rfc1195.ps

RFC 的详细文档！

143.8 0 32 (ments. In addition, this approach allows interconnection of dual \(IP and OSI\) routing domains) W
0 -28072 M
(with other dual domains, with IP\255only domains, and with OSI\255only domains.) h
0 -30615 M
(The protocol specified here is based on the work of the IETF IS\255IS working group.) h
0 -33308 M
/Times-Bold-ISOLatin1 F 1400 o f
(1.1 ) h
2126 -33308 M
(What the Integrated IS\255IS offers) h
0 -36251 M
/Times-Roman-ISOLatin1 F 1200 o f
0.2 0 32 (The integrated IS\255IS provides a single routing protocol which will simultaneously provide an effi\255) W
0 -37501 M
89.7 0 32 (cient routing protocol for TCP/IP, and for OSI. This design makes use of the OSI IS\255IS routing) W
0 -38751 M
163.8 0 32 (protocol, augmented with IP\255specific information. This design provides explicit support for IP) W
0 -40001 M
133.6 0 32 (subnetting, variable subnet masks, TOS\255based routing, and external routing. There is provision) W
0 -41251 M
58.8 0 32 (for authentication information, including the use of passwords or other mechanisms. The precise) W
0 -42501 M
107.5 0 32 (form of authentication mechanisms \(other than passwords\) is outside of the scope of this docu\255) W
0 -43751 M
(ment.) h
0 -46294 M
73.2 0 32 (Both OSI and IP packets are forwarded ) W
73.2 0 32 (\026) W
73.2 0 32 (as is) W
73.2 0 32 (\027) W
73.2 0 32 ( ) W
73.2 0 32 (\002) W
73.2 0 32 ( i.e., they are transmitted directly over the un\255) W
0 -47544 M
81.4 0 32 (derlying link layer services without the need for mutual encapsulation. The integrated IS\255IS is a) W
0 -48794 M
(dynamic routing protocol, based on the SPF \(Dijkstra\) routing algorithm. ) h
0 -51337 M
50.2 0 32 (The protocol described in this specification allows for mixing of IP\255only, OSI\255only, and dual \(IP) W
0 -52587 M
(and OSI\) routers, as defined below. ) h
0 -55130 M
13.5 0 32 (An IP\255only IS\255IS router \(or ) W
13.5 0 32 (\026) W
13.5 0 32 (IP\255only) W
13.5 0 32 (\027) W
13.5 0 32 ( router\) is defined to be a router which: \(i\) Uses IS\255IS as the) W
0 -56380 M
29.4 0 32 (routing protocol for IP, as specified in this report; and \(ii\) Does not otherwise support OSI proto\255) W
0 -57630 M
(cols. For example, such routers would not be able to forward OSI CLNP packets.) h
-8502 8501 T
R

showpage
$P e

/$P a D
g N
0 79200 T
S
S
8642 -3084 T
N
0 G
0 -900 M
/Helvetica-ISOLatin1 $
/Helvetica & P
/Helvetica-ISOLatin1 F 1200 o f
(RFC 1195) h
15164 -900 M
(OSI ISIS for IP and Dual Environments) h
38169 -900 M
(December, 1990) h
0 -2337 M
-8642 3084 T
R

S
8642 -68833 T
N
0 G
0 -900 M
/Helvetica-ISOLatin1 F 1200 o f
(Callon) h
25502 -900 M
43237 -900 M
(Page ) h
(2) h
0 -2337 M
-8642 68833 T
R

