JP5550619B2 - QoS (Quality of Service) control apparatus and method - Google Patents

Description

  The present invention relates to a QoS control apparatus and method, and more particularly to a QoS control apparatus and method in a node system that configures an Ethernet (registered trademark) ring using a hierarchical VLAN technology or the like.

  Hierarchical VLAN technologies such as EEE802.1ad and IEEE802.1ah are technologies that multiplex user traffic using a hierarchical header in a layer 2 network and accommodate many users on physical lines (for example, Non-Patent Document 1). reference). VLAN technology is a technology that logically distinguishes lines by assigning VLAN tags to Ethernet frames. However, Customer VLAN (C-VLAN) for each user and Service VLAN (S-VLAN) that accommodates multiple C-VLANs. By logically constructing and hierarchically assigning C-VLAN tag and S-VLAN tag to Ethernet (registered trademark) frame, more users can be accommodated in the physical line.

  FIG. 1 shows a conventional QoS control method in a layer 2 ring node.

  In the layer 2 network using the above hierarchical VLAN technology, the user traffic with the C-VLAN tag and S-VLAN tag attached to the Ethernet (registered trademark) frame is the Ethernet (registered trademark) ring section of the layer 2 ring node. Is stored in the packet queue 3 for each C-VLAN deployed at the location that flows into the network, and is read by the fairness control unit 2 for each C-VLAN together with the traffic that has flowed through the Ethernet (registered trademark) ring line from other nodes. In this way, fairness between C-VLANs in the Ethernet (registered trademark) ring line is maintained. In this way, with the conventional technology, when performing fair traffic control between users, a packet queue is provided for each C-VLAN, and fair read control is performed for each queue to achieve fair traffic control between users. Was.

IEEE Std 802.1ad-2005: Local and metropolitan area networks-Virtual Bridged Local Area Networks-Amendment 4: Provider Bridges ・ IEEE Std 802.1ah-2008: Local and metropolitan area networks-Virtual Bridged Local Area Networks-Amendment 7: Provider Backbone Bridges

  However, in the conventional technology, it is necessary to maintain a queue for each C-VLAN and a read control function from each queue in a ring section in which user traffic is highly multiplexed, and the hardware configuration is complicated. It is.

  The present invention has been made in view of the above points, and solves the problems of these conventional techniques, and has a C-VLAN unit queue and a queue unit read control function in a ring section in which user traffic is highly multiplexed. Therefore, an object of the present invention is to provide a QoS control apparatus and method capable of realizing traffic fair control between users with simple hardware for all users with only S-VLAN unit queues.

In order to solve the above problems, the present invention (Claim 1) is a QoS control device that performs QoS control on a ring-type IEEE802.1ad or IEEE802.1ah hierarchical VLAN using Ethernet (registered trademark). And
Before the traffic flows into the ring line,
A means to perform traffic fair control in Customer VLAN (C-VLAN) units,
A means for performing traffic fair control in Service VLAN (S-VLAN) units is provided in the ring section.

In addition, the present invention (Claim 2 ) includes means for performing traffic fair control in which the traffic fair control in units of S-VLANs is applied with weighting according to the number of C-VLANs in the S-VLAN.

  According to the present invention, the queue is held in units of C-VLAN while performing bandwidth limitation in units of S-VLAN in the previous stage of flowing into the ring line, and fair read control for each queue is performed, so that S- By performing only traffic fair control on a VLAN basis, it is possible to control traffic configuration between users without maintaining a queue on a user basis in a link section where user traffic is highly multiplexed. Traffic fair control between users can be realized with simple hardware for all users.

It is a block diagram of the QoS control system of a prior art. It is a block diagram of the QoS control system in the 1st Embodiment of this invention. It is a block diagram of the QoS control system in the 2nd Embodiment of this invention. It is a comparison between the present invention and the prior art.

  Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment]
FIG. 2 is a configuration diagram of the QoS control system according to the first embodiment of the present invention. The layer 2 ring node 10 constituting the Ethernet (registered trademark) ring network adopts an Ethernet (registered trademark) line. Access line accommodation unit 11, queue 12, traffic fairness control unit 13 in units of C-VLAN, bandwidth limiter unit 14 in units of S-VLAN, and S-VLAN units in locations multiplexed on Ethernet (registered trademark) ring lines The fairness control unit 15 is provided.

  A fair control unit 13 that performs C-VLAN fair control and a bandwidth limit unit 14 that performs S-VLAN bandwidth limitation are provided in the previous stage of flowing into the Ethernet ring line (hierarchical VLAN) 30 to perform fair control of S-VLAN. The fairness control unit 15 to perform is provided in the ring.

  In the layer 2 ring node, the access line accommodation unit 11 accommodates the access line of the hierarchical VLAN, holds a queue 12 for each C-VLAN for each S-VLAN for the Ethernet (registered trademark) frame, and C-VAN The fair control unit 13 performs traffic fair control in units of C-VLAN for each S-VLAN by reading from each queue 12 by the round robin method. The subsequent S-VLAN bandwidth limiter 14 limits the bandwidth of each S-VLAN using the rate limit function that transfers at a constant rate, and transfers it to the Ethernet (registered trademark) ring section of the layer 2 ring node. . In the Ethernet (registered trademark) ring section, when multiplexing to the Ethernet (registered trademark) ring line 30, only the queue for each S-VLAN is held, and the S-VLAN fairness control unit 15 reads from each queue by the round robin method. By performing the traffic fair control only in units of S-VLAN, the traffic fair control including the units of C-VLAN is realized in the Ethernet (registered trademark) ring line 30.

  For example, in FIG. 2, assuming that the S-VLAN bandwidth limit of the S-VLAN bandwidth limiter 14 is 10 Gbps, the Ethernet (registered trademark) ring line bandwidth is 100 Gbps, and the Ethernet (registered trademark) ring line bandwidth is 100 Gbps. The 10Gbps traffic after bandwidth limitation in S-VLAN units maintains fairness in C-VLAN units. If traffic in the Ethernet (registered trademark) line is 100Gbps, fairness in units of S-VLANs and fairness in units of C-VLANs in each S-VLAN are already maintained. Occasionally, only fair control in units of S-VLANs is performed, so that fair control in units of S-VLANs is maintained while maintaining fair control in units of C-VLANs to some extent, and excess bandwidth of 10 Gbps is discarded.

[Second Embodiment]
In the present embodiment, an example will be described in which traffic fair control in units of S-VLANs is weighted by the number of C-VLANs.

  FIG. 3 shows the configuration of the QoS control system according to the second embodiment of the present invention. In the figure, the same components as those in FIG.

  In the layer 2 ring node 20 constituting the Ethernet (registered trademark) ring network, the access line collection unit 11, the queue 12, the traffic fairness control unit 13 in units of C-VLAN, and the bandwidth limit unit 14 in units of S-VLAN. And an S-VLAN unit fair control unit 25 to which weighting is applied in accordance with the number of C-VLANs in the S-VLAN at a location multiplexed on the Ethernet (registered trademark) ring line 40.

  In the layer 2 ring node 20, the access line accommodation unit 11 accommodates the access line of the hierarchical VLAN, holds a queue 12 for each C-VLAN for each S-VLAN for the Ethernet (registered trademark) frame, and traffic. The fair control unit 13 performs traffic fair control in units of C-VLANs. The bandwidth limiter 14 at the subsequent stage limits the bandwidth in units of S-VLAN and transfers it to the Ethernet (registered trademark) ring section of the layer 2 ring node 20.

  In the Ethernet (registered trademark) ring section, when multiplexing to the Ethernet (registered trademark) ring line 40, only the queue 16 in S-VLAN units is held, and the S-VLAN fair control unit 25 performs C-VLAN in the S-VLAN. Only traffic fair control for each S-VLAN with weighting according to the number applied.

