Chinese
English
I. Huawei Optix Metro1000 EPL service
Figure 1 EPL service
Table 1 Correspondence between external ports and VCTRUNK (EPL service)
| NE1 | NE2 | ||
|---|---|---|---|
| User A1 | PORT1←→VCTRUNK1 | VCTRUNK1←→PORT1 | VCTRUNK1←→PORT1 |
| PORT1←→VCTRUNK1 VCTRUNK1←→PORT1 | PORT2←→VCTRUNK2 | VCTRUNK2←→PORT2 | User B2 |
- EVPL services that share external ports.
Table 2 Correspondence between external port and VCTRUNK (EVPL service with shared external port)
| NE1 | NE2 | ||
|---|---|---|---|
| User C1 | PORT1←→VCTRUNK1 | VCTRUNK1←→PORT1 | User C2 |
| PORT1←→VCTRUNK2 | VCTRUNK2←→PORT2 | User C3 | |
- Share the EVPL services of VCTRUNK. The Ethernet single board supports the following three ways to realize the aggregation and distribution of EVPL services.
- EVPL services implemented based on VLAN tagging.
- EVPL services implemented based on MPLS encapsulation.
- EVPL service realized based on QinQ technology.
Table 3 Correspondence between external ports and VCTRUNK (EVPL service with shared VCTRUNK)
| NE1 | NE2 | ||
|---|---|---|---|
| User D1 | PORT1←→VCTRUNK1 | VCTRUNK1←→PORT1 | VCTRUNK1←→PORT1 |
| PORT1←→VCTRUNK1 VCTRUNK1←→PORT1 | PORT2←→VCTRUNK1 | VCTRUNK1←→PORT2 | User E2 |
Figure 4 EPLAN service (IEEE 802.1d bridge)
IV. Huawei Optix Metro1000 EVPLAN service
Figure 5 EVPLAN service (IEEE 802.1q bridge)
- The contents of VLAN tags are not checked for data frames entering the bridge, and Layer 2 switching is performed based on the destination MAC address of the data frame.
- VLAN tag content is checked for data frames entering the bridge, and Layer 2 switching is performed based on the destination MAC address and the S-VLAN ID carried by the data frame.
Huawei MSTP devices follow the ITU-T G.8011x/Y.1307x recommendations and support EPL (Ethernet Private Line) services, EVPL (Ethernet Virtual Private Line) services, EPLAN (Ethernet Private Local Area Network) services, and S-VLAN services. Private Local Area Network) service and EVPLAN (Ethernet Virtual Private LAN) service.
The EPL service has two service access points and realizes point-to-point transparent transmission of Ethernet services to subscribers. A user occupies a VCTRUNK exclusively and does not need to share the bandwidth with other users, so it has strict bandwidth guarantee and user isolation, and does not need to adopt other QoS mechanisms and security mechanisms.
The correspondence between external ports and VCTRUNK is shown in Table 1.
The main difference between EVPL service and EPL service is that multiple users need to share the bandwidth, so it is necessary to use VLAN/MPLS/QinQ mechanism to distinguish different user data. If different quality of service needs to be provided to different users, the corresponding QoS mechanism needs to be used. According to the different ways of occupying resources by users, they can be divided into two categories.
As shown in Figure 2, multiple user services accessed from the same external port at a site realize user data isolation through different VLAN IDs, occupying different VCTRUNKs for transmission to different external ports at the same site.
The correspondence between external ports and VCTRUNKs is shown in Table 2.
As shown in Figure 3, different user data isolation is realized through the VLAN/MPLS/QinQ mechanism, and multiple user services are transmitted in one VCTRUNK channel.
The correspondence between external ports and VCTRUNK is shown in Table 3.
The EPLAN service has at least two service access points. Different users do not need to share the bandwidth, so it has strict bandwidth guarantee and user isolation, and does not need to use other QoS mechanisms and security mechanisms. Since it has multiple nodes, it needs to learn MAC addresses and forward data based on MAC addresses to realize Layer 2 switching.
As shown in Figure 4, three divisions of user F need to communicate, and NE1 establishes an IEEE 802.1d bridge to realize the EPLAN service. the IEEE 802.1d bridge can establish a forwarding table based on the MAC (Media Access Control) address, and this table is updated periodically by the system self-learning function. Accessed data can be forwarded or broadcasted within the IEEE 802.1d bridge domain according to its destination MAC address.
The main difference between EVPLAN service and EPLAN service is that multiple users need to share the bandwidth. Therefore, it is necessary to use the VLAN/MPLS/QinQ mechanism to distinguish the data of different users. If different quality of service needs to be provided to different users, corresponding QoS mechanisms need to be used.
As shown in Figure 5, the three divisions of user G need to communicate, the three divisions of user H need to communicate, and the services of user G and user H need to be data segregated. NE1 is required to establish an IEEE 802.1q bridge to realize EVPLAN services.
IEEE 802.1q bridge: It supports one layer of VLAN tagged data isolation. Data frames entering the bridge are checked for the contents of VLAN tags, and Layer 2 switching is performed based on the destination MAC address and the VLAN ID carried by the data frame.
As shown in Figure 6, the VoIP service and HSI service of subscriber M and subscriber N need to be accessed to the VoIP server and the HSI server, respectively, and the operator needs to schedule and realize data isolation for the VoIP service and the HSI service separately on the transmission network side. NE1 is required to establish an IEEE 802.1ad bridge to realize EVPLAN service.
IEEE 802.1ad bridge: It supports two-layer VLAN-tagged data frames, adopts the outer S-VLAN for VLAN isolation, and supports only the ports with the hooked port attributes of C-Aware and S-Aware. The bridge supports the following two switching modes.
