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BGP4 null0 routing
BGP4 considers the null0 route in the routing table (for example, static route) as a valid route, and can
use the null0 route to resolve the next hop. If the next hop for BGP4 resolves into a null0 route, the
BGP4 route is also installed as a null0 route in the routing table.
The null0 routing feature allows network administrators to block certain network prefixes using null0
routes and route-maps, directing a remote device to drop all traffic for a network prefix by redistributing
a null0 route into BGP4.
This example shows a topology for a null0 routing application example.
FIGURE 34 SAMPLE null0 routing application
Configuring BGP4 null0 routing
The following example configures a null0 routing application to stop denial of service attacks from
remote hosts on the Internet.
1. Select a device, for example, device 6, to distribute null0 routes throughout the BGP4 network.
2. To configure a route-map perform the following step.
• Configure a route-map to match a particular tag (50) and set the next-hop address to an unused
network address (10.199.1.1).
3. Set the local-preference to a value higher than any possible internal or external local-preference (50).
4. Complete the route map by setting origin to IGP.
5. On device 6, redistribute the static routes into BGP4, using route-map route-map-name (redistribute
static route-map block user).
BGP4 null0 routing
FastIron Ethernet Switch Layer 3 Routing Configuration Guide 431
53-1003087-04
- FastIron Ethernet Switch 1
- Layer 3 Routing 1
- Contents 3
- 53-1003087-04 10
- Document conventions 15
- Notes, cautions, and warnings 16
- Brocade resources 17
- Document feedback 18
- About This Document 19
- Basic IP configuration 22
- IP configuration overview 23
- Layer 3 switches 24
- Layer 2 switches 24
- ARP cache 26
- Static ARP table 26
- IP route table 27
- IP forwarding cache 27
- IP route exchange protocols 28
- IP multicast protocols 29
- ACLs and IP access policies 29
- Configuring IP addresses 38
- Deleting an IP address 41
- Configuration example 42
- Configuring DNS resolver 43
- Defining DNS server addresses 44
- Defining a domain list 44
- Configuring packet parameters 45
- Changing the MTU 46
- Changing the router ID 48
- Telnet packets 50
- TACACS/TACACS+ packets 51
- RADIUS packets 51
- TFTP packets 51
- Syslog packets 52
- SNTP packets 52
- SSH packets 52
- ARP parameter configuration 53
- Rate limiting ARP packets 54
- Changing the ARP aging period 55
- Enabling proxy ARP 55
- Creating static ARP entries 56
- ARP Packet Validation 58
- Ingress ARP packet priority 59
- Disabling ICMP messages 62
- Static routes configuration 64
- Static IP route parameters 65
- Configuring a static IP route 66
- Naming a static IP route 68
- Configuring IP load sharing 74
- Path cost 75
- How IP load sharing works 76
- IRDP parameters 77
- Enabling IRDP globally 78
- Disabling RARP 80
- Creating static RARP entries 80
- DHCP Server 85
- DHCP Option 82 support 86
- DHCP Server options 86
- Default DHCP server settings 88
- DHCP server CLI commands 88
- Removing DHCP leases 90
- Enabling DHCP Server 90
- Creating an address pool 91
- Configuring the TFTP server 94
- DHCP Log messages 104
- Defining a DNS entry 106
- Changing the TTL threshold 107
- DHCP Assist configuration 108
- How DHCP Assist works 109
- IP Configuration 110
- Configuring DHCP Assist 111
- IPv4 GRE tunnel overview 112
- Creating a tunnel interface 119
- Clearing GRE statistics 131
- Displaying ARP entries 136
- Displaying the IP route table 140
- Clearing IP routes 143
- Syntax: show ip traffic 148
- Disabling IP checksum check 151
- Layer 3 Routing Protocols 153
- Adding a static IP route 154
- Static route recursive lookup 156
- Adding a static ARP entry 157
- Layer 3 configuration notes 158
- Switches 163
- IPv6 addressing overview 165
- IPv6 address types 166
- IPv6 CLI command support 168
- Enabling IPv6 routing 172
- FE48:4672:/64 173
- Configuring SNMP V3 over IPv6 177
- Secure Shell, SCP, and IPv6 177
- IPv6 Telnet 177
- IPv6 traceroute 178
- Defining an IPv6 DNS entry 179
- Pinging an IPv6 address 179
- Contact: 180
- Neighbor redirect messages 185
- IPv6 MTU 190
- Clearing the IPv6 cache 194
- Displaying local IPv6 routers 201
- Syntax: show ipv6 traffic 205
- DHCP relay agent for IPv6 209
- RIP feature support 219
- RIP Overview 219
- RIP parameters and defaults 220
- Configuring RIP parameters 222
- Configuring metric parameters 223
- Configuring redistribution 224
- Enabling redistribution 225
- Setting RIP timers 229
- Displaying RIP Information 230
- Metric-offset, Outbound 0 231
- RIPng feature support 233
- RIPng Overview 233
- Configuring RIPng 234
- Configuring RIPng timers 235
- Displaying RIPng information 239
- OSPFv2 feature support 243
- OSPF overview 244
- OSPF point-to-point links 246
