CN111343040B

CN111343040B - Port expander stacking and splitting detection method and device for expansion network bridge

Info

Publication number: CN111343040B
Application number: CN202010054427.5A
Authority: CN
Inventors: 徐昶
Original assignee: New H3C Security Technologies Co Ltd
Current assignee: New H3C Security Technologies Co Ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2022-12-16
Anticipated expiration: 2040-01-17
Also published as: CN111343040A

Abstract

The application provides a method and a device for detecting the stacking and splitting of port expanders of an extended network bridge, wherein in the method, each port expander sends a link layer discovery protocol message with local splitting detection information through a local port so that other port expanders in the extended network bridge execute the stacking and splitting detection according to the local splitting detection information; receiving a link layer discovery protocol message with other equipment split detection information through each local port; stack-split detection between port expanders within the expansion bridge is performed based on each other device-split detection information received. The method and the device can enable the port expander of the expansion bridge to detect whether the stacking system formed by each port expander in the expansion bridge is subjected to stacking splitting or not through the LLDP under the condition that protocol messages such as LACP (Link aggregation protocol), ARP (Address resolution protocol), BFD (bidirectional Forwarding detection) and the like cannot be received and transmitted.

Description

Port expander stacking and splitting detection method and device for expansion network bridge

Technical Field

The invention relates to the technical field of communication, in particular to a port expander stacking splitting detection method and device for an expanded bridge.

Background

An Extended Bridge (Extended Bridge) is composed of a Control Bridge (CB) and a Port Extender (PE).

In the extended bridge, a virtual device stacked by a plurality of CBs is a primary stacking device; the virtual device stacked by the PEs is a secondary stacked device.

And the CB equipment controls the message forwarding of the extended network bridge system and the exit port of the message leaving the extended network bridge. In the uplink forwarding direction, after receiving the message, the PE device adds an ingress port identifier and then sends the message to the CB device through the cascade port, and the CB determines how to perform forwarding processing. In the downlink forwarding direction, the CB determines that the message leaves an output port of the extended network bridge, adds an output port identifier and sends the message to the PE equipment through a cascade port; the PE equipment determines an exit port through the exit port identification of the message, and then sends the message with the exit port identification stripped through the exit port.

Since the PE device does not need to compute and maintain forwarding entries, the extended bridge may be framed by a thin PE with 64k or 128k memory. However, since the thin PE has a small memory, there are not sufficient storage resources to support the CPU to run protocols such as LACP protocol, ARP protocol, BFD, etc. When stacking is performed between PE devices of the extended bridge, stacking split detection cannot be realized because the PE devices cannot receive and transmit protocol messages such as LACP protocol, ARP protocol, BFD, and the like.

Disclosure of Invention

The invention aims to provide a port expander stacking splitting detection method and a port expander stacking splitting detection device for an extended bridge, which are used for detecting whether each stacking system formed by a port expander in the extended bridge is split or not through LLDP.

To achieve the above object, the present application provides a port expander stack splitting detection method for an extended bridge, wherein the method includes: each port expander sends a link layer discovery protocol message with local splitting detection information through a local port so that other port expanders execute stacking splitting detection among port expanders in the expansion network bridge according to the local splitting detection information; receiving a link layer discovery protocol message with other equipment split detection information through each local port; stack-split detection between port expanders within the expansion bridge is performed based on each other device-split detection information received.

In order to achieve the above object, the present application provides a stack splitting detection apparatus applied to a port expander of an expansion bridge, wherein the apparatus includes: a sending module, configured to send a link layer discovery protocol packet with local splitting detection information through a local port, so that other devices perform stacking splitting detection between port extenders in an extended bridge according to the local splitting detection information; the receiving module is used for receiving the link layer discovery protocol message with the other equipment splitting detection information through each local port; a detection module to perform stack-split detection between port expanders within the expansion bridge according to each other device-split detection information received.

