Configuring Access Node Control Protocol on Cisco ASR 9000 Series Routers
How to Configure ANCP on Cisco ASR 9000 Series Routers
QC-94
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide
OL-23108-02
MC-LAG, using ICCP (Inter-Chassis Communication Protocol). ANCP on the standby PoA for the
MC-LAG applies the DSL rate data to the corresponding MC-LAG VLAN subinterfaces. When an event
occurs that causes one of the standby PoAs to assume the active role for the MC-LAG, the ANCP
application on the newly active PoA has already applied the DSL rates to shapers on the MC-LAG VLAN
subinterfaces, so the correct DSL rates are applied when this LAG goes active and congestion and
subsequent data loss does not occur at the DSLAM.
A DSLAM establishes an ANCP adjacency with a router over a TCP connection. The DSL rates for the
DSLAM subscriber circuits are communicated over this TCP connection. The DSL rates are applied to
Layer 2 VLAN subinterfaces that are mapped to the subscriber circuits. The ANCP TCP connection that
is used to send DSL rates for Layer 2 VLAN subinterfaces on an MC-LAG must be on a Layer 3 VLAN
subinterface that is in the same MC-LAG as the L2VLAN subinterfaces. Note that this constraint implies
that there is one ANCP TCP connection between the DSLAM and router per MC-LAG.
Figure 2 ANCP over MC-LAG VLAN Subinterfaces
When an active PoA for a MC-LAG becomes the standby, the DSLAM ANCP TCP connection is
terminated. The DSLAM re-establishes the ANCP TCP connection with the PoA that assumes the active
role for the MC-LAG.
How to Configure ANCP on Cisco ASR 9000 Series Routers
This section contains instructions for the following tasks:
• Enabling ANCP, page 94
• Configuring ANCP Server Sender Name, page 96
• Configuring ANCP Neighbors, page 97
• Mapping AN Ports to VLAN Subinterfaces, page 100
• Configuring ANCP Rate Adjustment, page 102
Enabling ANCP
To enable ANCP, use the ancp command in global configuration mode.
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MC-LAG
L3 VLAN
L2 VLAN
L2 VLAN
L2 VLAN
ANCP TCP Traffic
Subscriber Traffic
Subscriber Traffic
Subscriber Traffic
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