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Customizing OSPF Services
308627-14.00 Rev 00
6-11
Choosing a Tag Generation Method for an ASE Advertisement
An OSPF AS external route advertisement includes an external route tag field.
This field allows boundary routers in an AS to exchange information about
external routes. (The specific nature of this information is outside the scope of
OSPF.)
By default, Nortel Networks boundary routers that generate ASE advertisements
set the external route tag field to 0. For a boundary router running OSPF and BGP,
you can configure OSPF to set the external route tag field with a value in
accordance with RFC 1403, OSPF/BGP Interaction.
In Figure 6-2
, for example, boundary router R14 running OSPF and BGP learns
external routes via BGP:
1. Router R14 generates an ASE advertisement describing the route. OSPF fills
in the external route tag with BGP-specific information according to RFC
1403.
2. Router R14 injects the ASE into the AS, and OSPF routers flood the ASE
throughout the AS.
3. Router R1, which runs OSPF and BGP, receives the ASE. R1 generates a BGP
update, using the contents of the external route tag to set the Origin and AS
Path attributes in the update.
Note:
This parameter applies to boundary routers only.
- Configuring IP, ARP, RARP 1
- RIP, and OSPF Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 308627-14.00 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 36
- Neighbor Adjacencies 36
- Designated Routers 37
- OSPF Areas 38
- OSPF Router Types 40
- AS External Routes 40
- OSPF Implementation Notes 41
- Router Discovery Protocol 42
- Route Preferences 42
- Route Weights 43
- Figure 1-7. IP Routing Table 45
- IP Traffic Filters 48
- Chapter 2 49
- Starting IP Services 49
- Starting RIP 51
- Starting OSPF 52
- Starting Router Discovery 52
- Adding RIP to an IP Interface 55
- Starting RARP 57
- Chapter 3 63
- Caution: 80
- Customizing an IP Interface 82
- IP0012A 97
- Configuring an SMDS Address 100
- (continued) 101
- Using the BCC 103
- Using Site Manager 104
- Deleting IP from an Interface 107
- Defining a Static Route 111
- 3.2.4.5/255.255.0.0: 113
- Choosing a Broadcast Type 118
- Chapter 4 123
- Customizing ARP 124
- Customizing Global ARP 125
- (continued) 129
- Figure 4-1. Proxy ARP Example 130
- Customizing RARP 134
- Deleting RARP Globally 137
- Chapter 5 139
- Customizing RIP Services 139
- Setting the RIP Diameter 140
- Customizing a RIP Interface 141
- Selecting the RIP Version 142
- Specifying the Update Mode 147
- Sending Triggered Updates 149
- Listening for a Default Route 155
- Defining a RIP Accept Policy 163
- Chapter 6 179
- Customizing OSPF Services 179
- Supplying an OSPF Router ID 182
- Figure 6-1. OSPF ASE Routes 187
- Setting the Holddown Timer 192
- Configuring Message Logging 193
- Configuring an Area ID 198
- Specifying the Interface Type 199
- Estimating the Transit Delay 202
- Setting the Hello Interval 205
- Setting the Dead Interval 207
- Specifying the Metric Cost 209
- Table 6-6. Cost Settings 210
- Specifying the MTU Size 212
- Defining an Area 218
- Configuring Authentication 221
- Configuring a Summary Route 222
- Configuring a Stub Area 224
- 0.0.0.1: 229
- Policies 247
- Appendix A 251
- Site Manager Parameters 251
- IP Parameters 252
- IP Interface Parameters 254
- IP Global Parameters 269
- Static Route Parameters 276
- Adjacent Host Parameters 280
- Router Discovery Parameters 283
- RARP Parameters 285
- OSPF Parameters 287
- OSPF Interface Parameters 292
- OSPF Area Parameters 301
- Area Range Parameters 305
- OSPF NSSA Range Parameters 308
- RIP Parameters 314
- Appendix B 321
- Routing Policy Parameters 321
- RIP Accept Policy Parameters 325
- OSPF Accept Policy Parameters 326
- Appendix C 343
- RIP Export Filters 347
- OSPF Import Filters 350
- OSPF Export Filters 351
- Appendix D 355
- Route Weight Worksheet 355
- Appendix E 359
- IP/OSPF Configuration Example 359
- 10.1.1.0 360
- 255.255.255.0 (RIP Only) 360
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