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Brocade Virtual ADX Switch and Router Guide 101
53-1003246-01
Chapter
6
Configuring OSPF
This chapter describes how to configure OSPF on Brocade Layer 3 Switches using the CLI and Web
Management Interface.
To display OSPF configuration information and statistics, refer to “Displaying OSPF information” on
page 137.
Overview of OSPF
OSPF is a link-state routing protocol. The protocol uses link-state advertisements (LSA) to update
neighboring routers regarding its interfaces and information on those interfaces. The router floods
these LSAs to all neighboring routers to update them regarding the interfaces. Each router
maintains an identical database that describes its area topology to help a router determine the
shortest path between it and any neighboring router.
The Virtual ADX supports the following types of LSAs, which are described in RFC 1583:
• Router link
• Network link
• Summary link
• Autonomous system (AS) summary link
• AS external link
• Not-So-Stubby Area (NSSA) external link
OSPF is built upon a hierarchy of network components. The highest level of the hierarchy is the
Autonomous System (AS). An autonomous system is defined as a number of networks, all of which
share the same routing and administration characteristics.
An AS can be divided into multiple areas as shown in Figure 19 on page 102. Each area represents
a collection of contiguous networks and hosts. Areas limit the area to which link-state
advertisements are broadcast, thereby limiting the amount of flooding that occurs within the
network. An area is represented in OSPF by either an IP address or a number.
You can further limit the broadcast area of flooding by defining an area range. The area range
allows you to assign an aggregate value to a range of IP addresses. This aggregate value becomes
the address that is advertised instead all of the individual addresses it represents being
advertised. You can assign up to 32 ranges in an OSPF area.
An OSPF router can be a member of multiple areas. Routers with membership in multiple areas are
known as Area Border Routers (ABRs). Each ABR maintains a separate topological database for
each area the router is in. Each topological database contains all of the LSA databases for each
router within a given area. The routers within the same area have identical topological databases.
The ABR is responsible for forwarding routing information or changes between its border areas.
- Brocade Virtual ADX 1
- Document History 2
- Contents 3
- Chapter 4 Configuring IP 4
- Chapter 5 Rate Limiting 5
- Chapter 6 Configuring OSPF 5
- Chapter 7 Configuring OSPFv3 6
- Chapter 9 Configuring BGP4+ 9
- 53-1003246-01 10
- Document conventions 11
- Command syntax conventions 12
- Notes, cautions, and warnings 12
- Brocade resources 13
- Document feedback 14
- Configuring Basic Features 15
- • The time stamp 19
- • The user name 19
- Configuring CLI banners 22
- Configuring terminal display 24
- Assigning a port name 25
- Changing the MAC age time 26
- Enabling port-based VLANs 27
- Displaying mac addresses 29
- TABLE 2 System parameters 30
- System parameter Description 31
- Configuring Basic Layer 3 33
- Disabling Layer 2 switching 34
- Additional features 35
- Overview 37
- Default VLAN 39
- 802.1q tagging 40
- Virtual routing interfaces 42
- • Dynamic ports 43
- Dynamic ports 44
- Static ports 45
- Excluded ports 45
- Broadcast leaks 45
- Routing between VLANs 46
- Dynamic port assignment 47
- Configuring port-based VLANs 48
- Modifying a port-based VLAN 50
- Configuring IP subnet VLANs 51
- Displaying VLAN information 58
- Configuring IP 61
- IP route table 62
- IP forwarding cache 63
- IP access policies 64
- IP global parameters 65
- • Redirect messages 66
- IP interface parameters 67
- Configuring IP parameters 68
- VADX-DUT3(config)#int eth 1 69
- Deleting an IP address 70