R
S
8502 -8501 T
N
0 G
0 -900 M
/Times-Roman-ISOLatin1 $
/Times-Roman & P
/Times-Roman-ISOLatin1 F 1200 o f
48.4 0 32 (An OSI\255only router is defined to be a router which uses IS\255IS as the routing protocol for OSI, as) W
0 -2150 M
81.5 0 32 (specified in [1]. Generally, OSI\255only routers may be expected to conform to OSI standards, and) W
0 -3400 M
(may be implemented independent of this specification.) h
0 -5735 M
63.7 0 32 (A dual IS\255IS router \(or ) W
63.7 0 32 (\026) W
63.7 0 32 (dual) W
63.7 0 32 (\027) W
63.7 0 32 ( router\) is defined to be a router which uses IS\255IS as a single inte\255) W
0 -6985 M
(grated routing protocol for both IP and OSI, as specified in this report.) h
0 -9320 M
54.8 0 32 (This approach does not change the way that IP packets are handled. IP\255only and dual routers are) W
0 -10570 M
85.3 0 32 (required to conform to the requirements of Internet Gateways [4]. The integrated IS\255IS protocol) W
0 -11820 M
113.2 0 32 (described in this report outlines an Interior Gateway Protocol \(IGP\) which will provide routing) W
0 -13070 M
75.1 0 32 (within a TCP/IP routing domain \(i.e., autonomous system\). Other aspects of router functionality) W
0 -14320 M
(\(e.g., operation of ICMP, ARP, EGP, etc.\) are not affected by this proposal.) h
0 -16655 M
52.5 0 32 (Similarly, this approach does not change the way that OSI packets are handled. There will be no) W
0 -17905 M
26.3 0 32 (change at all to the contents nor to the handling of ISO 8473 Data packets and Error Reports, nor) W
0 -19155 M
129.2 0 32 (to ISO 9542 Redirects and ES Hellos.  ISO 9542 IS Hellos transmitted on LANs are similarly) W
0 -20405 M
64.4 0 32 (unchanged. ISO 9542 IS Hellos transmitted on point\255to\255point links are unchanged except for the) W
0 -21655 M
157.8 0 32 (addition of IP\255related information. Similarly, other OSI packets \(specifically those involved in) W
0 -22905 M
97.8 0 32 (the IS\255IS intra\255domain routing protocol\) remain unchanged except for the addition of IP\255related) W
0 -24155 M
(information. ) h
0 -26490 M
0.5 0 32 (This approach makes use of the existing IS\255IS packets, with IP\255specific fields added. Specifically:) W
0 -27740 M
88.4 0 32 (\(i\) authentication information may be added to all IS\255IS packets; \(ii\) the protocols supported by) W
0 -28990 M
18.2 0 32 (each router, as well as each router's IP addresses, are specified in ISO 9542 IS Hello, IS\255IS Hello) W
0 -30240 M
9.3 0 32 (and Link State Packets; \(iii\) internally reachable IP addresses are specified in all Link State Pack\255) W
0 -31490 M
31.4 0 32 (ets; and \(iv\) externally reachable IP addresses, and external routing protocol information, may be) W
0 -32740 M
57.5 0 32 (specified in level 2 Link State Packets. The detailed encoding and interpretation of this informa\255) W
0 -33990 M
(tion is specified in sections 3, 4, and 5 of this RFC.) h
0 -36325 M
127.3 0 32 (The protocol described in this report may be used to provide routing in an IP\255only routing do\255) W
0 -37575 M
2.1 0 32 (main, in which all routers are IP\255only. Similarly, this protocol may be used to provide routing in a) W
0 -38825 M
154.3 0 32 (pure dual domain, in which all routers are dual. Finally, this protocol may be used to provide) W
0 -40075 M
118.1 0 32 (routing in a mixed domain, in which some routers are IP\255only, some routers are OSI\255only, and) W
0 -41325 M
47.2 0 32 (some routers are dual. The specific topological restrictions which apply in this latter case are de\255) W
0 -42575 M
35.8 0 32 (scribed in detail in section ) W
35.8 0 32 (1.4 \() W
35.8 0 32 (\026) W
35.8 0 32 (Support of Mixed Routing Domains) W
35.8 0 32 (\027) W
35.8 0 32 (\). The use of IS\255IS for sup\255) W
0 -43825 M
(port of pure OSI domains is specified in [1].) h
0 -46160 M
170.2 0 32 (This protocol specification does not constrain which network management protocol\(s\) may be) W
0 -47410 M
173.4 0 32 (used to manage IS\255IS\255based routers. Management information bases \(MIBs\) for managing IP\255) W
0 -48660 M
82.2 0 32 (only, OSI\255only, and dual routers, compatible with CMIP, CMOT, and/or SNMP, are the subject) W
0 -49910 M
(of a separate, companion document [8].) h
0 -52395 M
/Times-Bold-ISOLatin1 $
/Times-Bold & P
/Times-Bold-ISOLatin1 F 1400 o f
(1.2 ) h
2126 -52395 M
(Overview of the ISO IS\255IS Protocol) h
0 -55130 M
/Times-Roman-ISOLatin1 F 1200 o f
62.5 0 32 (The IS\255IS Routing Protocol has been developed in ISO to provide routing for pure OSI environ\255) W
0 -56380 M
75.7 0 32 (ments. In particular, IS\255IS is designed to work in conjunction with ISO 8473 \(The ISO Connec\255) W
0 -57630 M
81.2 0 32 (tionless Network Layer Protocol [2]\), and ISO 9542 \(The ISO End System to Intermediate Sys\255) W
-8502 8501 T
R

