NOTE
l Actual interval at which BFD packets are transmitted on the local switch = Max { configured interval
transmit-interval at which BFD packets are transmitted on the local switch, configured interval receive-
interval at which BFD packets are received on the peer switch }
l Actual interval at which BFD packets are received on the local switch = Max { configured interval transmit-
interval at which BFD packets are transmitted on the peer switch, configured interval receive-interval at
which BFD packets are received on the local switch }
l Actual time for detecting BFD packets = Actual interval at which BFD packets are received on the local
switch x Configured detection multiplier multiplier-value on the peer switch
For example:
l On the local switch, the configured interval at which BFD packets are transmitted is 200 ms; the interval at
which BFD packets are received is set to 300 ms; the detection multiplier is 4.
l On the peer switch, the configured interval at which BFD packets are transmitted is 100 ms; the interval at
which BFD packets are received is 600 ms; the detection multiplier is 5.
Then:
l On the local switch, the actual interval at which BFD packets are transmitted is 600 ms calculated by using
the formula max {200 ms, 600 ms}; the interval at which BFD packets are received is 300 ms calculated by
using the formula max {100 ms, 300 ms}; the detection period is 1500 ms calculated by multiplying 300
ms by 5.
l On the peer switch, the actual interval at which BFD packets are transmitted is 300 ms calculated by using
the formula max {100 ms, 300 ms}, the actual interval at which BFD packets are received is 600 ms calculated
by using the formula max {200 ms, 600 ms}, and the detection period is 2400 ms calculated by multiplying
600 ms by 4.
----End
4.9.4 Checking the Configuration
After configuring BFD for OSPF, you can view information about the BFD session between
two OSPF neighbors.
Prerequisites
All BFD for OSPF configurations are complete.
Procedure
l Run the display ospf [process-id ] bfd session interface-type interface-number [ router-
id ] or display ospf [process-id ] bfd session { router-id | all } command to check
information about the BFD session between two OSPF neighbors.
----End
4.10 Configuring OSPF GR
Configuring OSPF GR to avoid traffic interruption and route flapping caused by the active/
standby switchover.
4.10.1 Establishing the Configuration Task
Before configuring OSPF GR, familiarize yourself with the applicable environment, complete
the pre-configuration tasks, and obtain the data required for the configuration. This will help
you complete the configuration task quickly and efficiently.
S6700 Series Ethernet Switches
Configuration Guide - IP Routing 4 OSPF Configuration
Issue 01 (2012-03-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
125
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