rfc1247.ps

著名的RFC文档,其中有一些文档是已经翻译成中文的的.

0 312 p (There)s
14(will)m
15(be)m
14 r 97 c
14(new)m
15(section)m
14(discussing)m
14(premature)m
15(aging)m
14(\(Section)m
14(14.1\).)m
26(This)m
14(is)m
15 r 97 c
14(method)m
14(for)m
15(\015ushing)m
14 r 97 c
14(link)m
15(state)m
0 361 p (advertisement)s
10(from)m
10(the)m
10(routing)m
10(domain:)m
14(the)m
10(advertisement')m
-1 r 115 c
9(age)m
10(is)m
10(set)m
11(to)m
10(MaxAge)m
10(and)m
10(advertisement)m
10(is)m
10(re\015ooded)m
10(just)m
0 411 p (as)s
14(if)m
14(it)m
15(were)m
14 r 97 c
14(newly)m
14(received)m
14(advertisement.)m
26(As)m
14(soon)m
14(as)m
14(the)m
14(new)m
15(\015ooding)m
14(is)m
14(acknowledged)m
14(by)m
14(all)m
14(of)m
15(the)m
14(router)m
1 r 39 c
-1 r 115 c
0 461 p (adjacent)s
10(neighbors,)m
11(the)m
10(advertisement)m
11(is)m
10(\015ushed)m
10(from)m
11(the)m
10(database.)m
0 528 p (Premature)s
10(aging)m
9(can)m
10(also)m
10(be)m
9(used)m
10(when,)m
10(for)m
10(example,)m
9 r 97 c
10(previously)m
10(advertised)m
9(external)m
10(route)m
10(is)m
9(no)m
10(longer)m
10(reachable.)m
13(In)m
0 577 p (this)s
12(circumstance,)m
12(premature)m
12(aging)m
11(is)m
12(preferable)m
12(to)m
12(the)m
11(alternative,)m
12(which)m
12(is)m
12(to)m
12(originate)m
11 r 97 c
12(new)m
12(advertisement)m
12(for)m
11(the)m
0 627 p (destination)s
10(specifying)m
11 r 97 c
10(metric)m
11(of)m
10(LSIn\014nity)m
-2 r 46 c
0 694 p 65 c
11(router)m
10(may)m
11(only)m
10(prematurely)m
11(age)m
10(its)m
11(own)m
10(\(self-originated\))m
11(link)m
10(state)m
11(advertisements.)m
14(These)m
11(are)m
10(the)m
11(link)m
10(state)m
11(adver-)m
0 744 p (tisements)s
10(having)m
11(the)m
10(router)m
2 r 39 c
-2 r 115 c
10(own)m
10(OSPF)m
11(router)m
10(ID)m
11(in)m
10(the)m
t-bol.300 @sf 10(Advertising)m
11(Router)m
t-rom.300 @sf 10(\014eld.)m
t-bol.300 @sf 0 871 p 70 c
-3(.2.2)m
41(Flooding)m
10(of)m
11(unexpected)m
10(MaxAge)m
10(advertisements)m
t-rom.300 @sf 0 965 p 86 c
-4(ersion)m
11 r 49 c
13(of)m
12(the)m
12(OSPF)m
12(omitted)m
12(the)m
12(handling)m
12(of)m
12 r 97 c
12(special)m
12(case)m
12(in)m
12(the)m
12(\015ooding)m
12(procedure:)m
18(the)m
12(reception)m
12(of)m
12 r 97 c
12(MaxAge)m
0 1015 p (advertisement)s
11(that)m
11(has)m
12(no)m
11(database)m
11(instance.)m
17 r 65 c
11(paragraph)m
11(has)m
11(been)m
11(added)m
12(to)m
11(Section)m
11(13)m
11(to)m
12(deal)m
11(with)m
11(this)m
11(occurrence.)m
0 1065 p 87 c
-1(ithout)m
10(this)m
10(paragraph,)m
10(retransmissions)m
11(of)m
10(MaxAge)m
11(advertisements)m
10(could)m
10(possibly)m
11(delay)m
10(their)m
10(being)m
11(\015ushed)m
10(from)m
11(the)m
