CN103326941A - Method for router to fast forwarding IP message - Google Patents
Method for router to fast forwarding IP message Download PDFInfo
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Abstract
The invention discloses a method for a router to fast forwarding an IP message. The method comprises the following steps: A 10, a bottom driver receives the IP message and judges whether the IP message is the unicast IP message, an A20 is executed if the IP message is a unicast IP message, and an A60 is executed if the IP message is not the unicast IP message; A20, whether the header of the IP message is legal is judged, an A30 is executed if the header of the IP message is legal, and the IP message is abandoned if the header of the IP message is illegal; A30, a PPL table is searched for, an A40 is executed if table items identical to an SIP and a DIP in the IP message are found, or else the A60 is executed; A40, the age of the table items in the PPL table is updated to 1, a port MAC and a port DMAC are acquired from corresponding table items of the PPL table, and an SMAC and a DMAC of the IP message are updated; A50, a TTL is subtracted by one, a checksum is calculated again, and the IP message is sent; A60, the IP message is sent to a protocol stack for being forwarded. According to the method for the router to fast forwarding the IP message, the forwarding is finished through the point-to-point link forwarding table (PPL table) established at the bottom driver of the router, the IP message does not need to be sent to the protocol stack to search for a routing table or an ARP table, and therefore the network bandwidth is effectively improved on the condition that the hardware cost is not increased.
Description
Technical field
The present invention relates to IP message repeating field, be specifically related to router to the fast forwarding method of IP message.
Background technology
For the router of realizing message repeating by software, forwarding process is the key factor that determines its overall performance.Traditional unicast message forwarding process is as follows: the bottom layer driving of router is delivered to protocol stack to message; Protocol stack at first abandons the message that contains the invalid packet head, determines that then this message is to arrive local or need to transmit; For arriving local message, serve layer protocol software and process; Message for the needs forwarding, then search routing table and determine port, after revising heading, search ARP(Address Resolution Protocol, address resolution protocol) table, upgrade target MAC (Media Access Control) address DMAC, obtain new source MAC SMAC by outbound port again, at last message is sent to the bottom layer driving of router.
According to above-mentioned forwarding process, each IP unicast message will be delivered to protocol stack from the bottom layer driving of router first, carry out that identical route querying, ARP search, message upgrades, and then send it back the bottom layer driving of router, even they have identical purpose IP address, therefore, forward efficiency is lower, has wasted cpu resource.
Summary of the invention
Technical problem to be solved by this invention is to solve the lower problem of router forward efficiency.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention provides a kind of router to the fast forwarding method of IP message, may further comprise the steps:
Steps A 10: after the bottom layer driving of router is received the IP message, judge whether this IP message is the IP unicast message, if it is execution in step A20; Otherwise execution in step A60;
Steps A 20: whether the head of judging this IP message is legal, if legal then execution in step A30; Otherwise abandon this IP message;
Steps A 30: the table take SIP, DIP as keyword search PPL, if find the list item identical with SIP, DIP in this IP message then execution in step A40, otherwise execution in step A60;
Steps A 40: the age that upgrades this PPL list item is 1, obtains outbound port MAC, DMAC from the corresponding list item of PPL table, and upgrades SMAC, the DMAC of this IP message;
Steps A 50: the TTL of this IP message subtract 1 and again calculation check and, then send this IP message; Return steps A 10, process next message;
Steps A 60: send protocol stack this IP message, through sending after the standard I P software forward flow processing.
In said method, set up described PPL table method as follows:
Steps A 201: search current PPL table, if search successfully, then this message is transmitted according to PPL table lookup result; Otherwise execution in step A202;
Steps A 202: give this IP message protocol stack to transmit, and for this message creates a PPL clauses and subclauses ppl2, and record SIP, DIP, gateway, outbound port and SMAC, the DMAC vacancy;
Steps A 203: the table take gateway ip address as keyword search SFF-ARP, if find the SFF-ARP clauses and subclauses corresponding with this gateway, execution in step A204 then, otherwise execution in step A205;
Steps A 204: the DMAC of corresponding SFF-ARP clauses and subclauses is filled in into PPL clauses and subclauses ppl2, and this entry attributes is set is VALID, then execution in step A206;
Steps A 205: be the setup of attribute of clauses and subclauses ppl2 INVALID, execution in step A209 then;
Steps A 206: search the PPL table with clauses and subclauses ppl2, if find the coupling clauses and subclauses then execution in step A208, otherwise execution in step A207;
Steps A 207: clauses and subclauses ppl2 is added the PPL table, finish;
Steps A 208: the DMAC with clauses and subclauses ppl2 carries, upgrade the DMAC that PPL shows corresponding list item, finish;
Steps A 209: search the PPL-INV table with clauses and subclauses ppl2, if find the coupling clauses and subclauses then the nothing operation, otherwise execution in step A210;
Steps A 210: clauses and subclauses ppl2 is added the PPL-INV table, finish.