The beneficial effect of the above scheme of the application is that the port expander of the extended bridge detects whether the stacking system formed by each port expander is subjected to stacking splitting or not through the LLDP protocol message received and transmitted in the extended system under the condition that the port expander cannot receive and transmit protocol messages such as LACP protocol, ARP protocol, BFD protocol and the like.

Drawings

FIG. 1 is a flow diagram of a method for port expander stack split detection for an extended bridge;

fig. 2 is a schematic diagram of an extended bridge according to an embodiment of the present application;

FIG. 3 is a schematic diagram of stack splitting detection information provided by an embodiment of the present application;

fig. 4 is a schematic diagram illustrating a port expander stack splitting of an expansion bridge according to an embodiment of the present application;

FIG. 5 is a schematic view of a port expander with a stacked fragmentation detection device as provided herein;

fig. 6 is a schematic diagram of a port expander according to an embodiment of the present application.

Detailed Description

A detailed description will be given of a number of examples shown in a number of figures. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the examples.

The term "including" as that term is used is meant to include, but is not limited to; the term "comprising" means including but not limited to; the terms "above," "within," and "below" include the instant numbers; the terms "greater than" and "less than" mean that the number is not included. The term "based on" means based on at least a portion thereof.

As shown in fig. 1, the method for detecting the port expander stack split of the extended bridge provided by the present application includes the following steps:

step 101, each port expander sends a link group discovery protocol LLDP message with local split detection information through a local port.

Each port expander transmits the LLDP of the local splitting detection information so that other port expanders execute the stacking splitting detection between the port expanders in the expansion bridge according to the local splitting detection information;

and 102, each port expander receives the LLDP message with the splitting detection information of other equipment through each local port.

And 103, each port expander executes the stacking splitting detection between the port expanders in the expansion bridge according to the received splitting detection information of each other device.

In the embodiment shown in fig. 2, the extension bridge is a two-stack system, namely, a stack system consisting of CB21 and CB22, namely, CB stack 20; PE31, PE32, PE41, and PE42 constitute a stacking system, i.e., PE stack 50. Two terminals are connected to PE31, PE32, PE41, and PE42, respectively, to thereby multi-homed access the extended bridge.

The member devices CB21 and CB22 of the stacking system 20 are connected through the topology of the stacking link forwarding stacking protocol packet collection stacking system 20 shown in fig. 2, and elect the CB21 as the main device of the stacking system 20. Similarly, the member devices PE31, PE32, PE41 and PE42 of the stacking system 50 forward the topology connection of the stacking protocol message collecting stacking system 50 through the stacking link shown in fig. 2, and elect that PE31 is the main device of the stacking system 50.

The LLDP protocol is transceived between CB21 and CB22 via an interconnect link (not shown in fig. 2) other than the stacking link. Two-to-two interconnected links (not shown in fig. 2) between PE31 and PE32 receive and transmit LLDP protocol messages, PE31 and PE33 receive and transmit LLDP protocol messages through two-to-two interconnected links (not shown in fig. 2), and PE31 and PE34 receive and transmit LLDP protocol messages through two-to-two interconnected links (not shown in fig. 2). Similarly, the LLDP protocol packets are also sent between PE32, PE41, and PE42 via two interconnect links (shown in fig. 2) other than the stacking link.

The cascade ports (not shown in fig. 2) of the CBs 21, 22 and the upstream ports (not shown in fig. 2) of the

PEs

31, 32, 41, 42 are interconnected by links shown in fig. 2. The CB21 and the CB22 mutually transmit and receive LLDP protocol messages with the PE31, the PE32, the PE41 and the PE42 so that the CB21 and the CB22 discover the PE31, the PE32, the PE41 and the PE42, and the PEs are on-line and added into the expansion bridge.

As shown in fig. 3, an LLDPDU (Link Layer Discovery Protocol Data Unit) of an LLDP Protocol packet sent by each device includes TLV60.

