схема базы данных Open_vSwitch (Open_vSwitch database schema)
AutoAttach TABLE
Auto Attach configuration within a bridge. The IETF Auto-Attach
SPBM draft standard describes a compact method of using IEEE
802.1AB Link Layer Discovery Protocol (LLDP) together with a IEEE
802.1aq Shortest Path Bridging (SPB) network to automatically
attach network devices to individual services in a SPB network.
The intent here is to allow network applications and devices
using OVS to be able to easily take advantage of features offered
by industry standard SPB networks.
Auto Attach (AA) uses LLDP to communicate between a directly
connected Auto Attach Client (AAC) and Auto Attach Server (AAS).
The LLDP protocol is extended to add two new Type-Length-Value
tuples (TLVs). The first new TLV supports the ongoing discovery
of directly connected AA correspondents. Auto Attach operates by
regularly transmitting AA discovery TLVs between the AA client
and AA server. By exchanging these discovery messages, both the
AAC and AAS learn the system name and system description of their
peer. In the OVS context, OVS operates as the AA client and the
AA server resides on a switch at the edge of the SPB network.
Once AA discovery has been completed the AAC then uses the second
new TLV to deliver identifier mappings from the AAC to the AAS. A
primary feature of Auto Attach is to facilitate the mapping of
VLANs defined outside the SPB network onto service ids (ISIDs)
defined within the SPM network. By doing so individual external
VLANs can be mapped onto specific SPB network services. These
VLAN id to ISID mappings can be configured and managed locally
using new options added to the ovs-vsctl command.
The Auto Attach OVS feature does not provide a full
implementation of the LLDP protocol. Support for the mandatory
TLVs as defined by the LLDP standard and support for the AA TLV
extensions is provided. LLDP protocol support in OVS can be
enabled or disabled on a port by port basis. LLDP support is
disabled by default.
Summary:
system_name string
system_description string
mappings map of integer-integer pairs, key
in range 0 to 16,777,215, value in
range 0 to 4,095
Details:
system_name: string
The system_name string is exported in LLDP messages. It
should uniquely identify the bridge in the network.
system_description: string
The system_description string is exported in LLDP
messages. It should describe the type of software and
hardware.
mappings: map of integer-integer pairs, key in range 0 to
16,777,215, value in range 0 to 4,095
A mapping from SPB network Individual Service Identifier
(ISID) to VLAN id.
