Cos behavior for vll tagged mode and vll raw mode – Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) User Manual
Page 553
EXP Bits in VC label
Priority queue
6, 7
qosp3 (highest priority)
4, 5
qosp2
2, 3
qosp1
0, 1
qosp0 (best effort)
Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
529
53-1003031-02
How MPLS VLL works
4
CoS behavior for VLL tagged mode and VLL raw mode
This section describes the difference in CoS behavior for VLL traffic when tagged mode or raw
mode is in effect.
CoS behavior for VLL tagged mode
NOTE
This section assumes that the user understands how QoS works.
NOTE
On Brocade NetIron CES and Brocade NetIron CER devices, when VLL is configured in tagged mode,
the priority present in inner VLAN tag is not copied to the VLAN being sent out over the endpoint.
describes the expected Class of Service (CoS) behavior for VLL packets when VLL tagged
mode is enabled.
TABLE 82
Expected class of service behavior for VLL tagged mode
VLL endpoints
Incoming packet
MPLS cloud
Outgoing packet
Outer VLAN
Inner VLAN
Tunnel/VC
label (Z)
Payload tag
Outer VLAN
Inner VLAN
Dual-tagged
to dual-tagged
X
Y
V or internal
priority
Y
W or Y
Y
Single-tagged
to dual-tagged
X
N/A
X
W or X
X
Untagged
to dual-tagged
N/A
N/A
0
W or 0
0
Dual-tagged
to
single-tagged
X
Y
Y
W or Y
N/A
NOTE
For more specific examples of CoS behavior for tagged mode, see
dual-tagged to dual-tagged VLL endpoints”
dual-tagged to single-tagged VLL endpoints”
Legend for
V = mapped EXP bits from internal priority (X contributes to internal priority) using the EXP
encode table.