As shown in fig. 3, the TLV type field (7 bits) of the TLV60 is set to 126, so as to indicate that the TLV60 is an LLDP MAD (multi active detection) for carrying the split detection information. A TLV Length field (9 bit) set to 5 to indicate that the actual total Length of the TLV Value extension field of the TLV60 is 5bytes. The TLV Value field (5 bytes) contains: a stacking system identification of 4bytes and a master device identification of 1byte. Wherein the value range of the stack system identification is 0-4294967295; the value range of the main equipment identification is 0-10, and the length is 1byte.

In the LLDP protocol sent by the member devices CB21 and CB22 of the CB stack 20, the stack system identifier in the TLV is 20, and the main device identifier is the device identifier of the CB 21. In the LLDP protocol issued by PE31, PE32, PE41, and PE42 of the PE stack 50, the stack system identifier in the TLV is 50, and the master device identifier is the device identifier of PE 31. In the present application, the member devices CB21 and CB22 of the CB stack 20 have sufficient memory, so that the running LACP protocol, ARP protocol, and BFD protocol can be used to detect whether the CB stack 20 is split.

The member devices PE31, PE32, PE41 and PE42 of the PE stack 50 receive the LLDP protocol packet sent from the CB21 or CB22, and read the split detection information according to the field value 126 of the TLV type of the TLV 60; comparing the stack system identification 20 of the LLDP protocol of the received CB21 or CB22 with the local stack system identification 50 identifies that the received split detection information belongs to a different port expander stack.

PE31 receives LLDP protocol message sent by PE42, reads the split detection information according to field value 126 of TLV type of TLV 60; comparing the stacking system identifier 50 of the received LLDP protocol with the local stacking system identifier 50, recognizing that the received stacking system identifier 50 is consistent with the local stacking system identifier 50, and comparing the received master device identifier with the local master device identifier; it is determined that the stacked PE50 is not split.

PE32, PE41, and PE42 receive the LLDP protocol messages sent by other member devices of stacking PE50 and process the same, and determine that stacking PE50 is not split.

Fig. 4 is a schematic diagram of a port expander stack splitting of an expansion bridge according to an embodiment of the present application. In fig. 4, the PE stack 50 is sorted. PE31 and PE32 forward the topology connection of the stacking protocol message collection stacking system 50 through the stacking link, and elect PE31 as the main device of the split stacking system 50. PE41 and PE42 forward the stacking protocol message through the stacking link to collect the topology connection of the new stacking system 51, and elect PE41 as the master device of the stacking system 51.

In the LLDP protocol sent by the PE31 and PE32 as member devices of the PE stack 50, the stack system identifier in the TLV is 50, and the master device identifier is the device identifier of the PE 31. In the LLDP protocol sent by PE41 and PE42 as member devices of PE stack 51, the stack system identifier in the TLV is 50, and the master device identifier is the device identifier of PE 41.

PE31 receives the LLDP protocol message sent by PE32, and reads the split detection information according to the field value 126 of the TLV type of TLV 60; comparing the stacking system identifier 50 of the received LLDP protocol with the local stacking system identifier 50, recognizing that the received stacking system identifier 50 is consistent with the local stacking system identifier 50, and comparing the received master device identifier with the local master device identifier; it is determined that the stacked PE50 is not split.

PE32 receives the LLDP protocol message sent by PE31, and reads the split detection information according to the field value 126 of the TLV type of TLV 60; comparing the stacking system identifier 50 of the received LLDP protocol with the local stacking system identifier 50, recognizing that the received stacking system identifier 50 is consistent with the local stacking system identifier 50, and comparing the received master device identifier with the local master device identifier; it is determined that stacked PE50 is not split.

