CN103051536A - Quick multicast switching method of two-layer redundant link - Google Patents
Quick multicast switching method of two-layer redundant link Download PDFInfo
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Abstract
The invention discloses a quick multicast switching method of a two-layer redundant link; at least two redundant links are arranged between downstream network equipment and upstream network equipment, wherein a main link is in a Forwarding state in a spanning tree and a backup link is in a Discarding state in the spanning tree. After receiving a multicast adding message from a user, the downstream network equipment copies the message and sends the copy from the backup link apart after forwarding the message from the main link. The multicast message which arrives at the backup link is disposed because a port is in the Discarding state. After the main link has a fault, the backup link changes into the Forwarding state, and the multicast message which is originally disposed can be immediately forwarded to the user. The method applies data redundancy but not path redundancy and has no any requirements on the upstream network equipment, so that the multicast business switching time is greatly shortened, and the robustness and the continuity of the multicast business are enhanced.
Description
Technical field
The present invention relates to a kind of IP multicast control technology field, specifically a kind of fast multicast changing method of two layers of redundant link.
Background technology
In the access network communication of using Ethernet, multicast service (such as course on IPTV Web TV, conferencing over ip television services, the IP network etc.) more and more becomes a kind of general public's service.
Fig. 1 is a kind of typical IP multicast architecture signal, between subscriber's main station and multicast router, use the group membership to concern agreement, such as the IGMP among the typical IPv4 and the MLD among the IPv6, main frame is told multicast router by this agreement, wish to add and receive the information of certain particular multicast group, whether the member that the while multicast router is periodically inquired about certain known group in the local area network (LAN) by this agreement is in active state, to set up and to safeguard directly group membership's relation information of the section of networking of router; Simultaneously in order effectively to suppress group business stream in the diffusion of link layer, having introduced IGMP Snooping(IGMP in the network equipment of Access Layer intercepts) etc. multicast protocol, the above-mentioned network equipment can be SOHO Router(household small-size gateway), the SWITCH(switch) etc. form, they form multicast forward table and provide multicast service to copy, distribute according to this table to subscriber's main station by the multicast request report message of monitoring or the interception subscriber's main station sends to multicast router.
Usually, the network equipment of Access Layer generally has active and standby part of link connection to higher level's network equipment; Also can provide corresponding alternate device for some crucial higher level's network equipments, active and standby part of link is connected respectively to corresponding active and standby part of higher level's network equipment.When primary link broke down, network access equipment can switch to backup link and the business of further primary link being carried is recovered.
As shown in Figure 2, access switch is connected to two higher level's network equipment SWITCH1 and SWITCH2(alternate device simultaneously by two uplink interface Port1, Port2), in two layers of transmission network, adopt two layers of link redundancy agreement to make link backup work.Under normal circumstances, the SWITCH1 that the primary link of corresponding Port1 connects is in running order, and the SWITCH2 that the backup link of corresponding Port2 connects is in Status of Backups, or does separately backup or share multicast traffic stream as load balancing.When SWITCH1 fault, primary link physical connection fault or Port1 fault (general designation link failure), access switch will switch to the backup link that is comprised of alternate device SWITCH2 and Port2 and carry out work, but SWITCH2 does not have the multicast forwarding information on the SWITCH1.So, even backup link is connected to and obtains in the very short time setting up and link is recovered, but the multicast traffic stream that carries on the primary link can't be provided by backup link immediately.
Above-mentioned net environment, after link failure occured, even link is restored in a short period of time, if need to recover the front multicast service of link failure, the subscriber's main station that access switch accesses need to resend multicast and join request; Or the GMQ(common group membership query that sends by the cycle in multicast router cycle: General Member Query) query message, user respond query message multicast service are restored, its recovery process such as Fig. 3.But because GMQ time polling cycle is generally 125 seconds, and response message occured in subordinate equipment or user in 10 seconds, so its multicast service is longer recovery time, generally set up rear 135(125+10 at link-recovery or backup link this recovery time) random distribution in second.
