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53-1003246-01
Overview of OSPF
6
Designated router election in multi-access networks
In a network with no designated router and no backup designated router, the neighboring router
with the highest priority is elected as the DR, and the router with the next largest priority is elected
as the BDR, as shown in Figure 20
FIGURE 20 Designated and backup router election
If the DR goes off-line, the BDR automatically becomes the DR. The router with the next highest
priority becomes the new BDR. This process is shown in Figure 21.
NOTE
Priority is a configurable option at the interface level. You can use this parameter to help bias one
router as the DR.
FIGURE 21 Backup designated router becomes designated router
If two neighbors share the same priority, the router with the highest router ID is designated as the
DR. The router with the next highest router ID is designated as the BDR.
NOTE
By default, the Brocade router ID is the IP address configured on the lowest numbered loopback
interface. If the Layer 3 Switch does not have a loopback interface, the default router ID is the lowest
numbered IP address configured on the device. For more information or to change the router ID,
refer to “Changing the router ID” on page 61.
- 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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