H3C S10500 Series Configuration Manual

Also see for S10500 Series: Mpls configuration guide Installation guide Interface configuration guide Configuration guide Command reference

Contents

H3C S10500 Series Configuration Manual Manual pdf 9 page image

2Basic conceptsFigure 2 shows the components on the EVB station and EVB bridge.Figure 2 EVB architecture• Edge Relay—An ER transfers packets between one URP and one or more DRPs. An ER hasone or more DRPs and one URP. Both URP and DRPs are called ER ports. An EVB station canhave multiple ERs.• S-channel—A point-to-point S-VLAN established between a Port-mapping S-VLAN componentin an EVB station and a Port-mapping S-VLAN component in an EVB bridge. An S-channelcorresponds to the URP of an ER. On an EVB bridge, the end point of an S-channel is known asan S-channel interface. An S-channel is identified by the S-VLAN Identifier (SVID) and theS-channel Identifier (SCID), and the two values together are called an (SCID, SVID) pair.• Virtual Station Interface—A VSI is a port on a VM that directly connects to the DRP of an ER.A VSI is associated with a logical entity called VSI instance, which is identified by the VSIInstance Identifier (VSIID). A VSI is associated with a virtual interface called VSI interface onthe EVB bridge port to implement VM traffic management and policy configuration. A VSIinterface can be considered a subinterface of an S-channel.• Reflective Relay—RR is an operation mode in which a received frame on a port that supportsthis function can be forwarded out of the same port. The EVB bridge uses this mode to forwardtraffic among VMs on an EVB station, as shown in Figure 2.EVB working mechanismThe following basic concepts describe EVB station and EVB bridge communication:• S-channel Discovery and Configuration Protocol—CDCP is used to configure S-channelsbetween stations and bridges. When a station creates or deletes an S-channel, CDCP sends aCDCP TLV in an LLDP packet that is addressed using the nearest non-TPMR bridge address tothe bridge. The bridge creates or deletes the S-channel.• VSI Discovery and Configuration Protocol—VDP manages the association between a VSIand a station-facing bridge port (SBP) on a bridge. VDP uses the Edge Control Protocol (ECP)to carry VDP TLVs. A VDP TLV contains the VSIID, VSI type, and VSI version. The bridge usesthe VSI interfaces to manage traffic for VMs.• VSI manager—A VSI manager stores network policies such as VSI traffic management anddeploys the policies when a VM accesses the network.{ When a station creates a VM, it sends a VDP pre-associate, pre-associate with resourcereservation, or associate packet to the bridge. The bridge sends the request to a VSImanager, and the VSI manager notifies the bridge to create a VSI interface and applypolicies.