- Defining a DNS entry 73
- Defining a domain name 74
- Defining DNS servers 74
- Changing the router ID 75
- Configuring ARP parameters 77
- Changing the TTL threshold 79
- Disabling ICMP messages 81
- Configuring static routes 82
- Configuring a static IP route 84
- Configuring a “Null” route 85
- Configuring IP load sharing 91
- How IP load sharing works 93
- Virtual ADX(config)# int e 1 98
- Displaying IP information 99
- This field... Displays 100
- Displaying ARP entries 103
- Clearing IP routes 108
- Rate Limiting 111
- VLAN rate limiting 113
- VLAN rate limiting statistics 114
- Configuring OSPF 115
- Enable OSPF on the router 122
- Assign OSPF areas 123
- Assign a totally stubby area 124
- Modify interface defaults 127
- OSPF interface parameters 128
- Assign virtual links 131
- Example 132
- Define redistribution filters 136
- Enable route redistribution 141
- • SI->R3 143
- • SI->R4 143
- • SI->R5 143
- • SI->R6 143
- Modify SPF Timers 146
- • Intra-area routes 147
- • Inter-area routes 147
- • External routes 147
- Modify OSPF traps generated 148
- Modify exit overflow interval 150
- Displaying OSPF information 151
- Syntax: show ip ospf config 152
- • normal 154
- • 1 = point-to-point link 155
- This field Displays 157
- Displaying the data in an LSA 161
- Displaying OSPF trap status 162
- Syntax: show ip ospf trap 163
- Configuring OSPFv3 165
- Enabling OSPFv3 167
- Assigning an NSSA area 168
- • IPv6 static routes 174
- • match metric number 175
- Filtering OSPFv3 routes 177
- • 1 – Type 1 external route 179
- • 2 – Type 2 external route 179
- IPsec for OSPFv3 184
- Configuring IPsec for OSPFv3 185
- IPsec examples 188
- Showing IPsec policy 189
- Showing IPsec statistics 190
- Area configuration of IPsec 192
- Displaying OSPFv3 information 195
- This Field... Displays 196
- • Enabled 201
- • Disabled 201
- Field Description 205
- TABLE 34 OSPFv3 SPF Table 212
- Configuring BGP4 (IPv4) 213
- • IGP is lowest 214
- BGP4 message types 215
- OPEN message 216
- UPDATE message 216
- KEEPALIVE message 217
- NOTIFICATION message 217
- REFRESH message 217
- Implementation of BGP4 218
- BGP4 null0 routing 219
- Configuring BGP4 220
- BGP4 configuration levels 221
- Enabling and disabling BGP4 223
- Disabling BGP4 224
- Multi-Exit Discriminators 226
- Redistributing IBGP routes 227
- Enabling AS4 numbers 228
- AS4 notation 231
- • Logs an error 232
- BGP4 max-as error messages 233
- Originating the default route 235
- Setting the local AS number 239
- Configuring BGP4 neighbors 242
- Encryption example 249
- Enabling next-hop recursion 252
- Redistributing static routes 256
- Changing the device ID 258
- Adding a loopback interface 259
- BGP4 load sharing 259
- Filtering 260
- Defining an AS-path ACL 261
- Using regular expressions 261
- Special characters 262
- Filtering communities 263
- Defining a community ACL 264
- Defining route maps 266
- Matching based on AS-path ACL 269
- Matching based on interface 271
- • ethernet port 272
- • loopback loopback-number 272
- • ve ve-ID 272
- Dynamic route filter update 275
- Filter update delay and BGP 276
- BGP4 policy processing order 277
- Using soft reconfiguration 281
- Clearing traffic counters 287
- Removing route flap dampening 288
- Clearing diagnostic buffers 288
- Configuration steps 289
- Configuration examples 289
- Show commands 290
- Device 1 and 2 291
- Device 6 291
- Displaying BGP4 information 292
- Displaying route details 313
- BGP4 route information 314
- Displaying AS4 details 319
- Attribute entries 320
- AS-path prepend information 321
- Running configuration 321
- Syntax: as-format asdot 322
- Configuring BGP4+ 323
- Adding BGP4+ neighbor 326
- Configuring a route map 326
- Importing routes into BGP4+ 328
- Clearing BGP4+ information 330
- Displaying BGP4+ information 334
- Displaying BGP4+ summary 371
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