MAGNUM 6K SWITCHES, MNS-6K USER GUIDE
11. Port 2 receives advertisement of VID 3. (Port 2 was already statically configured for VIDs 1, 2, 3) If a static VLAN is configured on at least one port of a switch, and that port has established a link with another device, then all other ports of that switch will send advertisements for that VLAN. In the figure below, tagged VLAN ports on switch “A” and switch “C” advertise VLANs 22 and 33 to ports on other GVRP-enabled switches that can dynamically join the VLANs. A port can learn of a dynamic VLAN through devices that are not aware of GVRP (Switch “B”.)
FIGURE 122 – VLAN Assignment in GVRP enabled switches. Non GVRP enabled switches can impact VLAN settings on other GVRP enabled switches
Switch A
GVRP On
Tagged
VLAN 22
Switch B
No GVRP
Tagged
VLAN 22
Switch C
GVRP On
Tagged
VLAN 22
Tagged
VLAN 33
Switch D
GVRP On
Dynamic
VLAN 33
Dynamic
VLAN 22
Switch E
GVRP On
Dynamic
VLAN 33
Dynamic
VLAN 22
15
11
12
3
6
7
2
Switch C
Port 5 dynamically joined VLAN 22
Ports 11, 12 belong to Tagged VLAN 33
Switch E
Port 2 dynamically joined VLAN 33
Ports 7 dynamically joined VLAN 33
Switch D
Port 3 dynamically joined VLAN 33
Ports 6 dynamically joined VLAN 33
Switch A
GVRP On
Tagged
VLAN 22
Switch B
No GVRP
Tagged
VLAN 22
Switch C
GVRP On
Tagged
VLAN 22
Tagged
VLAN 33
Switch D
GVRP On
Dynamic
VLAN 33
Dynamic
VLAN 22
Switch E
GVRP On
Dynamic
VLAN 33
Dynamic
VLAN 22
15
11
12
3
6
7
2
Switch C
Port 5 dynamically joined VLAN 22
Ports 11, 12 belong to Tagged VLAN 33
Switch E
Port 2 dynamically joined VLAN 33
Ports 7 dynamically joined VLAN 33
Switch D
Port 3 dynamically joined VLAN 33
Ports 6 dynamically joined VLAN 33
An “unknown VLAN” is a VLAN that the switch learns of by GVRP. For example, suppose that port 1 on switch “A” is connected to port 5 on switch “C”. Because switch “A” has VLAN 22 statically configured, while switch “C” does not have this VLAN statically configured, VLAN 22 is handled as an “Unknown VLAN” on port 5 in switch “C”. Conversely, if VLAN 22 was statically configured on switch C, but port 5 was not a member, port 5 would become a member when advertisements for VLAN 22 were received from switch “A”. GVRP provides a per-port join-request option which can be configured.
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