Licensing Requirements and Limitations for MPLS QoS
Involved Network Elements
Other network elements are not required.
License Requirements
You can use the MPLS QoS feature only after the MPLS function is enabled. The MPLS function is controlled by a license. By default, this function is disabled on a newly purchased switch. To use the MPLS function, apply for and purchase the license from the equipment supplier.
Version Requirements
Product Model |
Minimum Version Required |
|---|---|
CE12804/CE12808/CE12812 |
V100R001C00 |
CE12816 |
V100R003C00 |
CE12804S/CE12808S |
V100R005C00 |
Feature Limitations
- CE switches cannot function as PE devices on an MPLS network.
- When configuring MPLS QoS or MPLS L3VPN QoS, you can configure the MPLS DiffServ mode only on the ingress and egress nodes. The MPLS DiffServ mode does not take effect on the transit node.
- When configuring MPLS L2VPN QoS, you can only set the MPLS DiffServ mode to Uniform, so that the device maps 802.1p priorities of packets to EXP priorities.
On a transit device, all the following cards cannot perform internal priority mapping based on the EXP priority of MPLS packets. By default, these cards map the internal priority based on the 802.1p priority. In this case, you can configure MQC to map the EXP priority of MPLS packets (if-match mpls-exp) to the internal priority (remark local-precedence). The involved cards are as follows: CE-L48GT-EA, CE-L48GT-EC, CE-L48GS-EA, CE-L48GS-EC, CE-L24XS-BA, CE-L24XS-EA, CE-L48XS-BA, CE-L48XS-EA and CE-L24LQ-EA.
- When the switch is not configured with the MPLS PHP function and uses the inner label to forward packets after the outer label pops up (for example, the switch serves as an ASBR in the inter-AS VPN Option B or inter-AS VPN Option C scenario), the EXP in the label of the forwarded packets cannot be obtained from outbound priority mappings based on the PHB, and the EXP in the inner label is used.
- On the CE12800, the user-configured EXP value is preferred as the EXP value in the outer label of L2VPN packets. If no EXP value is configured, the EXP value in the inner label is used as the EXP value in the outer label.
In addition, MPLS QoS is developed based on MPLS LDP. For other configuration notes about MPLS LDP, see MPLS LDP Configuration Notes.