showpage
$P e

/$P a D
g N
0 79200 T
S
S
8642 -3084 T
N
0 G
0 -900 M
/Helvetica-ISOLatin1 $
/Helvetica & P
/Helvetica-ISOLatin1 F 1200 o f
(RFC 1195) h
15164 -900 M
(OSI ISIS for IP and Dual Environments) h
38169 -900 M
(December, 1990) h
0 -2337 M
-8642 3084 T
R

S
8642 -68833 T
N
0 G
0 -900 M
/Helvetica-ISOLatin1 F 1200 o f
(Callon) h
25502 -900 M
43237 -900 M
(Page ) h
(3) h
0 -2337 M
-8642 68833 T
R

R
S
8502 -8501 T
N
0 G
0 -900 M
/Times-Roman-ISOLatin1 $
/Times-Roman & P
/Times-Roman-ISOLatin1 F 1200 o f
158.0 0 32 (tem Protocol [3]\). This section briefly describes the manner in which IS\255IS is used to support) W
0 -2160 M
195.0 0 32 (pure OSI environments. Enhancements for support of IP and dual environments are specified) W
0 -3420 M
(elsewhere in this report.) h
0 -6280 M
113.2 0 32 (In IS\255IS, the network is partitioned into ) W
113.2 0 32 (\026) W
113.2 0 32 (routing domains) W
113.2 0 32 (\027) W
113.2 0 32 (. The boundaries of routing domains) W
0 -7540 M
177.5 0 32 (are defined by network management, by setting some links to be ) W
177.5 0 32 (\026) W
177.5 0 32 (exterior links) W
177.5 0 32 (\027) W
177.5 0 32 (. If a link is) W
0 -8800 M
(marked as ) h
(\026) h
(exterior) h
(\027) h
(, no IS\255IS routing messages are sent on that link.) h
0 -11660 M
55.3 0 32 (Currently, ISO does not have a standard for inter\255domain routing \(i.e., for routing between sepa\255) W
0 -12920 M
133.5 0 32 (rate autonomous routing domains\). Instead, manual configuration is used. The link is statically) W
0 -14180 M
33.8 0 32 (configured with the set of address prefixes reachable via that link, and with the method by which) W
0 -15440 M
76.1 0 32 (they can be reached \(such as the DTE address to be dialed to reach that address, or the fact that) W
0 -16700 M
(the DTE address should be extracted from the IDP portion of the ISO address\). ) h
0 -19560 M
125.9 0 32 (OSI IS\255IS routing makes use of two\255level hierarchical routing. A routing domain is partitioned) W
0 -20820 M
98.5 0 32 (into ) W
98.5 0 32 (\026) W
98.5 0 32 (areas) W
98.5 0 32 (\027) W
98.5 0 32 (. Level 1 routers know the topology in their area, including all routers and end sys\255) W
0 -22080 M
123.2 0 32 (tems in their area. However, level 1 routers do not know the identity of routers or destinations) W
0 -23340 M
65.3 0 32 (outside of their area. Level 1 routers forward all traffic for destinations outside of their area to a) W
0 -24600 M
41.4 0 32 (level 2 router in their area. Similarly, level 2 routers know the level 2 topology, and know which) W
0 -25860 M
28.2 0 32 (addresses are reachable via each level 2 router. However, level 2 routers do not need to know the) W
