The OSN3500 SSN5EFS0 single board is an Ethernet switching processing board, which is mainly used to solve the telecommunication application areas such as Ethernet service access, bandwidth management and Layer 2 switching of Ethernet services.The board supports Layer 2 switching, MPLS, multicast, and other functions and features.The EFS0 board has four functional versions, N1, N2, N4, and N5, andthe N1EFS0,N2EFS0, and N4EFS0 boards have been discontinued.Use with ETF8 to support 10Base-T/100Base-TX and meet IEEE 802.3u standard.Work with ETF8 to realize 8-channel FE telecom signal access.Support 100Base-FX/LX/VX/ZX in conjunction with EFF8 to meet IEEE 802.3u standard.Work with EFF8 to realize 8-channel FE optical signal access. Work with ETS8 and TSB8 to realize 8-channel FE electrical signal TPS protection.SSN5EFS0 can also work with ETF8A to realize 8-channel FE electrical signal access.
Problem Description

A bureau uses Huawei S5700 switches to configure one-to-many aggregation services with the N5EFS0 single board of the transmission OSN3500. The S5700 side is a trunk port, and the default VLAN ID of the port is 1. Feedback from the switch side indicates that except for the VLAN ID 1 that is not passable, the other VLANs can be passed normally.

Processing

1, other VLANs can communicate normally, you can rule out the problem of the binding channel on the transmission side, check the configuration of the converged Ethernet LAN service as 802.1Q, check the VLAN consideration table, there is a VLAN1 consideration table, the settings are normal, check the access-side Ethernet leased line service, the configuration of the port exclusivity, all the VLANs can be passed, the settings are normal.

2. check the TAG attributes of the internal and external ports of the transmission aggregation station A, and the TAG attributes of the internal and external ports of the access side stations B, C, and D. Data frames carrying VLAN tags can pass through the transmission TAG attribute ports normally, and frames not carrying VLAN tags will be discarded.

3, and the switch side to confirm that the switch-side port for the trunk side (i.e., TAG attribute), the port's PVID is 1, trunk port sends a message: compare the port's PVID and the VLAN information of the message to be sent, if the two are equal, then strip the VLAN information, and then send it again, if not equal, then send it directly. Because the PVID of the port and the VLAN of the sent message are both 1, the sent message with VLAN of 1 strips the VLAN information and does not carry VLAN, but frames without VLAN tags in the TAG attribute on the transport side are discarded and therefore do not pass.

4. After the TAG attributes of the internal and external ports of the aggregation site (station A) and the access sites (B, C, and D) of transmission are all changed to HyBrid and the default VLAN ID is set to 1, the switch communicates normally.

Cause of failure

The switch-side port attribute is trunk port, the PVID of the port and the VLAN of the outgoing message are both 1. The outgoing message VLAN is 1 stripped of VLAN information and does not carry VLAN, but the frames with the transmission-side TAG attribute not carrying VLAN tags are dropped and therefore do not go through.

Solution

1. On the transmission side, set the TAG attributes of both internal and external ports to HyBrid, with the default VLAN ID of 1, and passthrough the data of the switch with and without VLANs.

2. The switch side sets the PVID of the port to be inconsistent with the service VLAN to ensure that the outgoing messages all carry VLAN ID.

Recommendation and Summary

I. Switch interface in/out data processing process:

1. Acess port receives telegrams .

Receive a message , determine whether there is VLAN information: if not, then hit the PVID of the port and exchange and forward , if there is, then directly discarded (default).

2、Acess port sends a message:

Strip the VLAN information from the message and send it out directly

3、Receive the message on trunk port:

Receive a message, determine whether there is VLAN information: if not, type the PVID of the port and exchange and forward it, if so, determine whether the trunk port allows the data of the VLAN to enter: if so, forward it, otherwise discard it.

4、trunk port sends a message:

Compare the PVID of the port and the VLAN information of the message to be sent, if they are equal then strip the VLAN information and send it again, if not then send it directly.

5、hybrid port receive message:

Receive a message , determine whether there is VLAN information: if not, then type the PVID of the port, and exchange and forward, if there is, then determine whether the hybrid port allows the data of the VLAN to enter: if it can, then forward, otherwise discard (at this time, do not take into account the un-tag configuration of the port, the un-tag configuration is only useful for sending the message ).

6. hybrid port sends a message:

1. Determine the attributes of the VLAN on the port ( disp interface that is, you can see which VLANs are untagged and which VLANs are tagged on the port).

If it is untag, then strip the VLAN information and send it again, if it is tag, then send it directly.

Second, transmission side port TAG data processing:

1. Acess port receives telegrams.

receives a packet, determines whether there is VLAN information: if not, it hits the port default VLAN and forwards it, if so, it is directly discarded.

2. Acess port sends a message:

Strip the VLAN information from the message and send it out directly.

3. The TAG port receives the message:

Receive a message and determine whether there is VLAN information: if not, discard it, if so, pass it through.

4. TAG port sends a message: it is transmitted directly.

5、hybrid port receives telegrams:

Frames carrying VLAN tags are transmitted directly. Frames not carrying VLAN tags are forwarded with the port's default VLAN.

6. hybrid port sends the message:

If the VLAN ID in the data frame is "Default VLAN ID", strip the VLAN tag and send it.

If the VLAN ID in the data frame is not the "Default VLAN ID", pass through.

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