[追記あり] RouterOS 6.40からはbridgeにHWオフロードが実装されそうです

Version 6.40rc36 has been released.

Important note!!! Backup before upgrade!
RouterOS v6.40rc36 contains new bridge implementation that supports hardware offloading (hw-offload).
This update will convert all interface "master-port" configuration into new bridge configuration, and eliminate "master-port" option as such.
Bridge will handle all Layer2 forwarding and the use of switch-chip (hw-offload) will be automatically turned on based on appropriate conditions.
The rest of RouterOS Switch specific configuration remains untouched in usual menus for now.
Please, note that downgrading to previous RouterOS versions will not restore "master-port" configuration, so use backups to restore configuration on downgrade.

Before an upgrade:
1) Remember to make backup/export files before an upgrade and save them on another storage device;
2) Make sure the device will not lose power during upgrade process;
3) Device has enough free storage space for all RouterOS packages to be downloaded.

Changes since previous 6.40rc release:

!) bridge - implemented software based "igmp-snooping" (untested, undocumented, CLI only);
!) bridge - implemented software based MSTP (untested, undocumented, CLI only);
!) bridge - implemented software based vlan-aware bridges;
!) switch - "master-port" conversion into a bridge with hardware offload "hw" option (undocumented, CLI only);
!) switch - CRS3xx switch VLAN configuration integrated within bridge VLAN configuration with hw-offload;
*) filesystem - improved error correcting process on tilera and RB1100Dx4 storage;
*) firewall - fixed bridge "action=log" rules;
*) health - fixed memory leak on devices that have "/system health" menu (introduced in 6.40rc30);
*) ikev1 - added log error message if netmask was not provided by "mode-config" server;
*) ipsec - added support for "key-id" peer identification type;
*) rb3011 - fixed packet passthrough on switch2 while booting;
*) sniffer - do not skip L2 packets when "all" interface mode was used;
*) snmp - fixed "/system resource cpu print oid" menu;
*) switch - fixed "loop-protect" on CRS SFP/SFP+ ports;
*) trafficgen - added "lost-ratio" to statistics;
*) vlan - do not delete existing VLAN interface on "failure: already have such vlan";
*) winbox - do not autoscale graphs outside known maximums;
*) winbox - hide LCD menu on CRS112-8G-4S;
*) winbox - show "/system health" only on boards that have health monitoring;
*) winbox - show "D" flag under "/interface mesh port" menu;

/interface bridge port
add bridge=bridge1 hw=no interface=ether1
add bridge=bridge1 hw=no interface=ether6
add bridge=bridge1 hw=no interface=sfp1
add bridge=bridge1 hw=no interface=ether2
add bridge=bridge1 hw=no interface=ether3
add bridge=bridge1 hw=no interface=ether4
add bridge=bridge1 hw=no interface=ether5
add bridge=bridge1 hw=no interface=ether7
add bridge=bridge1 hw=no interface=ether8
add bridge=bridge1 hw=no interface=ether9
add bridge=bridge1 hw=no interface=ether10