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

JUNOSe 11.1.x Link Layer Configuration Guide
To ensure that the E Series router maintains the proper packet order when
transmitting non-best-effort traffic, you can use the ppp hash-link-selection command
to enable use of a hash-based algorithm to select the link on which the router transmits
high-priority packets on an MLPPP interface.
When you use hash-based link selection instead of the default round-robin link
selection for non-best-effort traffic, the router uses the IP source address (SA) and IP
destination address (DA) of the packet as a hash to select the MLPPP member link
on which to transmit the packet. Specifically, the router uses the hash algorithm to
bind the transmission of all traffic between this IP SA and IP DA to the same member
link in the MLPPP bundle.
If the member link selected to transmit high-priority packets becomes inoperable or
is removed from the MLPPP bundle, the router must select a different link on which
to transmit the packets. As a result, packets transmitted on this new link might
sometimes arrive at the remote destination before the traffic sent on the previously
selected member link.
You can configure hash-based MLPPP link selection in any of the following ways:
For a detailed description and examples of using the ppp hash-link-selection
command, see "ppp hash-link-selection" on page 318.

Platform Considerations

You can configure MLPPP interfaces on the following E Series Broadband Services
Routers:
306
Platform Considerations
To configure hash-based link selection for a individual MLPPP member link, issue
the ppp hash-link-selection command from Interface Configuration mode or
Subinterface Configuration mode in the context of the individual link interface.
For more information, see "Configuring Static MLPPP" on page 312.
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. Doing this has the same effect as
issuing the ppp hash-link-selection command separately for each member link
in the bundle. For more information, see "Contextual Command Differences"
on page 314.
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. For more information, see "Configuring Dynamic MLPPP"
on page 323.
E120 router
E320 router
ERX1440 router
ERX1410 router
ERX710 router