On Wed, Sep 07, 2022 at 10:56:37AM +0200, Michael Walle wrote: > > > I think we are on the same track here. I was ignoring any VFs for now. > > > So I guess, what I'm still missing here is why enet#2 and enet#3 (or > > > even swp4 and swp5) would need a non-random MAC address. Except from > > > your example above. Considering the usecase where swp0..3 is one bridge > > > with eno2 and eno3 being the CPU ports. Then I'd only need a unique > > > MAC address for eno0, eno1 and swp0, correct? > > > > Don't say "unique MAC address for swp0", since swp0's MAC address is not > > unique, you probably mean to say "a MAC address which will be shared by > > swp0-swp3". > > That I actually don't understand. I have the following addresses after > booting: > > # ip link > .. > 4: gbe0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group > default qlen 1000 > link/ether 00:a0:a5:5c:6b:62 brd ff:ff:ff:ff:ff:ff > inet 172.16.1.2/24 scope global gbe0 > valid_lft forever preferred_lft forever > inet6 fe80::2a0:a5ff:fe5c:6b62/64 scope link > valid_lft forever preferred_lft forever > 5: gbe1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default > qlen 1000 > link/ether 00:a0:a5:5c:6b:63 brd ff:ff:ff:ff:ff:ff > 6: eno2: <BROADCAST,MULTICAST> mtu 1504 qdisc noop state DOWN group default > qlen 1000 > link/ether 8e:6c:20:8a:ab:52 brd ff:ff:ff:ff:ff:ff > 7: eno3: <BROADCAST,MULTICAST> mtu 1504 qdisc noop state DOWN group default > qlen 1000 > link/ether c6:fd:b1:88:3c:36 brd ff:ff:ff:ff:ff:ff > 8: swp0@eno2: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN > group default qlen 1000 > link/ether 00:a0:a5:5c:6b:66 brd ff:ff:ff:ff:ff:ff > 9: swp1@eno2: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN > group default qlen 1000 > link/ether 00:a0:a5:5c:6b:67 brd ff:ff:ff:ff:ff:ff > 10: swp2@eno2: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN > group default qlen 1000 > link/ether 00:a0:a5:5c:6b:68 brd ff:ff:ff:ff:ff:ff > 11: swp3@eno2: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN > group default qlen 1000 > link/ether 00:a0:a5:5c:6b:69 brd ff:ff:ff:ff:ff:ff > > gbe0 is eno0 and gbe1 is eno1. So in my case they are unique. > > When adding all the ports to a bridge, the bridge gets the lowest MAC. > > # ip link add name br0 type bridge > # ip link set swp0 master br0 > # ip link set swp1 master br0 > # ip link set swp2 master br0 > # ip link set swp3 master br0 > > 12: br0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT > group default qlen 1000 > link/ether 00:a0:a5:5c:6b:66 brd ff:ff:ff:ff:ff:ff > > Is that what you mean with "a MAC address which will be shared by > swp0-swp3"? No, what I'm trying is only to reformulate what you've said, "Then I'd only need a unique MAC address for eno0, eno1 and swp0". My understanding of what you mean by "unique address for swp0" is that the addresses for swp1-swp3 don't matter (hence they can be set to the same address as swp0) since there will be a bridge that serves as the IP termination point, with its own MAC address, inherited from the first bridge port, swp0. But this makes it improper to call it a "unique address for swp0".
