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If the packet is not tagged with VLAN information, the ingress port tags the packet with its
own PVID as a VID (if the port is a tagging port). The interconnect switch then determines if
the destination port is a member of the same VLAN (has the same VID) as the ingress port.
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If the destination port is not a member of the same VLAN, the packet is dropped.
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If the destination port is a member of the same VLAN, the packet is forwarded and the
destination port transmits it on its attached network segment.
Ingress filtering is used to conserve bandwidth within the interconnect switch by dropping
packets that are not on the same VLAN as the ingress port at the point of reception. This
eliminates the subsequent processing of packets that will just be dropped by the destination
port.
To set ingress filtering on a port:
1. Highlight Configure Port Ingress Filter on the IEEE 802.1Q VLANs
Configuration menu.
2. Press the Enter key. The following screen is displayed.
3. Type the range of port numbers you want to configure in the Configure Port field.
4. Toggle between On and Off in the Ingress Filter field.
An ingress filter enables the port to compare the VID tag of an incoming packet with the
PVID number assigned to the port. If the two are different, the port filters (drops) the
packet.
5. Highlight APPLY.
6. Press the Enter key.
IMPORTANT: To save the configuration settings permanently, you must enter them into NVRAM
using the Save Changes option on the main menu. Refer to the "Saving Changes" section earlier
in this chapter.
HP ProLiant BL e-Class C-GbE Interconnect Switch Menu-driven Interface Reference Guide
HP CONFIDENTIAL Codename: DeLorean Part Number: 322858-001 Last Saved On: 2/4/03 11:56 AM
Configuring the Switch Modules using the Menu-driven Interface
2-31
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