R0106-HP MSR Router Series Layer 2 - WAN Configuration Guide(V7)

Configuring MP

MP supports binding interfaces on the same LPU rather than on different LPUs.

You can configure MP by using virtual template (VT) or MP-group interfaces:

• VT interfaces—VT interfaces are used to configure VA interfaces. After binding multiple PPP links

into an MP link, you must create a VA interface for the MP link to exchange data with the peers.

VT interfaces support authentication. The device finds a VT interface for a peer according to the

username provided by the peer, and creates a bundle that corresponds to an MP link based on the

VT settings.

MP can create multiple bundles using the same VT interface. Each bundle is an MP link. From the

perspective of the network layer, these links form a point-to-multipoint topology.

The system uses usernames or terminal descriptors to distinguish multiple MP links under one VT

interface. The following binding modes are available:

{ authentication—Bundles links by using authentication usernames. Each authentication

username corresponds to one bundle. The username is sent by the peer to the authenticator in

PAP, CHAP, MS-CHAP, or MS-CHAP-V2 authentication.

{ descriptor—Bundles links by using descriptors. Each descriptor corresponds to one bundle. A

descriptor is received from the peer during LCP negotiation and uniquely identifies the peer.

{ both—Bundles links by using both the authentication username and descriptor.

• MP-group interfaces—MP-group interfaces are intended only for MP. On an MP-group interface,

only one bundle is allowed, and links cannot be bundled according to the peer descriptor.

Compared with VT interfaces, the configuration of MP-group interfaces is more efficient and easier

to configure and understand.

MP configuration task list

Tasks at a

lance

(Required.) Perform either task:

• Configuring MP by using a VT interface

• Configuring MP through an MP-group interface

(Optional.) Configuring short sequence number header format negotiation

(Optional.) Configuring the MP endpoint descriptor

(Optional.) Configuring LFI

Configuring MP by using a VT interface

You can use either of the following methods to configure MP by using a VT interface:

• Bind physical interfaces to the VT interface by using the ppp mp virtual-template command. If

authentication is not configured, the system binds links according to the descriptor of the peer. If

authentication is configured, the system binds links according to the username, the descriptor of the

peer, or both.

• Associate a username to the virtual template. After the user passes authentication, the system finds

the VT interface associated with the username and bundles links according to the username and the

descriptor of the peer. To ensure a successful link negotiation, configure the ppp mp command and

two-way authentication (PAP, CHAP, MS-CHAP, or MS-CHAP-V2) on the bundled interfaces.