- OSPF graceful restart 252
- Configuring OSPF 254
- OSPF parameters 255
- Enable OSPF on the device 256
- Assign OSPF areas 256
- Assign a totally stubby area 257
- Configuring an NSSA 258
- Modify interface defaults 262
- Assign virtual links 266
- Define redistribution filters 271
- Enable route redistribution 273
- OSPF non-stop routing 279
- LSA delayed acknowledging 280
- LSA syncing and packing 280
- Standby module operations 281
- Enabling and disabling NSR 282
- Disabling configuration 282
- OSPF distribute list 283
- Examples 284
- Modify SPF timers 286
- Modify OSPF traps generated 288
- Modify exit overflow interval 289
- Displaying OSPF information 295
- Displaying OSPF trap status 311
- Clearing OSPF neighbors 314
- Clearing OSPF information 316
- OSPFv3 feature support 317
- OSPFv3 overview 318
- Configuring OSPFv3 319
- Assigning OSPFv3 areas 320
- Specifying a network type 325
- Configuring virtual links 326
- Filtering OSPFv3 routes 332
- IPsec for OSPFv3 340
- Configuring IPsec for OSPFv3 340
- General considerations 341
- Configuring IPsec for an area 344
- Clearing IPsec statistics 346
- Displaying OSPFv3 information 348
- IPsec examples 372
- Showing IPsec policy 373
- Showing IPsec statistics 374
- Changing a key 378
- OSPFv3 clear commands 379
- Clearing OSPFv3 data in a VRF 380
- Clearing OSPFv3 neighbors 380
- Clearing OSPFv3 counters 381
- Configuring BGP4 (IPv4) 383
- BGP4 overview 385
- BGP4 message types 388
- Grouping of RIB-out peers 389
- Implementation of BGP4 390
- BGP4 restart 390
- BGP4 neighbor local AS 392
- Disabling BGP4 394
- BGP4 parameters 395
- Memory considerations 397
- Enabling BGP4 on the device 398
- Changing the device ID 398
- Setting the local AS number 399
- Adding a loopback interface 400
- Adding BGP4 neighbors 400
- Encryption example 406
- Adding a BGP4 peer group 408
- Configuring a peer group 409
- Enabling next-hop recursion 417
- Support for RFC 4456 425
- Configuring confederations 426
- Commands for device A 428
- Commands for device B 428
- Commands for device C 428
- Commands for device D 428
- Configuring BGP4 restart 429
- BGP4 null0 routing 431
- Configuration examples 432
- Redistributing RIP routes 435
- Redistributing static routes 436
- Redistributing IBGP routes 436
- Filtering 437
- Using regular expressions 438
- BGP4 filtering communities 440
- Defining a community ACL 441
- Defining route maps 443
- Match examples using ACLs 445
- Matching based on interface 448
- Sending and receiving ORFs 452
- Enabling AS4 numbers 454
- Global AS4 configuration 455
- AS4 notation 457
- BGP4 AS4 attribute errors 458
- Generating traps for BGP4 464
- Configuring BGP4 464
- BGP route reflector 466
- BGP4 max-as error messages 471
- Originating the default route 471
- Dynamic route filter update 475
- Filter update delay and BGP 476
- Displaying BGP4 information 477
- Displaying advertised routes 491
- Displaying the best routes 492
- Displaying route details 499
- Displaying AS4 details 506
- Attribute entries 513
- Running configuration 514
- Using soft reconfiguration 517
- Dynamically refreshing routes 520
- Clearing traffic counters 523
- Clearing diagnostic buffers 523
- Configuring BGP4+ 525
- Enabling BGP4+ 527
- Adding BGP4+ neighbor 528
- Configuring a route map 529
- Creating a BGP4+ peer group 530
- Importing routes into BGP4+ 532
- Using route maps 534
- Clearing BGP4+ information 537
- Displaying BGP4+ information 541
- Total number of BGP Routes: 4 547
- Displaying BGP4+ summary 580
- VRRP and VRRP-E 585
- Overview 586
- VRRP and VRRP-E overview 586
- Virtual router ID 588
- Virtual router MAC address 588
- Virtual router IP address 589
- Master negotiation 589
- Hello messages 590
- VRRP-E overview 591
- ARP behavior with VRRP-E 593
- Comparison of VRRP and VRRP-E 594
- VRRP and VRRP-E parameters 595
- Configuration rules for VRRP 599
- Configuring IPv4 VRRP-E 604
- Configuring IPv6 VRRP-E 604
- Configuring Switch 1 606
- VRRP syntax 606
- VRRP-E syntax 606
- VRRP router type 607
- Hello interval configuration 609
- Dead interval configuration 610
- Track port configuration 611
- Track priority configuration 611
- Backup preempt configuration 612
- Changing the timer scale 612
- VRRP-E slow start timer 613
- Displaying statistics 627
- VRRP example 632
- VRRP-E example 633
- Configuring Multi-VRF 635
- Multi-VRF Overview 637
- Configuring VRF instances 642
- Removing a Multi-VRF instance 644
- Configuring Management VRFs 645
- SNMP server 646
- SNMP trap generator 646
- SSH server 646
- Telnet client 646
- RADIUS client 647
- TACACS+ client 647
- Configuration notes 649
- Proxy ARP and Local Proxy ARP 653
- ARP rate-limiting 653
- Assigning loopback interfaces 655
- Multi-VRF Show commands 655
- Step 2: Configuring VRFs 660
- Layer 3 Routing Commands 663
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