In said method, set up the process that the SFF-ARP table reaches with PPL shows, the PPL-INV table is related as follows:
Steps A 301:IP protocol stack is learnt new arp entry, creates new SFF-ARP clauses and subclauses arp2, record gateway ip address and dmac address information;
Steps A 302: with the IP address search SFF-ARP of arp2 table, if find the SFF-ARP clauses and subclauses arp-tmp identical with the IP address of arp2, execution in step A303 then, otherwise execution in step A304;
Steps A 303: whether the MAC Address that checks new clauses and subclauses arp2 is identical with the MAC Address of arp-tmp, if not identical execution in step A305, otherwise execution in step A308;
Steps A 304: clauses and subclauses arp2 is added SFF-ARP table, then execution in step A306;
Steps A 305: upgrade the DMAC information of arp-tmp with the MAC of clauses and subclauses arp2, then search the PPL table, upgrade the DMAC of the gateway ip address PPL clauses and subclauses identical with the IP address of arp-tmp, then execution in step A308;
Steps A 306: search PPL-INV table, if the PPL-INV table clause that exists gateway ip address to equate with the IP address of clauses and subclauses arp2 in this table, execution in step A307 then, otherwise execution in step A308;
Steps A 307: steps A 306 described PPL-INV clauses and subclauses from the PPL-INV list deletion, and filling in DMAC, arranging after the list item attribute is VALID, are joined the PPL table;
Steps A 308: return.
In said method, it is as follows that PPL table and PPL-INV show overtime aging step:
Steps A 401: start timer, fixed cycle scanning PPL table;
Steps A 402: check the current clauses and subclauses of PPL table, if be not empty, execution in step A403, otherwise execution in step A407;
Steps A 403: the age of the current clauses and subclauses of PPL table is subtracted 1;
Steps A 404: check the age of the current clauses and subclauses of PPL, if age=-2, execution in step A405 then, otherwise execution in step A406;
Steps A 405: delete current PPL list item;
Steps A 406: search the next clauses and subclauses of PPL table, then execution in step A402;
Steps A 407: scanning PPL-INV table;
Whether the current clauses and subclauses of steps A 408:PPL-INV table are empty, if be empty, and execution in step A409 then, otherwise execution A413;
Steps A 409: the age of the current clauses and subclauses of PPL-INV table is subtracted 1;
Steps A 410: check the age of the current clauses and subclauses of current PPL table, if age=-2, execution in step A411 then, otherwise execution in step A412;
Steps A 411: the current clauses and subclauses of deletion PPL table;
Steps A 412: search clauses and subclauses of lower PPL table, then execution in step A408;
Steps A 413: withdraw from scanning.
In said method, the process that deletion SFF-ARP table reaches with ARP shows, PPL shows, the PPL-INV table is related is as follows:
Steps A 501:IP protocol stack arp entry arp1 is overtime aging;
Steps A 502: search PPL table, if found the gateway ip address PPL clauses and subclauses identical with the IP address of clauses and subclauses arp1, execution in step A506 then, otherwise execution in step A503;
Steps A 503: search the SFF-ARP table, if found the IP address SFF-ARP clauses and subclauses identical with the IP address of clauses and subclauses arp1 then execution in step A504, otherwise execution in step A505;
Steps A 504: the corresponding clauses and subclauses of deletion from the SFF-ARP table;
Steps A 505:IP protocol stack deletion arp1;
Steps A 506: do not allow to delete these SFF-ARP clauses and subclauses, return failure.