PE31 receives the LLDP protocol message sent by PE41, and reads the split detection information according to the field value 126 of the TLV type of TLV 60; comparing the stacking system identifier 50 of the received LLDP protocol with the local stacking system identifier 50, recognizing that the received stacking system identifier 50 is identical to the local stacking system identifier 50, and comparing the received master device identifier PE41 with the local master device identifier PE31; recognizing that the received master id is inconsistent with the local master id, comparing the priority of the received master id PE41 with the priority of the local master id PE31, determining that the local master id PE31 has a higher priority (e.g., configured device id has a higher priority, or device id is minimum, or device id is maximum), and keeping the local port open. PE32 receives the LLDP protocol packet sent by PE41, and the method of detecting whether stacking is split is the same as PE31, and PE32 determines that the priority of the local master identifier PE31 is higher, and PE32 also keeps the local port open.

PE41 receives the LLDP protocol message sent by PE31, and reads the split detection information according to the field value 126 of the TLV type of TLV 60; comparing the stacking system identifier 50 of the received LLDP protocol with the local stacking system identifier 50, recognizing that the received stacking system identifier 50 is consistent with the local stacking system identifier 50, and comparing the received master device identifier PE31 with the local master device identifier PE41; recognizing that the received main device identifier is inconsistent with the local main device identifier, comparing the priority of the received main device identifier PE31 with the priority of the local main device identifier PE41, determining that the priority of the local main device identifier PE41 is low, and closing the local port.

In the systems shown in fig. 2 and 3, the local ports of the PE include an expansion port connected to a terminal and an upstream port connected to a CB device.

The two terminals can also access the extended bridge through the multi-homing of the PE31 and the PE32, send the uplink data message and the protocol message through the PE31 and the PE32, and receive the downlink data message and the protocol message through the PE31 and the PE 32.

The embodiments shown in fig. 2 to fig. 4 have the advantages that, when the port expander cannot transmit and receive protocol messages such as LACP protocol, ARP protocol, BFD protocol, etc., the port expander detects whether stack splitting occurs in a stack system formed by each port expander through LLDP protocol messages transmitted and received in the expansion system, and thus the software processing load of the port expander is not increased.

Fig. 5 is a schematic diagram of a device 60 with a stack fragmentation detection provided herein, the device 60 expanding a port expander of a bridge. As shown in fig. 6, the apparatus includes: a receiving module 61, a sending module 62, a detecting module 63 and a port management module 64.

A sending module 61, configured to send the link layer discovery protocol packet with the local splitting detection information through the local port, so that other devices perform stack splitting detection between port expanders in the expansion bridge according to the local splitting detection information. A receiving module 62, configured to receive, through each local port, a link layer discovery protocol packet with other device split detection information. A detection module 63 for performing stack-split detection between port expanders within the expansion bridge based on each other device-split detection information received.

The detecting module 63 is further configured to compare the stacking system identifier carried in the received other device splitting detection information with the stacking system identifier of the local splitting detection information, identify that the received stacking system identifier is inconsistent with the local stacking system identifier, and determine that the received other device splitting detection information belongs to another stacking system.

The detection module 63 is further configured to compare the stacking system identifier of the received other device splitting detection information carried by the stacking system identifier with the local splitting detection information; identifying that the received stacking system identification is consistent with the local stacking system identification, and comparing the received main equipment identification with the local main equipment identification; and identifying that the received main equipment identification is consistent with the local main equipment identification, and determining that the port expander stack is not split.

The detection module 63 is further configured to compare the received stacking system identifier carried by the other device splitting detection information with the stacking system identifier of the local splitting detection information; identifying that the received stacking system identification is consistent with the local stacking system identification, and comparing the received main equipment identification carried by the splitting detection information of other equipment with the main equipment identification of the local splitting detection information; recognizing the received main equipment identification is inconsistent with the local main equipment identification, comparing the priority of the main equipment identification carried by the splitting detection information of other equipment with the priority of the main equipment identification of the local splitting detection information, and informing a port management module of the comparison result

The port management module 64 is configured to close the local port when the received comparison result indicates that the priority of the master device identifier carried by the splitting detection information of the other device is high; and the local port is kept open when the received comparison result shows that the priority of the main equipment identification of the local splitting detection information is high.

Fig. 6 is a schematic diagram of a port expander 70 provided in an embodiment of the present application, where the port expander 70 includes a processor, a memory, and a switch chip.

