M A G N U M 6 K S W I T C H E S , M N S - 6 K U S E R G U I D E
the default VLAN set to untagged
and configure other static VLANs on the ports as
either “Tagged or Forbid
”
.
(“Forbid” is discussed later in this chapter.)
GVRP Operations
A GVRP-enabled port with a Tagged or Untagged static VLAN sends advertisements (BPDUs, or
Bridge Protocol Data Units) advertising the VLAN identification (VID). Another GVRP-aware
port receiving the advertisements over a link can dynamically join the advertised VLAN. All
dynamic VLANs operate as Tagged VLANs. Also, a GVRP-enabled port can forward an
advertisement for a VLAN it learned about from other ports on the same switch. However, the
forwarding port will not itself join that VLAN until an advertisement for that VLAN is received
on that specific port.
F
IGURE
127
–
GVRP operation – see description below
2
Switch 1
GVRP On
2
Switch 1
GVRP On
3
Switch 2
GVRP On
1
3
Switch 2
GVRP On
3
Switch 2
GVRP On
1
5
Switch 3
GVRP On
4
5
Switch 3
GVRP On
5
Switch 3
GVRP On
4
Static VLAN
configured end
device (NIC or
switch) with
GVRP on
6
Static VLAN
configured end
device (NIC or
switch) with
GVRP on
6
Switch 1 with static VLANs (VID= 1, 2, & 3). Port 2 is a member of VIDs 1, 2, & 3.
1.
Port 2 advertises VIDs 1, 2, & 3
2.
On Switch 2 - Port 1 receives advertisement of VIDs 1, 2, & 3 AND becomes a member
of VIDs 1, 2, & 3
3.
As discussed above, a GVRP enabled port can forward advertisement for a VLAN it
learnt about. So port 3 advertises VIDs 1, 2, & 3, but port 3 is NOT a member of VIDs 1,
2, & 3 at this point, nor will it join the VLAN until and advertisement is received
4.
On Switch 3, port 4 receives advertisement of VIDs 1, 2, & 3 and becomes a member of
VIDs 1, 2, & 3
5.
Port 5 advertises VIDs 1, 2,& 3, but port 5 is NOT a member of VIDs 1, 2, & 3 at this
point
6.
Port 6 on the end device is statically configured to be a member of VID 3. Port 6
advertises VID 3
7.
Port 5 receives advertisement
8.
Port 4 advertises VID 3
9.
Port 3 receives advertisement of VID 3 AND becomes a member of VID 3. (Still not a
member of VIDs 1 & 2 as it did not receive any advertisements for VID 1 or 2)
10.
Port 1 advertises VID 3 AND becomes a member of VID 3. (Port 1 is still not a member
of VIDs 1 & 2)
11.
Port 2 receives advertisement of VID 3. (Port 2 was already statically configured for VIDs
1, 2, 3)
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