The present invention, transmit (PPL table) by the point-to-point link that creates in the bottom layer driving of router and finish forwarding, to regarding a point-to-point link (PPL) from the source address to the destination address as, all have the data message of identical SIP, DIP and can transmit via this point-to-point link SFF the address of each SIP, DIP composition.First data message on the point-to-point link is transmitted by protocol stack and is created the PPL table clause at bottom software, the message that has afterwards identical SIP, DIP is directly shown forwarding by the PPL that searches bottom layer driving and is not needed to send protocol stack to search routing table, ARP table, effectively raises the network bandwidth in the situation that do not increase hardware cost.
Description of drawings
Fig. 1 is method flow diagram provided by the invention;
Fig. 2 is the flow chart of setting up the PPL table among the present invention;
Fig. 3 sets up the SFF-ARP table and shows related flow chart with PPL table, PPL-INV among the present invention;
Fig. 4 is that PPL table, PPL-INV show overtime aging flow chart among the present invention;
Fig. 5 is that deletion SFF-ARP shows and shows with software ARP among the present invention, PPL shows, PPL-INV shows related flow chart.
Embodiment
Below in conjunction with accompanying drawing the present invention is made detailed explanation.
At first employed term (abbreviation) among the present invention is explained as follows:
SFF: software fast-forwarding.
PPL: point-to-point link.
PPL-INV: illegal point-to-point link.
SIP: source IP address.
DIP: purpose IP address.
SMAC: source MAC.
DMAC: target MAC (Media Access Control) address.
Fig. 1 is that data message is searched the process schematic diagram that the PPL table is transmitted among the present invention, may further comprise the steps:
Steps A 10: after the bottom layer driving of router is received the IP message, judge whether this IP message is the IP unicast message, if it is execution in step A20; Otherwise execution in step A60;
Steps A 20: whether the head of judging this IP message is legal, if legal then execution in step A30; Otherwise abandon this IP message;
Steps A 30: the table take SIP, DIP as keyword search PPL, if find the list item identical with SIP, DIP in this IP message then execution in step A40, otherwise execution in step A60;
Steps A 40: the age mark age that PPL is shown corresponding list item puts 1, indicates that this PPL list item used recently, refreshed, and be to enliven list item.Then from the corresponding list item of PPL table, obtain outbound port MAC, DMAC, and upgrade SMAC, the DMAC of this IP message;
Steps A 50: the TTL of this IP message subtract 1 and again calculation check and, then this IP message is sent to hardware; Return steps A 10, process next message;
Steps A 60: send protocol stack this IP message, through sending after the standard I P software forward flow processing.This flow process is not in this paper coverage, and steps A 202 can create new ppl list item in standard I P protocol stack repeating process.
Fig. 2 is the process schematic diagram of setting up the PPL table, may further comprise the steps:
Steps A 201: search current PPL table, if search successfully, then this message is transmitted according to PPL table lookup result; Otherwise execution in step A202; The message that belongs to unknown list item is searched PPL and is shown unsuccessfully, send protocol stack to process, and creates new list item; Belong to the message that PPL shows known list item, table look-up successfully, according to lookup result, directly transmit.
Steps A 202: give this IP message protocol stack to transmit, and PPL clauses and subclauses ppl2 of this message establishment, and record SIP, DIP, gateway, outbound port and SMAC, the DMAC vacancy; Clauses and subclauses ppl2 is interim clauses and subclauses, adopt same data structure with the PPL list item, determinant attribute such as record SIP, DIP etc. is that new clauses and subclauses just add the PPL table to it in case determine it with respect to the PPL table, if existing clauses and subclauses are then upgraded the attribute of the existing clauses and subclauses of coupling in the PPL table;
Steps A 203: the table take gateway ip address as keyword search SFF-ARP, if find the SFF-ARP clauses and subclauses corresponding with this gateway, execution in step A204 then, otherwise execution in step A205;
Steps A 204: the DMAC of corresponding SFF-ARP clauses and subclauses is filled in into PPL clauses and subclauses ppl2 all required information of complete preparation IP unicast message repeating, and this entry attributes is set is VALID, then execution in step A206;
Steps A 205: be the setup of attribute of clauses and subclauses ppl2 INVALID, execution in step A209 then;
Steps A 206: search the PPL table with clauses and subclauses ppl2, if find the coupling clauses and subclauses then execution in step A208, otherwise execution in step A207;
Steps A 207: clauses and subclauses ppl2 is added the PPL table, finish;
Steps A 208: the DMAC with clauses and subclauses ppl2 carries, upgrade the DMAC that PPL shows corresponding list item, finish;
Steps A 209: search the PPL-INV table with clauses and subclauses ppl2, if find the coupling clauses and subclauses then the nothing operation, otherwise execution in step A210;
Steps A 210: clauses and subclauses ppl2 is added the PPL-INV table, allow router learn to generate as early as possible the PPL legitimate entries behind the ARP, finish.
