For IEEE 802, including Ethernet, multicast is realized as a filtered broadcast. Both use a group address with the address's I/G bit set to 1.
A broadcast is relayed to every active port (IEEE 802.3 clause 126.96.36.199) but the one is was received on (a MAC bridge must not cause a loop as per IEEE 802.1D clause 7.1.1).
A multicast is modelled as (optionally) ...
If you plan to create a ring of switches, all those switches need to support RSTP or MSTP.
That is, unless all the unmanaged switches completely ignore IEEE 802.1D and actually forward the RSTP BPDUs - which is very ugly but quite common. (That way, the RSTP switch sees its own BPDUs from one ring port coming in through the other one, and blocks the one with ...
You normally would just overwrite it with e. g.:
vlan 1 ip address 10.10.10.11/8
But if you stay on the same subnet, the switch will complain:
The IP address (or subnet) 10.10.10.11/8 already exists.
If this is the case (you want to stay in the same subnet and just change the IP address inside this subnet), then you'll have to delete the previous IP ...
If both B & C share the same broadcast domain on an unmanaged switch and the same IP subnet, they should be able to see each other and there must be something actively preventing them to communicate.
The ping output indicates that they're even unable to ARP resolve each other's IP addresses, adding to the mystery.
I see a few potential causes:
It's poorly documented but Jesse's hit the nail on the head:
The switch uses the IP default gateway only while operating as a Layer
2 device. While routing is enabled on the switch, the IP default
gateway is not used.
So, you'll need to add
ip route 0.0.0.0 0.0.0.0 192.168.2.1
When network setup is new , initially mac -address table in switch will be empty because there are no request received by switch to forward frames towards destination no ARP flooding and no broadcast traffic to create mac-address table in switch . When a request reaches towards switch it's associated mac-address table is created .
To get full mac-address ...