Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010 Configuration Manual page 350

JUNOSe 11.1.x Link Layer Configuration Guide
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Configuring Static MLPPP
Use to enable use of a hash-based algorithm to select the link on which the router
transmits non-best-effort (high-priority) packets, such as voice or video, on an
MLPPP interface.
Hash-based MLPPP link selection is available only for non-best-effort traffic. For
best-effort traffic, the router uses a round-robin algorithm for link selection.
Using hash-based link selection instead of the default round-robin link selection
for non-best-effort traffic ensures that the router maintains the proper packet
order when transmitting high-priority packets.
When you configure hash-based link selection, the router uses the IP source
address and IP destination address of the packet as a hash to select the MLPPP
member link on which to transmit the packet.
You can configure hash-based MLPPP link selection in any of the following ways:
To configure hash-based link selection for an individual MLPPP member link
interface, issue the ppp hash-link-selection command from Interface
Configuration mode or Subinterface Configuration mode in the context of
the link interface. (See Example 1.)
To configure hash-based link selection for all current member links in an
MLPPP bundle, issue the ppp hash-link-selection command from Interface
Configuration mode in the context of the MLPPP bundle. (See Example 2.)
To configure hash-based link selection for all dynamic MLPPP link interfaces
created by a profile, issue the ppp hash-link-selection command from
Profile Configuration mode. (See Example 3.)
Example 1 The following commands configure hash-based MLPPP link selection
for an individual MLPPP member link interface.
host1(config)#interface atm 2/0
host1(config-if)#interface atm 2/0.2
host1(config-subif)#atm pvc 42 0 42 aal5snap
host1(config-subif)#encapsulation mlppp
host1(config-subif)#ppp hash-link-selection
Example 2 The following commands configure hash-based MLPPP link selection
for all current member links in the MLPPP bundle (group1). Doing this has the
same effect as issuing the ppp hash-link-selection command separately for
each member link in the bundle.
host1(config)#interface mlppp group1
host1(config-if)#ppp hash-link-selection
Example 3 The following commands configure hash-based MLPPP link selection
for all dynamic MLPPP interfaces created by the profile named dynamicMlppp.
host1(config)#profile dynamicMlppp
host1(config-profile)#ppp multilink enable
host1(config-profile)#ppp hash-link-selection
Use the no version to restore the default round-robin algorithm for MLPPP link
selection.
See ppp hash-link-selection.