Fig. 3 is that SFF-ARP shows foundation and shows related process schematic diagram with PPL table, PPL-INV, may further comprise the steps:
Steps A 301:IP protocol stack is learnt new arp entry, creates new SFF-ARP clauses and subclauses arp2, record gateway ip address and dmac address information;
Steps A 302: with the IP address search SFF-ARP of arp2 table, if find the SFF-ARP clauses and subclauses arp-tmp identical with the IP address of arp2, execution in step A303 then, otherwise execution in step A304;
Steps A 303: whether the MAC Address that checks new clauses and subclauses arp2 is identical with the MAC Address of arp-tmp, if not identical execution in step A305, otherwise execution in step A308;
Steps A 304: clauses and subclauses arp2 is added SFF-ARP table, then execution in step A306;
Steps A 305: the DMAC information of upgrading arp-tmp with the MAC of clauses and subclauses arp2, its objective is in the situation that the ARP information updating, upgrade synchronously PPL table information, to avoid steps A to get access to wrong DMAC information, network change is followed in assurance, and to dynamically update PPL information unobstructed with assured forwarding, then search the PPL table, upgrade the DMAC of the gateway ip address PPL clauses and subclauses identical with the IP address of arp-tmp, then execution in step A308;
Steps A 306: search PPL-INV table, if the PPL-INV table clause that exists gateway ip address to equate with the IP address of clauses and subclauses arp2 in this table, execution in step A307 then, otherwise execution in step A308;
Steps A 307: from the PPL-INV list deletion, and to fill in DMAC, the list item attribute is set be after the VALID, joins the PPL table steps A 306 described PPL-INV clauses and subclauses;
Steps A 308: without operation, directly return.
Among steps A 306, the A307, move to the PPL table behind the entry updating DMAC of PPL-INV table, doing like this can be in time being recorded to PPL table, dynamically adapting network change by study to the PPL clauses and subclauses that new ARP changes legal attribute into.
For prevent PPL table, the PPL-INV table is unlimited expands, must periodic scanning, remove the long-term not list item of usefulness, so carried out the PPL table, the PPL-INV table is overtime aging.If this list item was used recently, its age mark age is set to 1 in steps A 40 so, guarantee this list item wait in continuous 3 scan periods not deleted.Fig. 4 is that PPL table, PPL-INV show overtime aging process schematic diagram among the present invention, may further comprise the steps:
Steps A 401: start timer, fixed cycle scanning PPL table;
Steps A 402: check the current clauses and subclauses of PPL table, if be not empty, execution in step A403, otherwise execution in step A407;
Steps A 403: the age of the current clauses and subclauses of PPL table is subtracted 1;
Steps A 404: check the age of the current clauses and subclauses of PPL, if age=-2, execution in step A405 then, otherwise execution in step A406;
Steps A 405: delete current PPL list item;
Steps A 406: search the next clauses and subclauses of PPL table, then execution in step A402;
Steps A 407: scanning PPL-INV table;
Whether the current clauses and subclauses of steps A 408:PPL-INV table are empty, if be empty, and execution in step A409 then, otherwise execution A413;
Steps A 409: the age of the current clauses and subclauses of PPL-INV table is subtracted 1;
Steps A 410: check the age of the current clauses and subclauses of current PPL table, if age=-2, execution in step A411 then, otherwise execution in step A412;
Steps A 411: the current clauses and subclauses of deletion PPL table;
Steps A 412: search clauses and subclauses of lower PPL table, then execution in step A408;
Steps A 413: withdraw from scanning.
