Configuring Advanced

Features

 

 

Configuring Advanced Features

GVRP

N o t e

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 advertisements (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.

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.

Switch 1

 

Switch 2

 

 

Switch 3

 

 

 

Static VLAN con-

 

GVRP On

 

GVRP On

 

 

GVRP On

 

 

 

figured End Device

 

 

 

 

 

 

 

(NIC or switch)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

with GVRP On

 

 

2

 

 

 

 

3

 

 

 

5

 

 

 

 

 

 

 

1

 

 

4

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11. Port 2 receives

9. Port 3 receives advertise-

7.

Port 5 receives advertise- 6. Port 6 advertises VID 3.

advertisement of VID 3. (Port

ment of VID 3 AND becomes

ment of VID 3 AND becomes

2 is already statically

a member of VID 3. (Still not

a member of VID 3. (Still not

configured for VID 3.

a member of VIDs 1 & 2.)

a member of VIDs 1 & 2.)

 

10. Port 1 advertises VID 3.

8.

Port 4 advertises VID 3.

Figure 9-57. Example of Forwarding Advertisements and Dynamic Joining

9-78