  Thus, in the Ethernet (registered trademark) ring line 40, traffic fair control including C-VLAN units is realized without depending on the number of C-VLANs in the S-VLAN.

  For example, in FIG. 3, the number of C-VLANs in S-VLAN # 1 of queue 12 is 4, the number of C-VLANs in S-VLAN # 2 of queue 16 is 1, and the bandwidth limit for each S-VLAN is 10 Gbps. If the bandwidth of the Ethernet (registered trademark) ring line is 10 Gbps, and the bandwidth used of the Ethernet (registered trademark) ring line is 0 Gbps, the 10 Gbps traffic after bandwidth limitation in S-VLAN # 1 is in C-VLAN units. The fairness is maintained, and a maximum of 2.5 Gbps can be used for each C-VLAN. On the other hand, the traffic of 10 Gbps after bandwidth limitation in S-VLAN # 2 after S-VLAN unit is kept fair in C-VLAN unit, and the maximum 10 Gbps can be used in the corresponding C-VLAN. When multiplexing to an Ethernet (registered trademark) ring circuit, each C-VLAN in S-VLAN # 1 can be used up to 1.25 Gbps only by performing fair control in units of S-VLAN, and C in S-VLAN # 2 -VLANs can be used up to 5Gbps and fairness in C-VLAN units is not maintained, but S-VLAN fair control unit 25 uses S-VLAN # 1 as S-VLAN according to the number of C-VLANs in S-VLAN. By performing traffic fair control in units of S-VLAN with four times the weighting of VLAN # 2, each C-VLAN can be used up to 2 Gbps for both S-VLAN # 1 and S-VLAN # 2, and C-VLAN Unit fair control is maintained.

  As described above, in the QoS control method of this example, it is not necessary to maintain a queue for each C-VLAN and a read control function for each queue in a link section where user traffic is highly multiplexed. Traffic fair control in between is possible.

  As shown in FIG. 4, in the prior art, it is necessary to hold a queue for each C-VLAN. However, by using the present invention, a queue or queue for each C-VLAN is used in a link section where user traffic is highly multiplexed. Traffic fair control between users can be realized with simple hardware for all users with only queues in S-VLAN units without having a unit-by-unit read control function.

  The present invention is not limited to the above-described embodiment, and various modifications and applications can be made within the scope of the claims.

1 All VLAN configuration control units 10 and 20 Layer 2 ring node 11 Access line accommodation unit 12 Queue 13 C-VLAN fair control unit 14 S-VLAN bandwidth limit unit 15 S-VLAN fair control unit 16 Queue 25 C in S-VLAN -Fair control unit 30, 40 Ethernet (registered trademark) line with weighting according to the number of VLANs

Claims (4)

A QoS control device that performs QoS control on a ring-type IEEE802.1ad or IEEE802.1ah hierarchical VLAN using Ethernet (registered trademark),
Before the traffic flows into the ring line,
A means to perform traffic fair control in Customer VLAN (C-VLAN) units,
A QoS control apparatus comprising means for performing traffic fair control in Service VLAN (S-VLAN) units in a ring section. The QoS control apparatus according to claim 1 , further comprising means for performing traffic fair control in which the traffic fair control in units of S-VLANs is applied with weighting according to the number of C-VLANs in the S-VLAN. A QoS control method for performing QoS control on a ring-type IEEE802.1ad or IEEE802.1ah hierarchical VLAN using Ethernet (registered trademark),
Before the traffic flows into the ring line of the communication node, the first fair control means of the communication node performs traffic fair control on a customer VLAN (C-VLAN) basis,
A QoS control method, wherein the second fair control means in the ring section of the communication node performs traffic fair control in Service VLAN (S-VLAN) units. 4. The QoS control method according to claim 3 , wherein the traffic fair control in units of S-VLANs is performed by applying traffic weighting according to the number of C-VLANs in the S-VLAN.

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