9-78
Configuring Advanced Features
GVRP
Configuring Advanced
Features
Note There must be one common VLAN (that is, one common VID) connecting all
of the GVRP-aware devices in the network to carry GVRP packets. HP recom-
mends the default VLAN (DEFAULT_VLAN; VID = 1), which is automatically
enabled and configured as untagged on every port of the Series 2500 switches).
That is, on ports used for GVRP links, leave the default VLAN set to Untagged
and configure other static VLANs on the same ports as either Tagged, Auto, or
Forbid. (Auto and Forbid are described under “Per-Port Options for Dynamic
VLAN Advertising and Joining” on page 9-82.
General Operation
A GVRP-enabled port with a Tagged or Untagged static VLAN sends advertise-
ments (BPDUs, or Bridge Protocol Data Units) advertising the VLAN (actually,
its 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.
Figure 9-57. Example of Forwarding Advertisements and Dynamic Joining
Core switch 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. Port 1 receives advertise-
ment of VIDs 1, 2, & 3 AND
becomes a member of VIDs
1, 2, & 3.
3. Port 3 advertises VIDs 1, 2,
& 3, but port 3 is NOT a
member of VIDs 1, 2, & 3 at
this point.
4. Port 4 receives advertise-
ment 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.
Port 6 is statically configured
to be a member of VID 3.
11. Port 2 receives
advertisement of VID 3. (Port
2 is already statically
configured for VID 3.
9. Port 3 receives advertise-
ment of VID 3 AND becomes
a member of VID 3. (Still not
a member of VIDs 1 & 2.)
10. Port 1 advertises VID 3.
7. Port 5 receives advertise-
ment of VID 3 AND becomes
a member of VID 3. (Still not
a member of VIDs 1 & 2.)
8. Port 4 advertises VID 3.
6. Port 6 advertises VID 3.
Switch 1
GVRP On
2
Switch 2
GVRP On
3
1
Switch 3
GVRP On
5
4
Static VLAN con-
figured End Device
(NIC or switch)
with GVRP On
6
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