0 1115 p (routing)s
10(domain.)m
t-bol.300 @sf 0 1242 p 70 c
-3(.2.3)m
41 r 86 c
-1(irtual)m
10(links)m
10(and)m
11(addr)m
(ess)s
9(ranges)m
t-rom.300 @sf 0 1336 p (When)s
14(summarizing)m
15(information)m
14(into)m
14 r 97 c
14(virtual)m
15(link')m
-2 r 115 c
13(transit)m
15(area,)m
15(version)m
14 r 50 c
14(of)m
15(the)m
14(OSPF)m
14(speci\014cation)m
14(prohibits)m
15(the)m
0 1386 p (collapsing)s
12(of)m
12(multiple)m
12(backbone)m
12(IP)m
11(networks/subnets)m
12(into)m
12 r 97 c
12(single)m
12(summary)m
12(link.)m
18(This)m
12(restriction)m
12(has)m
12(been)m
12(added)m
12(to)m
0 1436 p (deal)s
10(with)m
11(certain)m
10(anomalous)m
11(OSPF)m
10(area)m
10(con\014gurations.)m
14(See)m
11(Sections)m
10(15)m
11(and)m
10(12.4.3)m
10(for)m
11(more)m
10(information.)m
t-bol.300 @sf 0 1563 p 70 c
-3(.2.4)m
41(Routing)m
10(table)m
11(lookup)m
10(explained)m
t-rom.300 @sf 0 1657 p (When)s
10(forwarding)m
10(an)m
10(IP)m
9(data)m
10(packet,)m
10 r 97 c
10(router)m
10(looks)m
10(up)m
10(the)m
9(packet')m
-1 r 115 c
9(IP)m
10(destination)m
10(in)m
10(the)m
9(routing)m
10(table.)m
14(This)m
10(determines)m
0 1707 p (the)s
13(packet')m
-2 r 115 c
12(next)m
12(hop.)m
21 r 65 c
12(new)m
13(section)m
13(\(Section)m
12 r 49 c
(1.1\))s
11(has)m
13(been)m
12(added)m
13(describing)m
13(the)m
12(routing)m
13(table)m
12(lookup)m
13(\(instead)m
12(of)m
0 1757 p (just)s
11(specifying)m
11 r 97 c
12(\\best)m
11(match"\).)m
16(This)m
11(section)m
11(clari\014es)m
12(OSPF')m
-2 r 115 c
11(four)m
11(level)m
11(routing)m
11(hierarchy)m
11(\(i.e.,)m
12(intra-area,)m
11(inter)m
(-area,)s
0 1807 p (external)s
10(type)m
11 r 49 c
10(and)m
11(external)m
10(type)m
10 r 50 c
11(routes\).)m
14(It)m
10(also)m
11(speci\014es)m
10(the)m
10(ef)m
(fect)s
10(of)m
11 r 84 c
(OS)s
9(on)m
11(routing.)m
t-bol.300 @sf 0 1934 p 70 c
-3(.2.5)m
41(Sending)m
10(Link)m
11(State)m
10(Request)m
10(packets)m
t-rom.300 @sf 0 2028 p (OSPF)s
11 r 86 c
-3(ersion)m
10 r 50 c
12(eases)m
11(the)m
11(restrictions)m
12(on)m
11(the)m
12(sending)m
11(of)m
11(Link)m
12(State)m
11(Request)m
12(packets.)m
16(Link)m
12(State)m
11(Request)m
12(packets)m
11(can)m
0 2078 p (now)s
9(be)m
9(sent)m
9(to)m
10 r 97 c
9(neighboring)m
9(router)m
9(before)m
9 r 97 c
9(complete)m
10(set)m
9(of)m
9(Database)m
9(Description)m
9(packets)m
9(have)m
10(been)m
9(exchanged.)m
13(This)m
0 2128 p (enables)s
10 r 97 c
11(more)m
10(ef)m
(\014cient)s
9(use)m
11(of)m
10 r 97 c
10(router)m
2 r 39 c
-2 r 115 c
10(memory)m
10(resources;)m
10(an)m
10(OSPF)m
11(version)m
10 r 50 c
10(implementation)m
10(may)m
11(limit)m
10(the)m
10(size)m
10(of)m
