R3303-HP HSR6800 Routers Layer 2 - WAN Configuration Guide

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Configuring MP
The router only supports MP bundling across subcards on the same base card. However, an MP-group
interface assigned a subcard number does not support cross-subcard MP bundling.
You can configure MP by using VT or MP-group interfaces.
1. VT interface
VT interfaces are used to configure VA interfaces. After bundling multiple PPP links into an MP link,
create a VA interface for the MP link to exchange data with the peers.
Configuring MP by using VT interfaces can involve an authentication process. The device locates
the specified VT interface according to the username provided by the peer, and creates a bundle
(called VT channel in the system) corresponding to an MP link based on the configuration of the
template.
Multiple bundles can be created on the same VT interface, each of which is an MP link. From the
perspective of the network layer, these links form a point-to-multipoint topology.
The system uses authentication usernames or terminal descriptors for MP bundling 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. An authentication username refers to the username sent
by the supplicant to the authenticator for PAP, CHAP, MS-CHAP, or MS-CHAP-V2
authentication.
{ descriptor—Bundles links by using peer descriptors. Each peer descriptor corresponds to one
bundle. A peer descriptor is received from the peer during LCP negotiation and uniquely
identifies a device.
{ both—Bundles links by using both the authentication username and peer descriptor.
2. MP-group interface
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 easy to configure and
understand.
Configuration task list
To configure MP, complete the following tasks:
Task Remarks
Configuring MP by using a VT interface
Perform either task.
Configuring MP through an MP-group interface
Configuring short sequence number header format negotiation
Optional.
Configuring the MP endpoint descriptor
Optional.
Configuring MP by using a VT interface
When you configure MP by using a VT interface, you can do one of the following: