Netgear XCM8810 Chassis User Manual - Page 781
vMAN, Tag Usage at the vMAN Access Switch
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Chapter 30. vMAN (PBN) 8800 Chassis Switch VLAN 1 vMAN VLAN 1 Figure 96. vMAN VLAN 2 vMAN access ports (untagged vman ports) vMAN network ports (tagged vman ports) vMAN network ports (tagged vman ports) VLAN 2 vMAN access ports (untagged vman ports) EX_vman_0001A The entry points to the vMAN are the access ports on the vMAN edge switches, which function as PBs. Customer VLAN traffic that is addressed to locations at other vMAN access ports enters the ingress access port, is switched through the vMAN, and exits the egress access port. If you do not configure any frame manipulation options, the frames that exit the vMAN are identical to the frames that entered the vMAN. All vMAN ports except the access ports are vMAN network ports. The configuration of the network ports establishes the vMAN. Figure 96 shows two terms that are used during vMAN configuration: untagged vman port and tagged vman port. When you configure a vMAN, you create and configure a vman in software, and then you add ports to it. An untagged vman port represents a vMAN access port, and despite its name, an untagged vman port supports tagged and untagged VLAN frames. A tagged vman port represents a vMAN network port, and it only supports tagged vMAN frames. A vMAN supports two tags in each Ethernet frame, instead of the single tag supported by a VLAN Ethernet frame. The inner tag is referred to as the customer tag (C-tag), and this optional tag is based on the VLAN tag if the source VLAN is a tagged VLAN. The outer tag is referred to as the service tag (S-tag) or vMAN tag, and it is the tag that is used to switch the frame through the vMAN. Figure 97 shows the frame manipulation that occurs at the access switch for a vMAN. MAC DA MAC SA VLAN tag or C-tag (optional) L2 PDU Untagged port 1.1 VMAN 1 VMAN 2 Tagged port 2.1 MAC DA MAC SA S-tag (32 b, expected) VLAN tag or C-tag (optional) L2 PDU 1.2 2.2 Untagged port Figure 97. Tag Usage at the vMAN Access Switch Tagged port EX_vman_0037 781
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