Avaya Configuring IP, ARP, RIP, and OSPF Services Uživatelský manuál Strana 34
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Hodnocené. / 5. Na základě hodnocení zákazníků
Configuring IP, ARP, RIP, and OSPF Services
1-12
117356-E Rev 00
Open Shortest Path First (OSPF) Protocol
The Open Shortest Path First (OSPF) protocol is an interior gateway protocol
(IGP) intended for use in large networks. Using a link state algorithm, OSPF
exchanges routing information between routers in an autonomous system. Routers
synchronize their topological databases. After the routers are synchronized and
the routing tables are built, the routers flood topology information only in
response to some topological change. For OSPF, the “best” path to a destination is
the path that offers the least cost metric delay. In OSPF, cost metrics are
configurable, allowing you to specify preferred paths.
OSPF is a link-state protocol. A router running a link-state protocol periodically
tests the status of the physical connection to each of its neighbor routers and sends
this information to its other neighbors. A link-state protocol does not require each
router to send its entire routing table to its neighbors. Instead, each OSPF router
floods only link-state change information throughout the autonomous system (or
area, if the AS is divided into areas). This process is referred to as the
synchronization of the routers’ topological databases.
With the link-state information, each router builds a shortest-path tree with itself
as the root of the tree. It can then identify the shortest path from itself to each
destination and build its routing table.
OSPF supports CIDR and can carry supernet advertisements within a routing
domain.
OSPF Addresses and Variable-Length Masks
A destination in an OSPF route advertisement is expressed as an IP address and a
variable-length mask. Together, the address and the mask indicate the range of
destinations to which the advertisement applies.
The ability to specify a range of networks allows OSPF to send one summary
advertisement that represents multiple destinations. For example, a summary
advertisement for the destination 128.185.0.0 with a mask of 0xffff0000 describes
a single route to destinations 128.185.0.0 through 128.185.255.255.
- Configuring IP, ARP, RIP 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 117356-E Rev 00 10
- Before You Begin 17
- Text Conventions 18
- Acronyms 19
- Related Publications 21
- How to Get Help 22
- Chapter 1 23
- IP Addresses 24
- Subnet Addressing 26
- Supernet Addressing 29
- Autonomous Systems 30
- Figure 1-4. ARP Example 32
- OSPF Neighbors 35
- Neighbor Adjacencies 35
- Designated Routers 36
- OSPF Areas 37
- OSPF Router Types 39
- AS External Routes 39
- OSPF Implementation Notes 40
- Router Discovery Protocol 41
- Route Preferences 41
- Route Weights 42
- Figure 1-6. IP Routing Table 44
- IP Traffic Filters 47
- Chapter 2 49
- Starting IP Services 49
- Starting RIP 51
- Starting OSPF 52
- Starting Router Discovery 52
- Adding RIP to an IP Interface 55
- RIP advertises subnets 61
- Chapter 3 63
- Caution: 80
- Customizing an IP Interface 82
- Configuring an SMDS Address 98
- Using the BCC 101
- Using Site Manager 102
- Deleting IP from an Interface 105
- Defining a Static Route 109
- (continued) 111
- (continued) 112
- Choosing a Broadcast Type 115
- Chapter 4 119
- <state> 120
- Figure 4-1. Proxy ARP Example 125
- Chapter 5 131
- Customizing RIP Services 131
- Defining a RIP Accept Policy 154
- Chapter 6 171
- Customizing OSPF Services 171
- Figure 6-1. OSPF ASE Routes 179
- Specifying the Metric Cost 203
- Appendix A 241
- Site Manager Parameters 241
- IP Parameters 242
- IP Interface Parameters 244
- IP Global Parameters 259
- Static Route Parameters 266
- Adjacent Host Parameters 270
- Router Discovery Parameters 273
- OSPF Parameters 275
- OSPF Interface Parameters 280
- OSPF Area Parameters 289
- Area Range Parameters 293
- OSPF NSSA Range Parameters 296
- RIP Parameters 302
- Appendix B 309
- Routing Policy Parameters 309
- RIP Accept Policy Parameters 313
- OSPF Accept Policy Parameters 314
- Appendix C 331
- RIP Export Filters 335
- OSPF Import Filters 338
- OSPF Export Filters 339
- Appendix D 343
- Route Weight Worksheet 343
- Appendix E 347
- IP/OSPF Configuration Example 347
- Area 0.0.0.1STUB area 0.0.0.2 348
- Backbone 0.0.0.0 348
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