Disabling Unicast Rpf (Cli Procedure) - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

Complete Software Guide for Junos
Related
Documentation
1340
®
OS for EX Series Ethernet Switches, Release 10.4
uses the same route in both directions between the source and the destination. Do not
enable unicast RPF on asymmetrically routed interfaces. An asymmetrically routed
interface uses different paths to send and receive packets between the source and
the destination.
On an EX3200 or EX4200 switch, ensure that all switch interfaces are symmetrically
routed before you enable unicast RPF on an interface. When you enable unicast RPF
on any interface, it is enabled globally on all switch interfaces. Do not enable unicast
RPF on asymmetrically routed interfaces. An asymmetrically routed interface uses
different paths to send and receive packets between the source and the destination.
To enable unicast RPF, configure it explicitly on a selected customer-edge interface:
[edit interfaces]
user@switch# set ge-1/0/10 unit 0 family inet rpf-check
BEST PRACTICE: On EX3200 and EX4200 switches, unicast RPF is enabled
globally on all switch interfaces, regardless of whether you configure it
explicitly on only one interface or only on some interfaces.
On EX3200 and EX4200 switches, we recommend that you enable unicast
RPF explicitly on either all interfaces or only one interface. To avoid possible
confusion, do not enable it on only some interfaces:
Enabling unicast RPF explicitly on only one interface makes it easier if you
choose to disable it in the future because you must explicitly disable unicast
RPF on every interface on which you explicitly enabled it. If you explicitly
enable unicast RPF on two interfaces and you disable it on only one
interface, unicast RPF is still implicitly enabled globally on the switch. The
drawback to this approach is that the switch displays the flag that indicates
that unicast RPF is enabled only on interfaces on which unicast RPF is
explicitly enabled, so even though unicast RPF is enabled on all interfaces,
this status is not displayed.
Enabling unicast RPF explicitly on all interfaces makes it easier to know
whether unicast RPF is enabled on the switch because every interface
shows the correct status. (Only interfaces on which you explicitly enable
unicast RPF display the flag that indicates that unicast RPF is enabled.)
The drawback to this approach is that if you want to disable unicast RPF,
you must explicitly disable it on every interface. If unicast RPF is enabled
on any interface, it is implicitly enabled on all interfaces.
Example: Configuring Unicast RPF on an EX Series Switch on page 1274
Verifying Unicast RPF Status on page 1349
Disabling Unicast RPF (CLI Procedure) on page 1341
Troubleshooting Unicast RPF on page 1357
Understanding Unicast RPF for EX Series Switches on page 1249
Copyright © 2010, Juniper Networks, Inc.