CN104506374A - Method of specifying routing administrative distance through ISIS protocol - Google Patents
Method of specifying routing administrative distance through ISIS protocol Download PDFInfo
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- CN104506374A CN104506374A CN201510019919.XA CN201510019919A CN104506374A CN 104506374 A CN104506374 A CN 104506374A CN 201510019919 A CN201510019919 A CN 201510019919A CN 104506374 A CN104506374 A CN 104506374A
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- reachability information
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Abstract
The invention discloses a method of specifying routing administrative distance through an ISIS protocol. The method includes the steps that (A) a setting end intermediate system (IS) informs administrative distance for a reachable information IP (Internet Protocol) through a reachable information sub-TLV (Threshold Limit Value); (B) a calculating end intermediate system (IS) receives the administrative distance set for the reachable information IP from the setting end intermediate system (IS); (C) the routing of the reachable information IP is calculated according to the administrative distance. The method of specifying routing administrative distance through the ISIS protocol can specify one routing-specified administrative distance being not affected by the overall set protocol administrative distance of the ISIS protocol for facilitating network routing planning and facilitate the standardizing of particularly specified effective routing by planning one routing administrative distance and using a default protocol administrative distance for other routing so as to enable the routing to be effective or in failure.
Description
Technical field
The present invention relates to a kind of network equipment running ISIS Routing Protocol, ISIS agreement is suppressed to a kind of method of topology concussion, particularly relate to the method for a kind of ISIS agreement specified circuit by administrative distance.
Background technology
Intermediate System to Intermediate System (ISIS) is a kind of dynamic, based on the Interior Gateway Protocol (IGP) of Link State, after ISIS agreement consults to set up neighbours alternately by hello packet, each intermediate system (IS) produces the link-state information that link-state protocol data bag (LSP) describes this intermediate system (IS), and be sent in network, and also can all intermediate systems (IS) equipment sends in storage networking topology LSP, form LSD (LSDB), ISIS uses LSD (LSDB) to be calculated the Optimization route arriving destination address by shortest-path first algorithm (SPF) exactly.Administrative distance refers to a kind of confidence level of Routing Protocol.By reliability from high to low, primary distribution reliability rating, this reliability rating is just administrative distance to each Routing Protocol.Time identical route is learnt for multiple agreement (as: BGP, OSPF) simultaneously, just need to carry out preferentially with administrative distance.
Generally, each agreement has acquiescence and fixing administrative distance, such as: the administrative distance of ISIS agreement is 115, the administrative distance of ospf protocol is 110, so the routing priority of ISIS agreement is necessarily low than the routing priority of ospf protocol, when ISIS agreement learns identical route with ospf protocol simultaneously, traffic forwarding must be the route that OSPF that use management distance priority level is high learns.But, in some network planning scene, generally, need the administrative distance following protocol configuration, and some specific route wishes to break through this regulation special setting.Such as: when ISIS agreement learns identical route with ospf protocol simultaneously, traffic forwarding must be the route that OSPF that use management distance priority level is high learns.But the routing priority that the specific route of a certain bar is hopeful to make ISIS agreement learn is higher than ospf protocol.
Summary of the invention
The present invention is directed to shortcoming of the prior art, provide the method for a kind of Intermediate System to Intermediate System specified circuit by administrative distance.
In order to solve the problems of the technologies described above, the present invention is solved by following technical proposals:
Intermediate System to Intermediate System specified circuit, by a method for administrative distance, comprising:
A. setting party's intermediate system IS notices the administrative distance of a reachability information IP by a sub-TLV of reachability information;
B. intermediate system IS in the side's of calculating receives the administrative distance that setting party's intermediate system IS is arranged described reachability information IP;
C. described reachability information IP is calculated described reachability information IP route according to described administrative distance.
As preferably, namely described setting party's intermediate system and setting party IS are exactly the sub-TLV increasing a kind of protocol type newly by the administrative distance of reachability information TLV advertises reachability information IP, and this sub-TLV is called the sub-TLV of reachability information administrative distance.
As preferably, the sub-TLV of described reachability information administrative distance is kept in the reachability information entry ITEM of IP width extent reachability information TLV, what namely represent is the administrative distance of this IP reachability data entries, and an IP width extent reachability information TLV comprises at least one reachability information entry ITEM.
As preferably, comprise the sub-TLV of reachability information administrative distance described at least one in a reachability information IP entry ITEM, then first sub-TLV of described reachability information administrative distance works.
As preferably, described setting party's intermediate system IS is by the administrative distance of reachability information TLV advertises reachability information IP, it comprises: described setting party's intermediate system IS will specify the administrative distance of reachability information IP, a sub-TLV of reachability information administrative distance is comprised in the reachability information IP entry ITEM of IP width extent reachability information TLV, the sub-TLV of reachability information administrative distance specifies administrative distance, finally then this IP width extent reachability information TLV can be filled in LSP and notice.
As preferably, after the side of calculating intermediate system IS receives the administrative distance that setting party's intermediate system IS arranges described IP reachability information, described IP reachability information is calculated this IP reachability information router according to described administrative distance, this process comprises: described calculating side intermediate system IS receives described setting party's intermediate system IS LSP, if detect in an IP reachability information ITEM in IP width extent reachability information TLV and comprise a sub-TLV of reachability information administrative distance, the sub-TLV of reachability information administrative distance then specifies the administrative distance of this IP reachability information, this route is added in routing table, administrative distance is the administrative distance value that the sub-TLV of reachability information administrative distance specifies, the impact of the consultative management distance not totally arranged by ISIS agreement.
The present invention, owing to have employed above technical scheme, has significant technique effect:
(1) a specific administrative distance of route can be specified: the impact of the consultative management distance not totally arranged by ISIS agreement, can arrange a specific administrative distance of route, be convenient to the planning of network route.
(2) be convenient to the specific route come into force of specification: certain routing management distance can be planned, and other routes use the consultative management distance of acquiescence, thus certain route can be come into force or lose efficacy.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the sub-TLV schematic diagram of reachability information administrative distance.
Fig. 2 is topological diagram.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
Embodiment 1:
Intermediate System to Intermediate System specified circuit, by a method for administrative distance, comprising:
A. setting party's intermediate system IS notices the administrative distance of a reachability information IP by a sub-TLV of reachability information;
B. intermediate system IS in the side's of calculating receives the administrative distance that setting party's intermediate system IS is arranged described reachability information IP;
C. described reachability information IP is calculated described reachability information IP route according to described administrative distance.
Namely described setting party's intermediate system and setting party IS are exactly the sub-TLV of newly-increased a kind of protocol type by the administrative distance of reachability information TLV advertises reachability information IP, and this sub-TLV is called the sub-TLV of reachability information administrative distance.
The sub-TLV of described reachability information administrative distance is kept in the reachability information entry ITEM of IP width extent reachability information TLV, what namely represent is the administrative distance of this IP reachability data entries, and an IP width extent reachability information TLV comprises at least one reachability information entry ITEM; Comprise the sub-TLV of reachability information administrative distance described at least one in a reachability information IP entry ITEM, then first sub-TLV of described reachability information administrative distance works.
Described setting party's intermediate system IS is by the administrative distance of reachability information TLV advertises reachability information IP, it comprises: described setting party's intermediate system IS will specify the administrative distance of reachability information IP, a sub-TLV of reachability information administrative distance is comprised in the reachability information IP entry ITEM of IP width extent reachability information TLV, the sub-TLV of reachability information administrative distance specifies administrative distance, finally then this IP width extent reachability information TLV can be filled in LSP and notice.
After the side of calculating intermediate system IS receives the administrative distance that setting party's intermediate system IS arranges described IP reachability information, described IP reachability information is calculated this IP reachability information router according to described administrative distance, this process comprises: described calculating side intermediate system IS receives described setting party's intermediate system IS LSP, if detect in an IP reachability information ITEM in IP width extent reachability information TLV and comprise a sub-TLV of reachability information administrative distance, the sub-TLV of reachability information administrative distance then specifies the administrative distance of this IP reachability information, this route is added in routing table, administrative distance is the administrative distance value that the sub-TLV of reachability information administrative distance specifies, the impact of the consultative management distance not totally arranged by ISIS agreement.
Generally speaking, first a kind of Intermediate System to Intermediate System specified circuit will increase the sub-TLV of a type newly by the method for administrative distance:
As Fig. 1, the sub-TLV of newly-increased a kind of protocol type, be called the sub-TLV of reachability information administrative distance, comprise the type of a byte, the length of a byte, value is the administrative distance value of a byte.
The sub-TLV of reachability information administrative distance is kept in the reachability information entry ITEM of IP width extent reachability information TLV, represents the administrative distance of this reachability information IP entry.An IP width extent reachability information TLV comprises multiple reachability information entry ITEM.
If contain the sub-TLV of multiple reachability information administrative distances in a reachability information IP entry ITEM, only have first to work, other are then left in the basket.
Next specifies routing management, and concrete grammar is as follows:
1, when setting party's intermediate system IS needs the administrative distance of an appointment IP reachability information, so, a sub-TLV of reachability information administrative distance will be comprised in this IP reachability information ITEM of IP width extent reachability information TLV, the sub-TLV of reachability information administrative distance specifies its administrative distance, finally then this IP width extent reachability information TLV can be filled in LSP and notice.
2, after intermediate system IS in the side's of calculating receives setting party's intermediate system IS LSP, find to comprise a sub-TLV of reachability information administrative distance in an IP reachability information ITEM in IP width extent reachability information TLV, the sub-TLV of this reachability information administrative distance then specifies the administrative distance of this IP reachability information, so this route is added in routing table, administrative distance is the administrative distance value that the sub-TLV of reachability information administrative distance specifies, the impact of the consultative management distance not totally arranged by ISIS agreement.
As shown in Figure 2, for R1, R2, R3 form a network topology, wherein deploy OSPF and ISIS Routing Protocol, what run between R1 and R2 is ospf protocol, and what run between R2 and R3 is ISIS agreement.Be connected to a switch S1 between R2 and R3, S1 is connected to a main frame host1.
Obviously, according to such as deploy, above R2, from the R3 study of ISIS Routing Protocol to the network segment of 1.1.1.0/24, above R2, also can learn the network segment of 1.1.1.0/24 from the R1 of OSPF Routing Protocol simultaneously.Under default situations, the administrative distance of ISIS is the administrative distance of 115, OSPF is 110, so, the flow that R2 arrives the 1.1.1.0/24 network segment can arrive S1 by R1, finally arrives main frame host1, employs the route that OSPF Routing Protocol learns from R1 and forwards.The identical route learnt from OSPF with ISIS Routing Protocol while of other all employs the route that OSPF learns and carries out traffic forwarding.
In addition, if the consultative management distance of ISIS is set to 100, the administrative distance of OSPF Routing Protocol remains the words of 110, so, the flow that R2 arrives the 1.1.1.0/24 network segment can arrive S1 by R3, final arrival main frame host1, employ ISIS Routing Protocol from R3 study to route forward.The identical route learnt from OSPF with ISIS Routing Protocol while of other all employs the route that ISIS learns and carries out traffic forwarding.
Obviously, in default configuration situation, the administrative distance of ISIS is the administrative distance of 115, OSPF is 110; If wish that configuring R2 arrives the flow of the 1.1.1.0/24 network segment by R3 arrival switch S1, final arrival main frame host1, and the flow that the route learnt from OSPF and ISIS while that other being all still uses OSPF to learn forwards.Even when the administrative distance that the administrative distance configuring ISIS is 100, OSPF is 110, obviously all can not realize.
