IP175DLF datasheet(45/145 Pages) ETC

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IP175DLF

Datasheet

3.5

Virtual LAN (VLAN)

IP175DLF is a VLAN aware-switch and support two classification rule: port-based VLAN and tag-based

VLAN. Each port can configure its classification rule respectively. In tag-based VLAN the switch supports

up to 16 VLAN groups. Two ingress VLAN rule and egress VLAN rule are provided. The ingress VLAN

rule is used to discard packet that violate this rule. The egress rule checks VLAN member set and

performs the determination of tagging or un-tagging. In learning process the switch supports shared and

independent VLAN learning.

The VLAN table contains a set of match condition and their actions. Entry 0-5 firstly reserved for

port-based VLAN if the corresponding port is set to port-based VLAN. For instance port 0 is set to

port-based VLAN classification and then entry 0 is reserved for port 0. In port-based VLAN the match

condition does not care and it is only used for tag-based VLAN. The context of VLAN table is placed in MII

VID

FID

Valid

VLAN_MEMBER

ADD_TAG

REMOVE_TAG

LEARN_DIS

STP_IDX_EN STP_IDX QU_NUM_EN QU_NUM

REW_VLAN_PRI_EN

REW_VLAN_PR

Entry 0

Entry 15

match condition

action

Figure 3-2 VLAN table

3.5.1

Port-based VLAN

If any packet is received by a given port, the switch will perform VLAN table searching. User can use the

VLAN Classification Register to set VLAN classification rule on each port. In port-based VLAN

classification, frame is classified based on the port which it arrive. Once a port configures port-based

VLAN, it will occupy the corresponding VLAN entry.

3.5.2

Tag-based VLAN

In tag-based VLAN classification two modes are provided for applying VLAN classification: using VID to

classify VLAN and using PVID to classify VLAN. Using VID to classify VLAN, VID searching is performed

according to frame’s VID. If any packets carrier no VID information, the VID searching is performed using

PVID. In using PVID to classify VLAN the PVID for a given port is used for VID searching, whether VLAN

tagged or untagged frames are received on this port.

3.5.3

VLAN Ingress Filtering

IP175DLF specify a VLAN ingress rule in MII register 22.1. Any frames received on a port are discarded if

it violates this rule.

3.5.4

Shared and Independent VLAN Learning

The learning process supports shared and independent VLAN learning. In shared VLAN learning rule the

learning information from a VLAN can make used by the others VLANs. In independent VLAN learning

rule the learning information from a VLAN makes use only itself. This standard was specified in IEEE

802.1Q.

3.5.5

The determination of the requirement to insert or remove tag

IP175DLF supports the ability of insertion and removal tag header. User can configure the set of ports that

add or remove tag header for each VLAN through MII register 23.8-23. Table 1 is a combination of frame

type and transmission port type.

45/145

August 22, 2014

IP175DLF-DS-R10.1

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