Prerequisites For Configuring Ancp; Restrictions For Configuring Ancp; Information About Configuring Ancp; Ancp Adjacencies - Cisco ASR 9000 Series Configuration Manual

Prerequisites for Configuring ANCP

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Prerequisites for Configuring ANCP

Restrictions for Configuring ANCP

The following restrictions apply when configuring ANCP on your network:
• Only Rate Adaptive Mode is supported in Cisco IOS XR Release 3.7.2.
• VPN routing and forwarding (VRF) awareness is not supported in Cisco IOS XR Release 3.7.2. All IP
• ANCP over IPv6 is not supported for Cisco IOS XR Release 3.7.2.
• Only VLAN subinterfaces over Ethernet and Ethernet bundle ports can be mapped to AN ports using

Information About Configuring ANCP

To implement ANCP, you must understand the following concepts:

ANCP Adjacencies

The ANCP server accepts TCP connections from access nodes. An ANCP neighbor is any access node that
establishes an adjacency with an ANCP server. ANCP is configured globally, and as long as it is IP-enabled,
there is no restriction on whether ANCP messages are received on the physical or logical interface.
TCP creates a separate connection socket for each access node. Because access nodes are not identified
explicitly in ANCP messages, the TCP socket serves as the ANCP neighbor identifier for the ANCP server.
Once the TCP connection between ANCP neighbors has been made, the ANCP adjacency protocol establishes
an ANCP session over that connection and negotiates ANCP capabilities. There is a single ANCP session per
ANCP neighbor. ANCP session information becomes a subset of the information of a corresponding neighbor.
ANCP protocol supports dynamic neighbor detection so no configuration of access nodes is required. ANCP
neighbors can also be statically preconfigured on the ANCP server. In such a case, access nodes are explicitly
identified by their IDs, which then must match the sender-name field in the ANCP adjacency protocol
messages.

Neighbor Adjacency Timing

The adjacency timer defines the maximum delay between different stages of ANCP session establishment
and the period of ANCP keepalive.
Cisco ASR 9000 Series Aggregation Services Router Modular Quality of Service Configuration Guide, Release
6.1.x
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Additional References, page 36
Configuring Access Node Control Protocol, page 37
interfaces receiving ANCP traffic should be in default VRF.
ANCP.
Configuring Access Node Control Protocol