In sum, at above-mentioned net environment, although can send the GMQ query message by the multicast router cycle multicast service is recovered, but, recovery time is (random distribution in 135 seconds) more at random, and recovery time is longer, and will affect multicast service provides.
Summary of the invention
The object of the present invention is to provide a kind of fast multicast changing method of two layers of redundant link, downstream network device has at least two links to link to each other with upstream network device, and receiving multicast data stream.
The fast multicast changing method of a kind of two layers of redundant link provided by the invention comprises the steps:
A) downstream network device is by setting up at least two redundant links between two layers of link redundancy agreement and upstream network device, wherein the primary link port is in the Forwarding state, normal transmitting-receiving user data package, the standby link port is in the Discarding state, does not receive and send any user data package;
B) downstream network device operation Layer 2 Multicast monitoring protocols after receiving multicast request message, to the primary link port repeat as multicast monitoring agreement routed port, and copies it from the standby link port and sends with the internal data packet form;
C) upstream network device is resolved described multicast request message, forms multicast forward table, and the main/slave link of the network equipment connects the port repeat multicast traffic stream downstream;
D) multicast traffic stream the primary link port received according to the Layer 2 Multicast monitoring protocols of downstream network device is forwarded to multicast group member port, and the multicast packet that the standby link port is received is blocked in the port, is left intact;
E) downstream network device is carried out the fault detect of two layers of redundant link;
F) in case downstream network device detects fault at primary link, according to two layers of link redundancy agreement, the standby link port is become the Forwarding state, and the multicast traffic stream of the standby link port being received according to the Layer 2 Multicast monitoring protocols is forwarded to multicast group member port.
Described downstream network device is passed through between two layers of link redundancy agreement and the upstream network device with active and standby part of link mode work, two layers of link redundancy agreement include but not limited to STP/RSTP/MSTP and other two layers of link redundancy agreements that improve based on Spanning-Tree Protocol, such as ERPS, SmarLink, RRPP.
Primary link between described downstream network device and the upstream network device is in the Forwarding state, and backup link is in the Discarding state; The link that is in the Forwarding state can normally be received and dispatched the user data message, is in the link drop all customer data message of Discarding state, but can transmits the internal data message.
Described user data message refers to that the data message transmitted from switch outside need switch, described built-in message refer to from switch inside, the data message that is generated by CPU.The port that is in the Discarding state can't block the internal data message.
The MLD Snooping agreement of the IGMP Snooping agreement that described Layer 2 Multicast monitoring protocols is the IPv4 standard or IPv6 standard.Described multicast request message is the IGMP multicast of the IPv4 standard MLD multicast of message or the IPv6 standard message that joins request that joins request.
The advantage of the fast multicast changing method of a kind of two layers of redundant link of the present invention is: realizing the backup of data flow on redundant path before the link failure, rather than the backup of simple path.After link switched, as long as backup link becomes the Forwarding state, multicast traffic stream can be given the user who needs reception by forwarding immediately.Traditional path redundancy method needs backup link to rebulid the path after primary link breaks down, thereby the multicast recovery time equals the time sum that link switching time and backup link rebulid multicast path.The present invention made backup link have redundant data before link switching, thereby so that the multicast recovery time only equal the link switching time, there is not backup link to rebulid the time of multicast path, thereby can be so that the recovery that multicast service obtains being exceedingly fast, improved the reliability of multicast service, and because what adopt all is international standard protocol, thereby does not all have special technical requirement to upstream and downstream equipment, can use in the network environment widely.
Description of drawings
Fig. 1 is a kind of typical IP multicast structural representation;
Fig. 2 is that access switch has the multicast model that two uplink interfaces are connected to different higher level's network equipments;
Fig. 3 is for recovering schematic diagram by GMQ inquiry mode multicast service;
Fig. 4 is the fast multicast switching flow schematic diagram of up redundant link provided by the invention.
