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/ip neighbor discovery-settings set protocol=cdp,lldp
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The reported SIP phone issue is fixed with this change:
*) fastpath - fixed IP packet receive on bridge and bonding interfaces when destination MAC address match with slave port MAC;
The suggestion to disable MNDP is because in the 6.48 version MNDP had some changes and it now uses an individual slave port MAC address instead of bridge/bond MAC. The same thing is done with other neighbor protocols, but MNDP is the only one that uses IP packets. It turns out, this can affect the ARP table on certain devices and they might start to use this other MAC from MNDP as a destination. On the RouterOS side with an active bridge/bond fast-path, these packets were dropped.
You might not notice the issue because MNDP is sent only once in a minute, the bridge did not use a fast-path or your phone simply ignored the MNDP.
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