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

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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.
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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.
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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.
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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.
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You can configure hash-based MLPPP link selection in any of the following ways:
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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.)
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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.)
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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.)
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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
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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
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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
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Use the no version to restore the default round-robin algorithm for MLPPP link
selection.
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See ppp hash-link-selection.
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Configuring Static MLPPP
JUNOSe 11.1.x Link Layer Configuration Guide