General Information

can be connected together using MAC Bridges. The bridge feature allows the interconnection of
stations connected to separate LANs (using EoIP, geographically distributed networks can be
bridged as well if any kind of IP network interconnection exists between them) as if they were
attached to a single LAN. As bridges are transparent, they do not appear in traceroute list, and no
utility can make a distinction between a host working in one LAN and a host working in another
LAN if these LANs are bridged (depending on the way the LANs are interconnected, latency and
data rate between hosts may vary).
Additional Documents
http://ebtables.sourceforge.net/
Bridge Interface Setup
Home menu level: /interface bridge
Description
To bridge a number of networks into one bridge, a bridge interface should be created, that will
group all the bridged interfaces. One MAC address will be assigned to all the bridged interfaces.
Property Description
ageing-time (time; default: 5m) - how long the host information will be kept in the bridge database
arp (disabled | enabled | proxy-arp | reply-only; default: enabled) - Address Resolution Protocol
setting
forward-delay (time; default: 15s) - time which is spent in listening/learning state
forward-protocols (multiple choice: ip, arp, appletalk, ipx, ipv6, other; default: ip, arp, appletalk,
ipx, ipv6, other) - list of forwarded protocols
• other - all other protocols than AppleTalk, ARP, IP, IPv6, or IPX, e.g., NetBEUI, VLAN, etc.
garbage-collection-interval (time; default: 4s) - how often to drop old host entries in the bridge
database
mac-address (read-only: MAC address) - Media Access Control address for the interface
mtu (integer; default: 1500) - Maximum Transmission Unit
name (name; default: bridgeN) - a descriptive name of the interface
priority (integer: 0..65535; default: 32768) - bridge interface priority. The priority argument is
used by Spanning Tree Protocol to determine, which port remains enabled if two (or even more)
ports form a loop
stp (no | yes; default: no) - whether to enable or disable the Spanning Tree Protocol
Notes
forwarded-protocols is a simple filter that also affects the locally-destined and locally-originated
packets. So disabling ip protocol you will not be able to communicate with the router from the
bridged interfaces.
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