0 2178 p (the)s
10(neighbor)m
t-bol.300 @sf 11(Link)m
10(state)m
11 r 114 c
(equest)s
9(lists)m
t-rom.300 @sf 46 c
14(See)m
11(Sections)m
10(10.9,)m
10(10.7)m
11(and)m
10(10.3)m
11(for)m
10(more)m
11(details.)m
t-bol.300 @sf 0 2305 p 70 c
-3(.2.6)m
41(Changes)m
10(to)m
11(the)m
10(Database)m
10(description)m
11(pr)m
(ocess)s
t-rom.300 @sf 0 2399 p (The)s
14(speci\014cation)m
14(has)m
14(been)m
15(modi\014ed)m
14(to)m
14(ensure)m
14(that,)m
15(when)m
14(two)m
14(routers)m
14(are)m
14(synchronizing)m
15(their)m
14(databases)m
14(during)m
14(the)m
0 2449 p (Database)s
15(Description)m
16(process,)m
16(none)m
15(of)m
16(the)m
15(component)m
15(link)m
16(state)m
15(advertisements)m
15(can)m
16(have)m
15(their)m
15(sequence)m
15(numbers)m
0 2499 p (decrease.)s
25 r 65 c
13(link)m
14(state)m
14(advertisement')m
-1 r 115 c
13(sequence)m
14(number)m
14(decreases)m
14(when)m
14(it)m
14(is)m
14(\015ushed)m
14(from)m
14(the)m
14(routing)m
14(domain)m
14(via)m
0 2549 p (premature-aging,)s
11(and)m
11(then)m
10(reoriginated)m
11(with)m
11(the)m
11(smallest)m
11(sequence)m
10(number)m
c-med.300 @sf 11(0x80000001)m
t-rom.300 @sf 11(\(see)m
11(Section)m
10(14.1\).)m
15(So)m
11(the)m
0 2599 p (speci\014cation)s
12(now)m
11(dictates)m
12(that)m
11(an)m
12(advertisement)m
11(cannot)m
12(be)m
11(\015ushed)m
12(from)m
12 r 97 c
11(router)m
2 r 39 c
-2 r 115 c
11(database)m
11(until)m
12(both)m
12(a\))m
11(it)m
12(no)m
11(longer)m
0 2723 p ([J.)s
10(Moy])m
1625([Page)m
11(121])m
@eop
120 @bop0
120 @bop1
t-rom.300 @sf 0 50 p (RFC)s
10(1247)m
673(OSPF)m
11 r 86 c
-4(ersion)m
9 r 50 c
673(July)m
11(1991)m
0 195 p 88 c
11(from)m
11(the)m
11(calculation.)m
15(In)m
11(ef)m
(fect,)s
10(an)m
11(attempt)m
11(will)m
10(be)m
11(made)m
11(to)m
11(bypass)m
11(router)m
11 r 88 c
11(when)m
10(forwarding)m
11(non-zero)m
11 r 84 c
(OS)s
10(traf)m
(\014c.)s
0 245 p (Summary)s
13(link)m
12(and)m
13(AS)m
13(external)m
12(link)m
13(advertisements)m
13(can)m
12(also)m
13(indicate)m
13(their)m
12(non-availability)m
13(for)m
13(non-zero)m
13 r 84 c
(OS)s
11(traf)m
(\014c)s
0 295 p (\(Sections)s
10(12.4.3)m
11(and)m
10(12.4.4\).)m
0 362 p (The)s
9(result)m
9(may)m
9(be)m
9(that)m
9(no)m
9(route)m
9(can)m
9(be)m
9(found)m
9(for)m
9(some)m
9(non-zero)m
9(value)m
9(of)m
9 r 84 c
(OS.)s
9(When)m
9(this)m
9(happens,)m
9(the)m
9(packet)m
9(is)m
9(routed)m
0 412 p (along)s
10(the)m
11 r 84 c
(OS)s
9 r 48 c
11(route)m
10(instead)m
11(\(Section)m
10 r 49 c
(1.1\).)s
0 480 p (It)s
11(is)m
11(still)m
10(mandatory)m
11(for)m
11(all)m
11(OSPF)m
10(implementations)m
11(to)m
11(be)m
11(able)m
10(to)m
11(construct)m
