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FTOS Configuration Guide for the C-Series - Force10 Networks

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Figure 430 Viewing Established Sessions <strong>for</strong> OSPF Neighbors<br />

R2(conf-router_ospf)#bfd all-neighbors<br />

R2(conf-router_ospf)#do show bfd neighbors<br />

* - Active session role<br />

Ad Dn - Admin Down<br />

C - CLI<br />

I - ISIS<br />

O - OSPF<br />

R - Static Route (RTM)<br />

Changing OSPF session parameters<br />

BFD sessions are configured with default intervals and a default role. The parameters that can be<br />

configured are: Desired TX Interval, Required Min RX Interval, Detection Multiplier, and system role.<br />

These parameters are configured <strong>for</strong> all OSPF sessions or all OSPF sessions on a particular interface; if<br />

you change a parameter globally, <strong>the</strong> change affects all OSPF neighbors sessions. If you change a<br />

parameter at interface level, <strong>the</strong> change affects all OSPF sessions on that interface.<br />

To change parameters <strong>for</strong> all OSPF sessions:<br />

Step Task Command Syntax Command Mode<br />

1 Change parameters <strong>for</strong> OSPF<br />

sessions.<br />

To change parameters <strong>for</strong> OSPF sessions on an interface:<br />

View session parameters using <strong>the</strong> command show bfd neighbors detail, as shown in Figure 426 on<br />

page 607.<br />

Disabling BFD <strong>for</strong> OSPF<br />

bfd all-neighbors interval milliseconds<br />

min_rx milliseconds multiplier value role<br />

[active | passive]<br />

ROUTER-OSPF<br />

Step Task Command Syntax Command Mode<br />

1 Change parameters <strong>for</strong> all OSPF<br />

sessions on an interface.<br />

OSPF BFD Sessions Enabled<br />

LocalAddr RemoteAddr Interface State Rx-int Tx-int Mult Clients<br />

* 2.2.2.2 2.2.2.1 Gi 2/1 Up 100 100 3 O<br />

ip ospf bfd all-neighbors interval<br />

milliseconds min_rx milliseconds<br />

multiplier value role [active | passive]<br />

INTERFACE<br />

If BFD is disabled globally, all sessions are torn down, and sessions on <strong>the</strong> remote system are placed in a<br />

Down state. If BFD is disabled on an interface, sessions on <strong>the</strong> interface are torn down, and sessions on <strong>the</strong><br />

remote system are placed in a Down state (Message 26 on page 607). Disabling BFD does not trigger a<br />

change in BFD clients; a final Admin Down packet is sent be<strong>for</strong>e <strong>the</strong> session is terminated.<br />

612 Bidirectional Forwarding Detection

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