Blade ICE G8000 manual 2Port-based Vlan assignment

RackSwitch G8000 Application Guide

Figure 3-2through Figure 3-5illustrate generic examples of VLAN tagging. In Figure 3-2, untagged incoming packets are assigned directly to VLAN 2 (PVID = 2). Port 5 is configured as a tagged member of VLAN 2, and port 7 is configured as an untagged member of VLAN 2.

NOTE – The port assignments in the following figures are not meant to match the G8000.

Figure 3-2Port-based VLAN assignment

		PVID = 2
Untagged packet
				4
CRC	Data	SA	DA	Port

Before

Port 1		Port 2	Port 3
	802.1Q Switch
Port 6		Port 7	Port 8

Port 5

Tagged member of VLAN 2

Untagged member of VLAN 2

BS45011A

As shown in Figure 3-3, the untagged packet is marked (tagged) as it leaves the switch through port 5, which is configured as a tagged member of VLAN 2. The untagged packet remains unchanged as it leaves the switch through port 7, which is configured as an untagged member of VLAN 2.

Figure 3-3802.1Q tagging (after port-based VLAN assignment)

PVID = 2

Port 4

Port 1		Port 2	Port 3
	802.1Q Switch
Port 6		Port 7	Port 8

Tagged member of VLAN 2

5
Port	CRC*	Data	Tag	SA	DA
(*Recalculated)

Untagged memeber	CRC
of VLAN 2
	Data

Outgoing SA

8100	Priority	CFI	VID = 2
16 bits	3 bits	1 bits	12 bits
	After

untagged packet (unchanged)

DA

Key
Priority	- User_priority
CFI	- Canonical format indicator
VID	- VLAN identifier

BS45012A

BMD00041, November 2008 Chapter 3: VLANs „ 53