Embodiment
The invention provides a kind of fast multicast changing method of two layers of redundant link, comprise the steps:
A) downstream network device is by setting up at least two redundant links between two layers of link redundancy agreement and upstream network device, wherein the primary link port is in the Forwarding state, normal transmitting-receiving user data package, the standby link port is in the Discarding state, does not receive and send any user data package;
B) downstream network device operation Layer 2 Multicast monitoring protocols after receiving multicast request message, to the primary link port repeat as multicast monitoring agreement routed port, and copies it from the standby link port and sends with the internal data packet form;
C) upstream network device is resolved described multicast request message, forms multicast forward table, and the main/slave link of the network equipment connects the port repeat multicast traffic stream downstream;
D) multicast traffic stream the primary link port received according to the Layer 2 Multicast monitoring protocols of downstream network device is forwarded to multicast group member port, and the multicast packet that the standby link port is received is blocked in the port, is left intact;
E) downstream network device is carried out the fault detect of two layers of redundant link;
F) in case downstream network device detects fault at primary link, according to two layers of link redundancy agreement, the standby link port is become the Forwarding state, and the multicast traffic stream of the standby link port being received according to the Layer 2 Multicast monitoring protocols is forwarded to multicast group member port.
Described downstream network device is passed through between two layers of link redundancy agreement and the upstream network device with master, link mode work, two layers of link redundancy agreement include but not limited to STP/RSTP/MSTP and other two layers of link redundancy agreements that improve based on Spanning-Tree Protocol, such as ERPS, SmarLink, RRPP.
Primary link between described downstream network device and the upstream network device is in the Forwarding state, and backup link is in the Discarding state; The link that is in the Forwarding state can normally be received and dispatched the user data message, is in the link drop all customer data message of Discarding state, but can transmits the internal data message.
Described user data message refers to that the data message transmitted from switch outside need switch, described built-in message refer to from switch inside, the data message that is generated by CPU.The port that is in the Discarding state can't block the internal data message.
The MLD Snooping agreement of the IGMP Snooping agreement that described Layer 2 Multicast monitoring protocols is the IPv4 standard or IPv6 standard.Described multicast request message is the IGMP multicast of the IPv4 standard MLD multicast of message or the IPv6 standard message that joins request that joins request.
Below in conjunction with accompanying drawing, embodiments of the present invention are described in detail.
Fig. 4 is the fast multicast switching flow schematic diagram of up redundant link provided by the invention:
In conjunction with front shown in Figure 2, access switch has two links and different higher level's network equipment SWITCH1/SWITCH2 and links to each other and form active and standby part of link, backup link or do separately backup or make load balancing and also share multicast traffic stream is provided.In addition, do not get rid of access switch and have many backup links.
Step S40, access switch except to the primary link of up redundant link is transmitted, also copy it and forward from other backup links after receiving the user multicast request message;
Step S41, upstream network device is all received user's multicast request message on active and standby part of link, carry out packet parsing: if the multicast traffic stream of request exists at this equipment, it will upgrade its multicast forward table and flow by active and standby part of chain road direction access switch multicast data forwarding; Otherwise it can to this multicast traffic stream of multicast router request, then be transmitted to access switch with this multicast traffic stream.On the other hand, because the backup link of access switch is in the Discarding state, all customer data message on the backup link all is dropped, thereby only has the multicast traffic stream on the primary link to be forwarded to the user.
The multicast request message that the user sends can be the IGMP multicast of the IPv4 standard MLD multicast of message or the IPv6 standard message that joins request that joins request.
Step S42, when primary link breaks down, such as: the SWTICH port that the access switch link port that this link is corresponding, link physical fault or this link are corresponding etc. breaks down and causes multicast traffic stream to interrupt, and access switch need to be carried out link failure detection to recover as early as possible link;
In the corresponding situation that has active and standby part of two links shown in Figure 2, access switch is by two layers of link redundancy agreement, as carrying out STP/RSTP/MSTP, Smart Link, ERPS etc. usually.So, access switch can when primary link breaks down, switch on another backup link.
