The Type. 1 the LSA: Router the LSA
. 1, Reach: only in the region
2, advertised by: each router (router-id identified as)
3, content: routing and topology information
Show Database IP OSPF route
the LSA the Type 2: the LSA the Network (MA appears in the network)
1, Reach: only in the region
2, advertised by: the DR announcement
3, content: topology mask
Show IP network Database OSPF
the LSA the Type 3: the LSA the Summary
1, Reach: the autonomous system
2 , by Notice: the ABR
. 3, content: inter-domain routing
the LSA the Type. 4: the ASB the LSA the Summary
. 1, except that the propagation range :( region where ASBR)
2, advertised by: the ABR
. 3, content: tell the position where the other regions ASBR
LSA Type 5 : External LSA (produced by redistribution)
1, Reach: ospf entire region
2, advertised by: the ASBR (advertisement's constant)
3, content: route outside
ip ospf border-Routers Show
Link ID ADV Router
LSA1 RID RID
LSA2 DR's IP DR's RID
LSA3 Route ABR's RID
LSA4 ABR ASBR's RID's RID (cross ABR ABR will be marked with the RID)
LSA5 Route (E) ASBR's RID
LSDB Overload Protection 负载保护
ip ospf cost interface-cost
auto-cost reference-bandwidth ref-bw
OSPF 110 Router
Area #. 1 is provided on the stub and stub the ASBR the ABR
Area stub cost. 1 modified cost value. 5 #
area 1 stub no-summary # completely made only to stub on the ABR
Area # 2 on both ends with NSSA
area 2 nssa default -information-originate # must be manually go with
show ip ospf border-routers # long as a Category 5 is the routing capability ASBR
Injecting a default route to ospf region
area 2 nssa default-information-originate
whether been delegated default route
Stub filter LSA4 / 5 is (LSA3) Seed Cost =. 1
the Totally Stub1 filtered LSA3 / 4/5 is (LSA3) Seed Cost =. 1
the NSSA filter LSA4 / 5 No (DeFu: LSA7) Cost = 1
the Totally the NSSA filtered LSA3 / 4/5 is (no-su: LSA) Cost = 1
solution irregular areas:
1, multi-process bi redistribution
2, tunnel
OSP neighbor Troubleshooting
1, router-id
adjacent neighbor relationship is not
a non-adjacent device in the same area (the routing table is not loaded)
2, the Hello time and the time of death related to the type of network OSPF] [
10S + 4OS
30S + 120S
or removed; or adjust
3, the same link in the same region
4, DR does not affect the priority neighbor establishment
may affect delivery route
5, authentication (password authentication type and authentication)
. 6, MA (broadcast) network, the same mask
a, a mask B consistent, point to multi- point network
int E0 / 2
IP network OSPF point-to-mutipoint
. 7, the MTU inconsistencies
Parameters (DOWN / exstart / exchange) when checking DBD packets
smaller MTU-OSPF interface configuration the ignore IP
. 8, not in direct connection port passive
================= ====================
neighbor establishment process:
DOWN
(attempt)
the Init
Two-Way
the Exstrart
the Exchange
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