Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 587)

Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide 563
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Local VLL
4
1. The internal priority is determined.
2. When Vll-local COS is configured, this value overrides internal priority.
3. The outgoing outer VLAN COS is mapped from internal priority through use of the egress
encoding map by default. The internal priority does not affect the outgoing inner VLAN COS
4. The outgoing outer VLAN COS is preserved when qos pcp encode-policy off is configured
on the outgoing interface.
5. The outgoing inner VLAN COS is the COS in the incoming packet.
Untagged Endpoint 1 (EP1) to Double-Tagged Endpoint 2 (EP2).
1. The internal priority is determined.
2. When Vll-local COS is configured, this value overrides internal priority.
3. The outgoing outer VLAN COS is mapped from internal priority through the use of the
egress encoding map by default. The internal priority does not affect the outgoing inner
VLAN COS.
4. The outgoing outer VLAN COS is zero when qos pcp encode-policy off is configured on the
outgoing interface.
5. The outgoing inner VLAN COS would be zero.
Double-Tagged Endpoint 1 (EP1) to Single-Tagged Endpoint 2 (EP2).
1. The internal priority is determined.
2. When Vll-local COS is configured, its value overrides internal priority.
3. By default, the outgoing VLAN COS is mapped from the internal priority by use of the
egress encoding map.
4. The outgoing VLAN COS is equal to the incoming, inner VLAN COS when qos pcp
encode-policy off is configured on the outgoing interface.
CoS behavior for Local VLL
NOTE
This section assumes that the user understands how QoS works.
Table 94 describes the expected Class of Service (CoS) behavior for VLL packets when Local VLL is
in effect.
TABLE 94 Expected class of service behavior for Local VLL
Local VLL endpoints Incoming packet Outgoing packet
Outer VLAN Inner VLAN Outer VLAN Inner VLAN
Dual-tagged to
dual-tagged X Y X’ or X Y
Single-tagged to
dual-tagged X N/A X’ or X X