Netgear XCM8810 Chassis User Manual - Page 782
vMAN Configuration Options and Features, MAC SA 48b
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Chapter 30. vMAN (PBN) 8800 Chassis Switch In Figure 97, the switch accepts all tagged (C-tag) and untagged VLAN frames on vMAN access ports 1.1 and 1.2. The switch then adds the S-tag to the frames and switches the frames to network ports 2.1 and 2.2. When the 802.1ad frames reach the PB egress port, the egress switch removes the S-tag, and the VLAN traffic exits the egress access port in its original form. When the switch in Figure 97 acts as the egress switch for a vMAN, vMAN frames arrive on network ports 2.1 and 2.2. The switch accepts only those frames with the correct S-tag, removes the S-tags, and switches those frames to access ports 1.1 and 1.2. Unless special configuration options are applied, the egress frames are identical to ingress frames of the vMAN. (Configuration options are described in vMAN Configuration Options and Features on page 782.) Figure 98 shows that the S-tags and C-tags used in vMAN frames contain more than just customer and service VLAN tags. S-ethertype (16b) MAC DA (48b) MAC SA (48b) S-COS (4b) SVID (12b) vMAN tag or S-tag (32b, optional) VLAN tag or C-tag (32b, optional) L2 PDU: if IP packet, it may include TOS / Diffserv-Codepoint field C-ethertype (16b) C-COS (4b) CVID (12b) Figure 98. S-tag and C-tag Components EX_vman_0036 Each S-tag and C-tag contains an ethertype, a Class of Service (COS), and a VLAN ID. The ethertype is described in Secondary Ethertype Support on page 783, and the COS is described in QoS Support on page 784. The service VLAN ID (SVID) is the VLAN tag you assign to a vMAN when you create it (configure vman tag ). The customer VLAN ID (CVID) represents the customer VLAN tag for tagged VLAN traffic. The service provider configures the vMAN to support the customer traffic. The vMAN service provider does not need to know anything about the VLAN traffic in the vMAN. The service provider simply manages the vMAN, and the ingress VLAN traffic is managed by the customer or another service provider. This separation of VLAN and vMAN management reduces the dependence of the separate management teams on each other, and allows both management teams to make changes independent of the other. vMAN Configuration Options and Features This section describes the following vMAN (PBN) configuration options and features: 782
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