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[lwip-devel] [patch #7993] Add support for transmitting packets with VLA
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From: |
Mike Pontillo |
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Subject: |
[lwip-devel] [patch #7993] Add support for transmitting packets with VLAN headers |
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Date: |
Fri, 17 Jan 2014 22:50:27 +0000 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.77 Safari/537.36 |
Follow-up Comment #2, patch #7993 (project lwip):
The Class of Service (CoS) field is separate from DiffServ/DSCP. I don't think
anything at the IP layer should influence the 802.1q CoS.
I'm not sure it even makes sense for an end device to apply a VLAN CoS. A
switch would probably just ignore it and reapply its own CoS value, depending
on what the network administrator has configured for that VLAN's priority.
Typically I'd think the 802.1q header should be applied at the interface
level, but I think this patch might be OK for a lightweight environment.
I just had to respond to this because I'd hate to see upper-layer PCBs
influence the 802.1q CoS.
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