After using the present invention, wish that configuring R2 arrives the flow of the 1.1.1.0/24 network segment by R3 arrival switch S1, final arrival main frame host1, and the flow that the route learnt from OSPF and ISIS while that other being all still uses OSPF to learn forwards.Can when using default protocol administrative distance, the administrative distance of ISIS is the administrative distance of 115, OSPF is 110.On the R3 running ISIS agreement, the appointment administrative distance that can configure the 1.1.1.0/24 network segment is 100, and this route of the R3 that the router on any network is learnt by ISIS all uses the administrative distance of 100.Now, R3 can notice this IP reachability information 1.1.1.0/24 in LSP, filled in IP width extent reachability information TLV by this IP reachability information ITEM, and in IP reachability information ITEM, carry a sub-TLV of reachability information administrative distance, administrative distance is 100.After R2 receives the LSP that as above R3 generates, find that IP width extent accessibility TLV comprises an IP reachability information ITEM, IP reachability information ITEM is 1.1.1.0/24, and comprise a sub-TLV of reachability information administrative distance, the sub-TLV of reachability information administrative distance represents that the administrative distance of the IP reachability information of 1.1.1.0/24 is 100,100 so will be used to be added in routing table as the administrative distance of this route 1.1.1.0/24, although ISIS now consultative management distance is 115, finally achieve the network planning.
In addition, it should be noted that, the specific embodiment described in this specification, the shape, institute's title of being named etc. of its parts and components can be different.All equivalences of doing according to structure, feature and the principle described in inventional idea of the present invention or simple change, be included in the protection range of patent of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (6)
1. Intermediate System to Intermediate System specified circuit is by a method for administrative distance, it is characterized in that comprising:
A. setting party's intermediate system IS notices the administrative distance of a reachability information IP by a sub-TLV of reachability information;
B. intermediate system IS in the side's of calculating receives the administrative distance that setting party's intermediate system IS is arranged described reachability information IP;
C. described reachability information IP is calculated described reachability information IP route according to described administrative distance.
2. a kind of Intermediate System to Intermediate System specified circuit according to claim 1 is by the method for administrative distance, it is characterized in that: namely described setting party's intermediate system and setting party IS are exactly the sub-TLV of newly-increased a kind of protocol type by the administrative distance of reachability information TLV advertises reachability information IP, and this sub-TLV is called the sub-TLV of reachability information administrative distance.
3. a kind of Intermediate System to Intermediate System specified circuit according to claim 2 is by the method for administrative distance, it is characterized in that: the sub-TLV of described reachability information administrative distance is kept in the reachability information entry ITEM of IP width extent reachability information TLV, what namely represent is the administrative distance of this IP reachability data entries, and an IP width extent reachability information TLV comprises at least one reachability information entry ITEM.
4. a kind of Intermediate System to Intermediate System specified circuit according to claim 2 is by the method for administrative distance, it is characterized in that: comprise the sub-TLV of reachability information administrative distance described at least one in a reachability information IP entry ITEM, then first sub-TLV of described reachability information administrative distance works.
5. a kind of Intermediate System to Intermediate System specified circuit according to claim 1 is by the method for administrative distance, it is characterized in that: described setting party's intermediate system IS is by the administrative distance of reachability information TLV advertises reachability information IP, it comprises: described setting party's intermediate system IS will specify the administrative distance of reachability information IP, a sub-TLV of reachability information administrative distance is comprised in the reachability information IP entry ITEM of IP width extent reachability information TLV, the sub-TLV of reachability information administrative distance specifies administrative distance, last then this IP width extent reachability information TLV can be filled in LSP and notice.
6. a kind of Intermediate System to Intermediate System specified circuit according to claim 1 is by the method for administrative distance, it is characterized in that: after the side of calculating intermediate system IS receives the administrative distance that setting party's intermediate system IS arranges described IP reachability information, described IP reachability information is calculated this IP reachability information router according to described administrative distance, this process comprises: described calculating side intermediate system IS receives described setting party's intermediate system IS LSP, if detect in an IP reachability information ITEM in IP width extent reachability information TLV and comprise a sub-TLV of reachability information administrative distance, the sub-TLV of reachability information administrative distance then specifies the administrative distance of this IP reachability information, this route is added in routing table, administrative distance is the administrative distance value that the sub-TLV of reachability information administrative distance specifies, the impact of the consultative management distance not totally arranged by ISIS agreement.
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