Become the Fowarding state in case reserve link is enabled, access switch can be transmitted to the user with the multicast traffic stream of transmitting on the reserve link and coming immediately.
Because the mode of said process by data redundancy rather than path redundancy realizes that fast multicast switches, so multicast depends on the link switching time switching time fully, without any and outer expense.
Although above-mentioned being illustrated as the invention provides some embodiment; be not to limit protection scope of the present invention; the professional of the art can be under the prerequisite that does not depart from the scope of the present invention with spirit; embodiment is carried out various modifications; realize two layers of link redundancy agreement of main/slave link backup by the obstruction mode such as adopting other; other realize the method that port status blocks by non-stp state, and this modification all is within the scope of the present invention.
Claims (6)
1. the fast multicast changing method of two layers of redundant link comprises the steps:
A) downstream network device is by setting up at least two redundant links between two layers of link redundancy agreement and upstream network device, wherein the primary link port is in the Forwarding state, normal transmitting-receiving user data package, the standby link port is in the Discarding state, does not receive and send any user data package;
B) downstream network device operation Layer 2 Multicast monitoring protocols after receiving multicast request message, to the primary link port repeat as multicast monitoring agreement routed port, and copies it from the standby link port and sends with the internal data packet form;
C) upstream network device is resolved described multicast request message, forms multicast forward table, and the active and standby link of the network equipment connects the port repeat multicast traffic stream downstream;
D) multicast traffic stream the primary link port received according to the Layer 2 Multicast monitoring protocols of downstream network device is forwarded to multicast group member port, and the multicast packet that the standby link port is received is blocked in the port, is left intact;
E) downstream network device is carried out the fault detect of two layers of redundant link;
F) in case downstream network device detects fault at primary link, according to two layers of link redundancy agreement, the standby link port is become the Forwarding state, and the multicast traffic stream of the standby link port being received according to the Layer 2 Multicast monitoring protocols is forwarded to multicast group member port.
2. the fast multicast changing method of a kind of two layers of redundant link as claimed in claim 1, it is characterized in that: described downstream network device is passed through between two layers of link redundancy agreement and the upstream network device with active and standby part of link mode work, two layers of link redundancy agreement include but not limited to STP/RSTP/MSTP and other two layers of link redundancy agreements that improve based on Spanning-Tree Protocol, such as ERPS, SmarLink, RRPP.
3. the fast multicast changing method of a kind of two layers of redundant link as claimed in claim 1, it is characterized in that: the primary link between described downstream network device and the upstream network device is in the Forwarding state, and backup link is in the Discarding state; The link that is in Forwarding state attitude can normally be received and dispatched the user data message, is in the link drop all customer data message of Discarding state, but can transmits the internal data message.
4. such as the fast multicast changing method of claim 1 or 3 described a kind of two layers of redundant link, it is characterized in that: described user data message refers to the data message transmitted from switch outside need switch, described built-in message refers to from switch inside, by the data message that CPU generates, the port that is in the Discarding state can't block the internal data message.
5. the fast multicast changing method of a kind of two layers of redundant link as claimed in claim 1 is characterized in that: the MLD Snooping agreement of the IGMP Snooping agreement that described Layer 2 Multicast monitoring protocols is the IPv4 standard or IPv6 standard.
6. the fast multicast changing method of a kind of two layers of redundant link as claimed in claim 1 is characterized in that: described multicast request message is the IGMP multicast of the IPv4 standard MLD multicast of message or the IPv6 standard message that joins request that joins request.
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| CN104869075A (en) * | 2015-05-18 | 2015-08-26 | 杭州华三通信技术有限公司 | Method and apparatus for preventing multicast traffic congestion |
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Application publication date: 20130417 |