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This output shows two BFD sessions on the router’s two interfaces. The BFD client<br />

is OSPF, and the timers that we configured are shown. The last line for each interface,<br />

Remote heard, hears us, indicates that the OSPF link is operating properly. If the<br />

link fails, neither side initially hears the other:<br />

aviva@RouterG> show bfd session detail<br />

Transmit<br />

Address State Interface Detect Time Interval Multiplier<br />

10.0.1.1 Up fe-0/0/1.0 1.500 0.500 3<br />

Client OSPF, TX interval 0.500, RX interval 0.500, multiplier 3<br />

Session up time 00:16:55<br />

Local diagnostic None, remote diagnostic None<br />

Remote heard, hears us<br />

10.0.0.2 AdminDown fe-1/0/1.0 3.000 1.000 3<br />

Session down time 00:00:09, previous up time 00:05:09<br />

Local diagnostic NbrSignal, remote diagnostic AdminDown<br />

Remote not heard, doesn't hear us<br />

Once the link is completely down and the BFD session fails, the link is no longer<br />

shown:<br />

aviva@RouterG> show bfd session detail<br />

Transmit<br />

Address State Interface Detect Time Interval Multiplier<br />

10.0.1.1 Up fe-0/0/1.0 1.500 0.500 3<br />

Client OSPF, TX interval 0.500, RX interval 0.500, multiplier 3<br />

Session up time 00:18:10<br />

Local diagnostic None, remote diagnostic None<br />

Remote heard, hears us<br />

1 sessions, 1 clients<br />

Cumulative transmit rate 2.0 pps, cumulative receive rate 2.0 pps<br />

12.13 Moving OSPF Traffic off a Router<br />

Problem<br />

You are getting ready to perform router maintenance and you want to move all OSPF<br />

traffic off the router.<br />

Solution<br />

Configure the router so that it appears to be overloaded with OSPF traffic:<br />

[edit protocols ospf]<br />

aviva@RouterG# set overload<br />

<strong>Discussion</strong><br />

As you are preparing to perform maintenance on a router in a production network,<br />

you want to move traffic off that router so that network services are not interrupted<br />

during your maintenance window. The set overload command tricks the router into<br />

Moving OSPF Traffic off a Router | 411<br />

This is the Title of the Book, eMatter Edition<br />

Copyright © 2008 O’Reilly & Associates, Inc. All rights reserved.

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