The VLAN interfaces are created on 2 hosts using >> ip link add link eth1 eth1.0 type vlan id 0 egress-qos-map 0:2 >> >> When i try to send a packet using ping/arping, on the sender side tcpdump >> shows that the VLAN tag is added with ID 0 and priority 2. >> >> However, the receiver is receiving the packet with vlan tag stripped. >> >> I am seeing the same behavior with multiple NICs and also with a >> switch in >> between the 2 hosts or with the 2 hosts connected over loopback cable. >> >> It looks as if the driver on the send side is stripping the tag if >> vlan id is 0. >> Is this correct behavior or a bug? >> Any clues on how to get priority tagging to work with vlan id 0? >> > I sent this note a few weeks back, but i haven't seen any response so far. > > Is priority tagging with VLAN ID 0 not supported or is this a bug? > It looks like the NIC hardware is stripping the VLAN tag if the id is 0 > even when VLAN tag > is added by the software. eth1.0 should be able to send frames tagged with vid 0. Though I don't know whether there are NICs/drivers that strip tag 0, I can send frames with vid 0 (with e1000e). Toshiaki Makita -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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