Cisco SCE2020-4XGBE-SM - Limitations

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Cisco SCE 2000 and SCE 1000 Software Configuration Guide
OL-7827-12
Chapter 13 MPLS/VPN Support
Service Control MPLS/VPN Requirements
Limitations
Mutually exclusive system modes
When the system works in MPLS/VPN mode, the following modes are not supported:
• The following tunneling modes:
– MPLS traffic engineering skip
– MPLS VPN skip
– L2TP skip
– VLAN symmetric classify
• TCP Bypass-establishment
• DDoS
• Value Added Services (VAS) mode
Number of MPLS labels
• The choice of the unique VPN site must be based on the BGP label only. The BGP label must be the
innermost label.
• The MPLS/VPN solution supports various combinations of labels. See Additional MPLS Pattern
Support.
• The system does not support VPNs for which other MPLS-related features, such as MPLS-TE or
MPLS-FRR, are enabled.
Subscriber-related limitations
The following subscriber-related limitations exist in the current solution:
• The SM must be configured to operate in Push mode.
• VLAN-based subscribers cannot be used.
• Introduced subscriber aging is not supported when using VPN-based subscribers.
• Maximum number of VPN-based mappings per single subscriber:
– 200 (standalone)
– 50 (cascade)
Topology-related limitations
• An asymmetrical routing topology in which the traffic may be unidirectional, is not supported, since
the MPLS/VPN solution relies on the bidirectional nature of the traffic for various mechanisms.
TCP related requirements
• Number of Upstream TCP Flows – There must be enough TCP flows opening from the subscriber
side on each PE-PE route in each period of time. The higher the rate of TCP flows from the
subscriber side, the higher the accuracy of the mechanism can be.