R3303-HP HSR6800 Routers Layer 2 - WAN Configuration Guide

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Configuring HDLC link bundling
Overview
HDLC link bundling allows you to bundle multiple interfaces using HDLC encapsulation together to form
one logical link.
HDLC link bundling delivers the following benefits:
• Load balancing—Incoming/outgoing traffic is distributed across multiple member interfaces of the
HDLC link bundle.
• Increased bandwidth—The bandwidth on the HDLC link bundle interface is the total bandwidth of
all available member interfaces.
• Improved connection reliability—When a member interface goes down, the traffic on it
automatically switches over to other available member interfaces. This avoids service interruption
and improves the connection reliability of the whole HDLC link bundle.
Basic concepts of HDLC link bundling
HDLC link bundle interface
An HDLC link bundle interface is a logical interface comprising a bundle of HDLC links.
HDLC link bundle
An HDLC link bundle is a group of HDLC interfaces. When you create an HDLC link bundle interface, an
HDLC link bundle numbered the same is automatically generated.
To bring up an HDLC link bundle, it must meet the requirements for the minimum number of selected links
(if set) and minimum amount of bandwidth (if set).
Member interface
An interface assigned to an HDLC link bundle is called "HDLC link bundle member interface."
Only POS interfaces and serial interfaces using HDLC encapsulation can be assigned to HDLC link
bundles.
Bundling priority
When the number of active member interfaces in an HDLC link bundle is limited, only the higher-priority
links within the bundle are active. A lower bundling priority value is a higher priority. HP recommends
that you configure a higher priority on the link you want to configure as the active link.
States of member interfaces
An HDLC link bundle member interface can be in one of the following states:
• Initial—The member interface is down at the link layer.
• Negotiated—The member interface is up at the link layer, but does not meet the conditions for
being a selected interface in the HDLC link bundle.