Enterasys Vertical Horizon VH-2402-L3 User's Guide download pdf (Page 32)

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The VH-2402-L3 supports 6 Port Trunking groups,

which may include from 2 to 8 switch ports each,

except for a Gigabit Port Trunking group which consists

of the 2 (optional) Gigabit Ethernet ports of the front

panel. These ports are the two 1000BASE-SX, -TX

or GBIC ports contained in a front-panel mounted

module.

IEEE 802.1Q VLANs

IEEE 802.1Q (tagged) VLANs are implemented on the

VH-2402-L3. 802.1Q VLANs allow tagging, which

enables them to span the entire network (assuming all

switches on the network are IEEE 802.1Q-compliant).

IEEE 802.1Q VLANs also allow for dynamic VLAN

registration using GVRP.

VLANs allow a network to be segmented in order to

reduce the size of broadcast domains. All packets

entering a VLAN will only be forwarded to the stations

(over IEEE 802.1Q enabled switches) that are

members of that VLAN, and this includes broadcast,

multicast and unicast packets from unknown sources.

VLANs can also provide a level of security to your

network. IEEE 802.1Q VLANs will only deliver packets

between stations that are members of the VLAN.

Broadcast Storm Control

Broadcast storms consist of broadcast packets that

flood and/or are looped on a network causing

noticeable performance degradation and in extreme

cases, network failure. Broadcast storms can be

caused by malfunctioning NICs, bad cable connections

and applications or protocols that generate broadcast

traffic, among others.

Broadcast storms have long been a concern for

network administrators with routers traditionally being

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Enterasys Vertical Horizon VH-2402-L3 User's Guide Page 32