User Manual
Product information and planning
9500 MPR Rel. 3.1
3DB18809AAAA Issue 1 189/980
2.8.17.3.5 802.1p remarking
In addition to VLAN Swap, 802.1p bits remarking are also applied by "hand-off" MPR NE to ATM PW
frames:
– for ingress, IP/MPLS network -> MPR network direction: all frames will be declared as "green"
– for egress, MPR network -> IP/MPLS network direction: 802.1p bits will copy ATM PW Exp Bits
2.8.17.3.6 Tunnel Label
The MPLS Tunnel Label for ATM PW frames is foreseen only for compatibility with ATMoMPLS protocol
stack.
MPR network is actually not using information from MPLS Tunnel Label value in ATM PW frames, for
example:
– forwarding is based on VLAN/MAC DA
– CoS assignment of such frames will be always based on PW Label Exp bits
Tunnel Label fields to be inserted into ATM PW frames generated by MPR are assigned as below reported:
– 20-bit Tunnel Label will be provisioned by ECT/NMS
– EXP bits are copied from PW Label Exp bits
– BoS bit is set to 0
– TTL field is set to 255
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