0 -27120 M
76.9 0 32 (topology within any level 1 area, except to the extent that a level 2 router may also be a level 1) W
0 -28380 M
20.5 0 32 (router within a single area. Only level 2 routers can exchange data packets or routing information) W
0 -29640 M
(directly with external routers located outside of the routing domains. ) h
11583 -44738 M
/Times-Bold-ISOLatin1 $
/Times-Bold & P
/Times-Bold-ISOLatin1 F 1200 o f
(Figure 1 \255 ) h
16882 -44738 M
(ISO Hierarchical Address Structure) h
0 -47548 M
/Times-Roman-ISOLatin1 F 1200 o f
111.3 0 32 (As illustrated in figure ) W
111.3 0 32 (1, ISO addresses are subdivided into the Initial Domain Part \(IDP\), and) W
0 -48808 M
39.9 0 32 (the Domain Specific Part \(DSP\). The IDP is the part which is standardized by ISO, and specifies) W
0 -50068 M
21.1 0 32 (the format and authority responsible for assigning the rest of the address. The DSP is assigned by) W
0 -51328 M
224.1 0 32 (whatever addressing authority is specified by the IDP. The DSP is further subdivided into a) W
0 -52588 M
20.6 0 32 (\026) W
20.6 0 32 (High Order Part of DSP) W
20.6 0 32 (\027) W
20.6 0 32 ( \(HO\255DSP\), a system identifier \(ID\), and an NSAP selector \(SEL\). The) W
0 -53848 M
84.7 0 32 (HO\255DSP may use any format desired by the authority which is identified by the IDP. Together,) W
0 -55108 M
15.7 0 32 (the combination of [IDP, HO\255DSP] identify both the routing domain and the area within the rout\255) W
0 -56368 M
122.2 0 32 (ing domain. The combination of [IDP,HO\255DSP] may therefore be referred to as the ) W
122.2 0 32 (\026) W
122.2 0 32 (Area Ad\255) W
0 -57628 M
(dress) h
(\027) h
(. ) h
-8502 8501 T
S
N
S
11746 -52339 40542 12238 @ I N
11746 -40101 T
S
0 -12238 40542 12238 @
S
0.00 G - + * E
R
R
N
S
N
24543.00 -30.00 M
40456.00 -7412.00 L
11504.00 -7316.00 L
12942.00 -30.00 L
24830.00 -2714.00 L
H
S
0.50 G - + * E
R
R

S
N
6360.00 -223.00 M
94.00 -7317.00 L
9801.00 -7413.00 L
9801.00 -10098.00 L
12751.00 -3003.00 L
H
S
0.50 G - + * E
R
R

S
6379 -2912 6344 2701 @
S
0.00 G - + * E
R
S
150 w
0 c
0 j
0.00 G k
R
R

S
735 -9193 M
/Courier-Bold-ISOLatin1 $
/Courier-Bold & P
/Courier-Bold-ISOLatin1 F 1153 o f
(AFI) h
R

S
47 -10112 3448 2700 @
S
150 w
0 c
0 j
0.00 G k
R
R

S
5631 -9193 M
/Courier-Bold-ISOLatin1 F 1153 o f
(IDI) h
R

S
3495 -10112 6344 2700 @
S
150 w
0 c
0 j
0.00 G k
R
R

S
27814 -9127 M
/Courier-Bold-ISOLatin1 F 1154 o f
(ID) h
R

S
19987 -10112 16971 2700 @
S
150 w
0 c
0 j
0.00 G k
R
R

S
37646 -9193 M
/Courier-Bold-ISOLatin1 F 1153 o f
(SEL) h
R

S
36958 -10112 3449 2700 @
S
150 w
0 c
0 j
0.00 G k
R
R

S
1189 -11672 M
/Helvetica-ISOLatin1 F 800 o f
(1) h
R