Wherein, the memory, the processor and the exchange chip are connected through a bus.

The memory is used for storing programs, and the processor calls the programs stored in the memory to execute the method embodiments of fig. 2 to 4. The specific implementation and technical effects are similar, and are not described herein again.

Optionally, the present application also provides a program product, such as a computer readable storage medium, comprising a program which, when being executed by a processor, is adapted to carry out the above-mentioned method embodiments.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for detecting port expander stack splitting of an extended bridge,

each port expander sends a link layer discovery protocol message with local splitting detection information through a local port so that other equipment executes stacking splitting detection among the port expanders in the expansion network bridge according to the local splitting detection information;

receiving a link layer discovery protocol message with other equipment split detection information through each local port;

performing stack-split detection between port expanders within the expansion bridge according to the received split detection information for each other device; wherein performing stack-split detection between port expanders within the expansion bridge based on the received per-other-device-split detection information comprises:

comparing the stacking system identification carried by the received other equipment splitting detection information with the stacking system identification of the local splitting detection information;

if the received information is inconsistent with the received information, the received information of the other equipment splitting detection belongs to other stacking systems;

when the received split detection information of the other devices is consistent with the received split detection information of the local device, comparing the main device identification carried by the split detection information of the other devices with the main device identification of the local split detection information;

and when the main equipment identification carried by the received other equipment splitting detection information is consistent with the main equipment identification of the local splitting detection information, determining that the port expander stack is not split.

2. The method of claim 1, wherein performing stack-split detection between port expanders within an expansion bridge based on each other device-split detection information received comprises:

when the main device identification carried by the received other device splitting detection information is inconsistent with the main device identification of the local splitting detection information, comparing the priority of the main device identification carried by the received other device splitting detection information with the priority of the main device identification of the local splitting detection information;

when the priority of the main equipment identification carried by the received other equipment splitting detection information is high, closing the local port; or when the priority of the main equipment identifier of the local splitting detection information is high, keeping a local port open.

3. A stack splitting detection device applied to a port expander of an expansion bridge,

a sending module, configured to send a link layer discovery protocol packet with local splitting detection information through a local port, so that other devices execute stacking splitting detection between port expanders in an expansion bridge according to the local splitting detection information;

the receiving module is used for receiving the link layer discovery protocol message with the other equipment splitting detection information through each local port;

a detection module for performing stack-split detection between port expanders within the expansion bridge according to the received split detection information for each other device; the device comprises a receiving module, a judging module and a judging module, wherein the receiving module is used for receiving other device splitting detection information, comparing a stacking system identifier carried by the received other device splitting detection information with a stacking system identifier of the local splitting detection information, identifying that the stacking system identifier carried by the received other device splitting detection information is not consistent with the stacking system identifier of the local splitting detection information, and determining that the received other device splitting detection information belongs to other stacking systems; and identifying that the main equipment identification carried by the received other equipment splitting detection information is consistent with the main equipment identification of the local splitting detection information, and determining that the port expander stack is not split.

4. The apparatus of claim 3, further comprising: a port management module;

the detection module is configured to identify that a master device identifier carried by the received other device splitting detection information is inconsistent with a master device identifier of the local splitting detection information, compare the priority of the master device identifier carried by the received other device splitting detection information with the priority of the master device identifier of the local splitting detection information, and notify the port management module of the comparison result;

the port management module is used for closing the local port when the received comparison result shows that the priority of the main equipment identifier carried by the received other equipment splitting detection information is high; and the local port is kept open when the received comparison result shows that the priority of the main equipment identifier of the local splitting detection information is high.

5. A storage medium having stored thereon a computer program which, when read and executed, implements a method for port extender stack split detection for an extended bridge as claimed in any of claims 1-2.

6. A network device, comprising: wherein the network device comprises a machine-readable storage medium having stored thereon machine-executable instructions and a processor that, when executed, implements the method of any of claims 1-2.