Fig. 5 is SFF-ARP list deletion and the process schematic diagram related with software ARP table, PPL table, PPL-INV table among the present invention, may further comprise the steps:
Steps A 501:IP protocol stack arp entry arp1 is overtime aging;
Steps A 502: search PPL table, if found the gateway ip address PPL clauses and subclauses identical with the IP address of clauses and subclauses arp1, execution in step A506 then, otherwise execution in step A503;
Steps A 503: search the SFF-ARP table, if found the IP address SFF-ARP clauses and subclauses identical with the IP address of clauses and subclauses arp1 then execution in step A504, otherwise execution in step A505;
Steps A 504: the corresponding clauses and subclauses of deletion from the SFF-ARP table;
Steps A 505:IP protocol stack deletion arp1;
Steps A 506: do not allow to delete these SFF-ARP clauses and subclauses, return failure; IP stack can not be deleted arp1.
If the gateway ip address that certain PPL clauses and subclauses is being used is exactly the IP address of the current arp entry that will delete, just illustrate that gateway corresponding to this arp entry participating in transmitting, so current ARP information commonly used is not deleted in steps A 502 special processings.
The present invention has three advantages:
The first, pure software is realized, is not increased hardware cost;
The second, do not need to carry out complicated configuration, in the IP repeating process, automatically realize;
The 3rd, do not need the IP stack main body is done large change, be convenient to transplant.
Use router of the present invention, can improve forwarding performance 300%, main cause is as follows:
1) reduced the number of times of tabling look-up, SFF only need to search the PPL table, and common routing forwarding need to be searched routing table and ARP table;
2) reduced the software level that package forward experiences, SFF only finishes forwarding at bottom software, and common forwarding then needs bottom software that packet is delivered to protocol stack, sends back to after treatment bottom software again;
3) reduced the task switching, SFF only finishes forwarding by the bottom software task, and protocol stack kernel task only is responsible for the management maintenance of PPL forwarding-table item and is not participated in forwarding process; And common forwarding needs bottom software task and protocol stack kernel task to participate in simultaneously forwarding process.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, all falls within protection scope of the present invention.
Claims (5)
1. router is characterized in that the fast forwarding method of IP message, may further comprise the steps:
Steps A 10: after the bottom layer driving of router is received the IP message, judge whether this IP message is the IP unicast message, if it is execution in step A20; Otherwise execution in step A60;
Steps A 20: whether the head of judging this IP message is legal, if legal then execution in step A30; Otherwise abandon this IP message;
Steps A 30: the table take SIP, DIP as keyword search PPL, if find the list item identical with SIP, DIP in this IP message then execution in step A40, otherwise execution in step A60;
Steps A 40: the age that upgrades this PPL list item is 1, obtains outbound port MAC, DMAC from the corresponding list item of PPL table, and upgrades SMAC, the DMAC of this IP message;
Steps A 50: the TTL of this IP message subtract 1 and again calculation check and, then send this IP message; Return steps A 10, process next message;
Steps A 60: send protocol stack this IP message, through sending after the standard I P software forward flow processing.
2. the method for claim 1 is characterized in that, sets up described PPL table method as follows:
Steps A 201: search current PPL table, if search successfully, then this message is transmitted according to PPL table lookup result; Otherwise execution in step A202;
Steps A 202: give this IP message protocol stack to transmit, and for this message creates a PPL clauses and subclauses ppl2, and record SIP, DIP, gateway, outbound port and SMAC, the DMAC vacancy;
Steps A 203: the table take gateway ip address as keyword search SFF-ARP, if find the SFF-ARP clauses and subclauses corresponding with this gateway, execution in step A204 then, otherwise execution in step A205;
Steps A 204: the DMAC of corresponding SFF-ARP clauses and subclauses is filled in into PPL clauses and subclauses ppl2, and this entry attributes is set is VALID, then execution in step A206;
Steps A 205: be the setup of attribute of clauses and subclauses ppl2 INVALID, execution in step A209 then;
Steps A 206: search the PPL table with clauses and subclauses ppl2, if find the coupling clauses and subclauses then execution in step A208, otherwise execution in step A207;
Steps A 207: clauses and subclauses ppl2 is added the PPL table, finish;
Steps A 208: the DMAC with clauses and subclauses ppl2 carries, upgrade the DMAC that PPL shows corresponding list item, finish;
Steps A 209: search the PPL-INV table with clauses and subclauses ppl2, if find the coupling clauses and subclauses then the nothing operation, otherwise execution in step A210;
Steps A 210: clauses and subclauses ppl2 is added the PPL-INV table, finish.
