Radiance 10/100 Mbps Services Line Card
46
Management Frames in Q-in-Q Mode
The R821 provides two options to forward management frames in Q-in-Q
mode when the management channel is tagged. One option encapsu-
lates IP-based management frames and the other bypasses tagging. If
encapsulation is selected, a management frame will egress double-
tagged with both the service provider’s tag and the management VLAN
tag. If bypass is selected, a management frame will egress single-tagged
with only the management VLAN tag.
If no management VLAN is configured, outbound management frames
always egress untagged regardless of whether encapsulate or bypass is
selected.
The following table displays how management frames are forwarded in
Q-in-Q mode under various conditions.
Encapsulate/Bypass
Mgmt VLAN
Mgmt Frame Tag
Encapsulate
Yes
Double-tagged
Encapsulate
No
Untagged
Bypass
No
Untagged
Bypass
Yes
Single-tagged
R821
Access
Port
Trunk
Port
Q-in-Q Mode
PVID = 2
(p-bits = assigned queue)
untagged
tagged
tagged
double-tagged
25
25
2
2
untagged
untagged
dropped
priority-tagged
0
priority-tagged
0
tagged without PVID
3
tagged without PVID
3