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The MAC sublayer and the logical link control (LLC) sublayer together make up the data link layer. The LLC provides flow control and multiplexing for the logical link (i.e. EtherType, 802.1Q VLAN tag etc), while the MAC provides flow control and multiplexing for the transmission medium. These two sublayers together correspond to layer 2 of the ...
IEEE 802.1Q, often referred to as Dot1q, is the networking standard that supports virtual local area networking (VLANs) on an IEEE 802.3 Ethernet network. The standard defines a system of VLAN tagging for Ethernet frames and the accompanying procedures to be used by bridges and switches in handling such frames.
VLANs operate at the data link layer of the OSI model. Administrators often configure a VLAN to map directly to an IP network, or subnet, which gives the appearance of involving the network layer. Generally, VLANs within the same organization will be assigned different non-overlapping network address ranges. This is not a requirement of VLANs.
Static configuration of VLAN membership information via management mechanisms, which allow configuration of static VLAN registration entries. Combined static and dynamic configuration, in which some VLANs are configured via management mechanisms and for other VLANs, MVRP is relied on to establish the configuration.
IEEE 802.1D is the Ethernet MAC bridges standard which includes bridging, Spanning Tree Protocol and others. It is standardized by the IEEE 802.1 working group. It includes details specific to linking many of the other 802 projects including the widely deployed 802.3 (Ethernet), 802.11 (Wireless LAN) and 802.16 (WiMax) standards.
Configuration Identifier Format Selector: Indicates the use which is going to be given to the following components. Configuration Name [3] [4] [5] Revision Level and the Configuration Digest: [6] [7] A 16B signature HMAC-MD5 Algorithms created from the MST Configuration Table. This object is specific and unique of MSTP, neither STP or RSTP use it.
However, switches en route still have to learn all inserted VLAN/MAC address combinations (12 + 48 = 60 bits). Broadcasts from LAN to LAN is always an issue to consider. Provider Bridges (802.1ad) and Provider Backbone Bridges (the IEEE 802.1ah-2008 standard) address the above problems by a further modified SAMAC learning method.
On Cisco Devices, VTP (VLAN Trunking Protocol) maintains VLAN configuration consistency across a single Layer 2 network. VTP uses Layer 2 frames to manage the addition, deletion, and renaming of VLANs from switches in the VTP client mode. VTP is responsible for synchronizing VLAN information within a VTP domain and reduces the need to configure ...