Alcatel-Lucent 7750 SR-OS, Configuration Manual

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Configuring IP Router Parameters
Page 54 7750 SR OS Router Configuration Guide
Echo Support
Echo support for BFD calls for the support of the echo function within BFD. By supporting BFD
echo, the router loops back received BFD echo messages to the original sender based on the
destination IP address in the packet.
The echo function is useful when the local router does not have sufficient CPU power to handle a
periodic polling rate at a high frequency. As a result, it relies on the echo sender to send a high rate
of BFD echo messages through the receiver node, which is only processed by the receiver’s
forwarding path. This allows the echo sender to send BFD echo packets at any rate.
Note that the SR-OS router does not support the sending of echo requests, only the response to
echo requests.