11(separate)m
11(routing)m
10(tables)m
11(for)m
11(each)m
11 r 84 c
(OS)s
10(value,)m
0 530 p (if)s
10(desired)m
11(by)m
10(the)m
11(system)m
10(administrator)m
-1 r 46 c
t-bol.300 @sf 0 658 p 70 c
-3(.1.3)m
41(Pr)m
(eventing)s
9(external)m
11(extra-hops)m
t-rom.300 @sf 0 754 p (In)s
16(some)m
15(cases,)m
17(version)m
15 r 49 c
16(of)m
16(the)m
15(OSPF)m
16(speci\014cation)m
15(will)m
16(introduce)m
15(extra-hops)m
16(when)m
15(calculating)m
16(routes)m
15(to)m
16(external)m
0 804 p (destinations.)s
13(This)m
8(is)m
8(because)m
8(it)m
8(is)m
9(implicit)m
8(in)m
8(the)m
8(format)m
8(of)m
8(AS)m
8(external)m
8(advertisements)m
8(that)m
8(packets)m
8(should)m
8(be)m
8(forwarded)m
0 853 p (through)s
13(the)m
13(advertising)m
13(router)m
-1 r 46 c
21(However)m
-1 r 44 c
13(consider)m
13(the)m
13(situation)m
13(where)m
13(multiple)m
13(OSPF)m
13(routers)m
13(share)m
13 r 97 c
13(LAN)m
13(with)m
13(an)m
0 903 p (external)s
12(router)m
11(\(call)m
12(it)m
11(router)m
12(Y\))m
11 r 44 c
12(and)m
11(only)m
12(one)m
12(OSPF)m
11(router)m
12(\(call)m
11(it)m
12(router)m
11(X\))m
12(exchanges)m
11(routing)m
12(information)m
12(with)m
11 r 89 c
-4 r 46 c
0 953 p (The)s
10(OSPF)m
10(routers)m
10(on)m
9(the)m
10(LAN)m
10(other)m
10(than)m
10 r 88 c
10(will)m
9(forward)m
10(packets)m
10(destined)m
10(for)m
10 r 89 c
10(and)m
9(beyond)m
10(through)m
10(X,)m
10(generating)m
10(an)m
0 1003 p (extra)s
10(hop)m
11(\(see)m
10(Section)m
11(2.2\).)m
0 1070 p 84 c
-2 r 111 c
13(\014x)m
13(this,)m
14 r 97 c
14(new)m
13(\014eld)m
14(has)m
13(been)m
13(added)m
14(to)m
13(AS)m
14(external)m
13(advertisements.)m
23(This)m
14(\014eld)m
13(\(called)m
14(the)m
t-bol.300 @sf 13(forwarding)m
14(addr)m
(ess)s
t-rom.300 @sf 41 c
0 1120 p (will)s
11(indicate)m
11(the)m
11(router)m
11(address)m
11(to)m
12(which)m
11(packets)m
11(should)m
11(be)m
11(forwarded)m
11(\(Section)m
11(12.4.4\).)m
16(In)m
11(the)m
11(above)m
11(example,)m
11(router)m
0 1170 p 88 c
13(will)m
13(put)m
13(Y')m
-1 r 115 c
12(IP)m
13(address)m
13(into)m
14(this)m
13(\014eld.)m
22(If)m
13(the)m
13(\014eld)m
13(is)m
13(0,)m
14(packets)m
13(are)m
13(\(as)m
13(before\))m
14(forwarded)m
13(to)m
13(the)m
13(originator)m
13(of)m
13(the)m
0 1220 p (advertisement.)s
14 r 65 c
10(dif)m
(ferent)s
t-bol.300 @sf 10(forwarding)m
10(addr)m
(ess)s
t-rom.300 @sf 10(can)m
10(be)m
11(speci\014ed)m
10(for)m
11(each)m
10 r 84 c
(OS)s
10(value.)m
0 1288 p (Whenever)s
14(possible,)m
16(this)m
14(new)m
15(\014eld)m
14(should)m
15(be)m
14(set)m
15(to)m
14(0.)m
26(This)m
15(is)m
14(because)m
15(setting)m
14(it)m
15(to)m
14(an)m
15(actual)m