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From: | address@hidden |
Subject: | Re: [lwip-devel] Bridge Implementation |
Date: | Fri, 10 Feb 2017 19:02:04 +0100 |
User-agent: | Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.7.2 |
Joel Cunningham wrote:
Some bridge implementation use either a randomly generated one or the one of the first added interface.
That's a strange implementation I also found in linux. I guess it's because it allows end users to create a bridge. End users typically don't have a MAC address to supply to the bridge.
In our world, an 8-port switch implementing e.g. LLDP that has also has an IP address (e.g. for SNMP) should have 9 MAC addresses: one for each port (no IP running there) and 1 for the 9th (virtual) port running an IP stack. Actually you can think of it as a 9 port switch where the 9th port
is only connected internally to a management IC.The difference of the 9th port is that it can receive traffic from all ports, configure the switch (i.e. its forwarding database) and send either to a dedicated port or letting the switch logic select the destination port.
Simon
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