ProCurve 5300xl Specifications download pdf (Page 26)

VLANs can overlap on a single port. For example, it may be advantageous to have a server

connected through a single port to be a member of two different VLANs

such that two different

groups of PCs can access the same server, but the two groups of PCs cannot talk directly with

each other.

IEEE 802.1Q VLAN Support

The ProCurve 5300xl Switch Series support the IEEE 802.1Q VLAN tagging standard. The

ProCurve 5300xl Switch Series can have multiple VLAN traffic streams share a single physical

link. 802.1Q also allows interoperability at this level between different vendors in a standards-

based way. End-to-end VLAN designation is also greatly simplified through the 802.1Q tag,

particularly if GVRP, discussed in the next section, is used.

Ports with only a single VLAN designation can be designated as untagged ports. Packets leaving

these ports will not be 802.1Q tagged. VLAN continuity from switch-to-switch must be manually

maintained at each switch if untagged ports are used.

GVRP

GVRP—GARP VLAN Registration Protocol is a standard under 802.1Q that provides a facility to

dynamically configure a VLAN on switches throughout a Layer 2 domain when that VLAN has

been statically configured on at least one switch in the domain. The intention with GVRP is to

automatically interconnect a VLAN that is manually configured on two switches that are not

contiguous in a Layer 2 domain. This greatly reduces the administrative overhead of having to

define VLANs in all the intermediate switches between two VLAN islands that need to be

interconnected. GVRP will also delete a dynamic VLAN on any switch port that hasn’t heard

externally from the VLAN in the last 10 seconds.

GVRP is particularly advantageous in environments using 802.1X, for network login. In 802.1X,

as a user is authenticated to the switch from the RADIUS server, a VLAN membership can also

be indicated. This allows the network manager to assign a particular user to a particular VLAN

to establish the network services available for that user. For example, when the user logs in,

she can be placed in her own VLAN along with the servers and storage that contains the

services that user is allowed to have. One of the advantages of 802.1X is the ability for the user

to login anywhere in the network. If she is assigned to a VLAN that also has services members,

that VLAN will have to be defined all along the path between the user and those services. GVRP

will automatically do this. GVRP will also delete that VLAN along the path once it is no longer

needed.

The ProCurve 5300xl Switch Series has a configuration default of 8 VLANs maximum that can be

defined. If GVRP is enabled, the ‘maximum VLANs to support’ value should be configured in

most cases to be the maximum number of VLANs expected in the entire network environment

supported by GVRP. This will provide space for dynamic VLAN definitions that come about

through GVRP.

IGMP

Internet Group Multicast Protocol (IGMP) is a multicast control protocol that builds delivery

paths through the switch network. The switch eavesdrops on IGMP traffic so that it knows which

ports are part of which multicast groups. If there is no multicast router available, the ProCurve

5300xl Switch Series can act as an IGMP querier to learn which end nodes have subscribed to

which multicast streams. The switch can then direct a specific multicast stream to only those

switch segments that have nodes that have joined the multicast group associated with that

stream. Configuration of this feature is a single check box to turn it on. The ProCurve 5300xl

Switch Series supports IGMP version 3 by recognizing and processing IGMPv3 joins. Version 3 is

backwards compatible with versions 1 and 2.

The ProCurve 5300xl Switch Series supports a maximum of 389 IGMP groups.

Guaranteed Minimum Bandwidth (GMB)

Guaranteed Minimum Bandwidth (GMB) provides a certain minimum consideration for traffic

priorities vying for output from the switch. For instance, if the customer has directed all of his

VOIP traffic to be 802.1p priority 7 (high priority), Guaranteed Minimum Bandwidth could be

used to make sure that some minimum level of throughput is always available to service this

application. Alternatively, some small level of Guaranteed Minimum Bandwidth could be applied

to the other priority queues to make sure that other applications on the network will not be

starved (any leftover bandwidth after servicing the minimums is always given away on demand

If multiple VLANs to a server are done using 802.1Q, the server must also support 802.1Q tagging.

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ProCurve 5300xl Specifications Page 26

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