3. method as claimed in claim 2 is characterized in that, sets up the process that the SFF-ARP table reaches with PPL shows, the PPL-INV table is related as follows:
Steps A 301:IP protocol stack is learnt new arp entry, creates new SFF-ARP clauses and subclauses arp2, record gateway ip address and dmac address information;
Steps A 302: with the IP address search SFF-ARP of arp2 table, if find the SFF-ARP clauses and subclauses arp-tmp identical with the IP address of arp2, execution in step A303 then, otherwise execution in step A304;
Steps A 303: whether the MAC Address that checks new clauses and subclauses arp2 is identical with the MAC Address of arp-tmp, if not identical execution in step A305, otherwise execution in step A308;
Steps A 304: clauses and subclauses arp2 is added SFF-ARP table, then execution in step A306;
Steps A 305: upgrade the DMAC information of arp-tmp with the MAC of clauses and subclauses arp2, then search the PPL table, upgrade the DMAC of the gateway ip address PPL clauses and subclauses identical with the IP address of arp-tmp, then execution in step A308;
Steps A 306: search PPL-INV table, if the PPL-INV table clause that exists gateway ip address to equate with the IP address of clauses and subclauses arp2 in this table, execution in step A307 then, otherwise execution in step A308;
Steps A 307: steps A 306 described PPL-INV clauses and subclauses from the PPL-INV list deletion, and filling in DMAC, arranging after the list item attribute is VALID, are joined the PPL table;
Steps A 308: return.
4. method as claimed in claim 3 is characterized in that, it is as follows that PPL table and PPL-INV show overtime aging step:
Steps A 401: start timer, fixed cycle scanning PPL table;
Steps A 402: check the current clauses and subclauses of PPL table, if be not empty, execution in step A403, otherwise execution in step A407;
Steps A 403: the age of the current clauses and subclauses of PPL table is subtracted 1;
Steps A 404: check the age of the current clauses and subclauses of PPL, if age=-2, execution in step A405 then, otherwise execution in step A406;
Steps A 405: delete current PPL list item;
Steps A 406: search the next clauses and subclauses of PPL table, then execution in step A402;
Steps A 407: scanning PPL-INV table;
Whether the current clauses and subclauses of steps A 408:PPL-INV table are empty, if be empty, and execution in step A409 then, otherwise execution A413;
Steps A 409: the age of the current clauses and subclauses of PPL-INV table is subtracted 1;
Steps A 410: check the age of the current clauses and subclauses of current PPL table, if age=-2, execution in step A411 then, otherwise execution in step A412;
Steps A 411: the current clauses and subclauses of deletion PPL table;
Steps A 412: search clauses and subclauses of lower PPL table, then execution in step A408;
Steps A 413: withdraw from scanning.
5. method as claimed in claim 4 is characterized in that, the process that deletion SFF-ARP table reaches with ARP shows, PPL shows, the PPL-INV table is related is as follows:
Steps A 501:IP protocol stack arp entry arp1 is overtime aging;
Steps A 502: search PPL table, if found the gateway ip address PPL clauses and subclauses identical with the IP address of clauses and subclauses arp1, execution in step A506 then, otherwise execution in step A503;
Steps A 503: search the SFF-ARP table, if found the IP address SFF-ARP clauses and subclauses identical with the IP address of clauses and subclauses arp1 then execution in step A504, otherwise execution in step A505;
Steps A 504: the corresponding clauses and subclauses of deletion from the SFF-ARP table;
Steps A 505:IP protocol stack deletion arp1;
Steps A 506: do not allow to delete these SFF-ARP clauses and subclauses, return failure.
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| CN110572330A (en) * | 2019-09-17 | 2019-12-13 | 普联技术有限公司 | method, device and medium for realizing compatibility of forwarding acceleration function and protocol stack function |
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| CN115190100A (en) * | 2022-07-04 | 2022-10-14 | 中国联合网络通信集团有限公司 | Data forwarding method, VTEP gateway, electronic device and readable storage medium |
| TWI814643B (en) * | 2022-09-30 | 2023-09-01 | 明泰科技股份有限公司 | Routing information management method and system for a layer 3 switch |
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