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

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− Minimum number of Selected interfaces required for bringing up the HDLC link bundle.
− Minimum bandwidth required for bringing up the HDLC link bundle.
None of the P member interfaces will be Selected and they all stay in the Ready state when any of
the following conditions exist:
{ P is smaller than Q.
{ The total bandwidths of the P member interfaces is smaller than the minimum bandwidth
required for bringing up the HDLC link bundle.
Load balancing modes
An HDLC link bundle forwards traffic through its Selected interfaces. When multiple Selected interfaces
exist in an HDLC link bundle, the device chooses the Selected interfaces to forward traffic according to
its load balancing mode.
The following load balancing modes are available:
• Per-flow load balancing—Forwards packets of the same flow out of the same Selected interface. A
flow is identified by match criteria.
{ For IPv4 and IPv6 packets, the match criteria include source IP address and destination IP
address.
{ For MPLS packets, the match criteria are MPLS labels.
• Per-packet load balancing—Distributes packets evenly across all Selected interfaces by using the
round-robin method.
Configuring an HDLC link bundle interface
Configuration restrictions and guidelines
When you configure an HDLC link bundle interface, follow these restrictions and guidelines:
• The minimum number of Selected interfaces required for bringing up an HDLC link bundle cannot
be greater than the maximum number of Selected interfaces allowed in the HDLC link bundle.
• To guarantee correct traffic transmission, HP recommends that you configure each of the following
parameters the same at both ends of an HDLC link bundle:
{ Minimum number of Selected interfaces required for bringing up the HDLC link bundle.
{ Maximum number of Selected interfaces allowed in the HDLC link bundle.
{ Minimum bandwidth required for bringing up the HDLC link bundle.
• After the HDLC link bundle configuration is complete, the state of each member interface is
determined again if you modify any of the following parameters:
{ Minimum number of Selected interfaces required for bringing up the HDLC link bundle.
{ Maximum number of Selected interfaces allowed in the HDLC link bundle.
{ Minimum bandwidth required for bringing up the HDLC link bundle.
• HP recommends that you set the same load balancing mode at both ends of an HDLC link bundle.