Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 Manuel d'utilisateur Page 330
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312 Brocade ICX 6650 Layer 3 Routing Configuration Guide
53-1002603-01
Optional BGP4 configuration tasks
The route to the next-hop gateway is a BGP route, not an IGP route, and thus cannot be used to
reach 192.168.0.0/24. In this case, the Layer 3 switch tries to use the default route, if present, to
reach the subnet that contains the BGP route next-hop gateway.
Example when recursive route lookups are enabled
When recursive next-hop lookups are enabled, the Layer 3 switch recursively looks up the next-hop
gateways along the route until the Layer 3 switch finds an IGP route to the BGP route destination.
Here is an example.
The first lookup results in an IBGP route, to network 192.168.0.0/24.
Since the route to 192.168.0.1/24 is not an IGP route, the Layer 3 switch cannot reach the next
hop through IP, and thus cannot use the BGP route. In this case, since recursive next-hop lookups
are enabled, the Layer 3 switch next performs a lookup for 192.168.0.1 next-hop gateway,
10.0.0.1.
Brocade#show ip route 10.0.0.1
Total number of IP routes: 37
Network Address NetMask Gateway Port Cost Type
10.0.0.0 255.255.255.0 10.0.0.1 1/1/1 1 B
Brocade#show ip route 240.0.0.0/24
Total number of IP routes: 37
Network Address NetMask Gateway Port Cost Type
0.0.0.0 0.0.0.0 10.0.0.202 1/1/1 1 S
Brocade#show ip /jointfilesconvert/81914/bgp route
Total number of BGP Routes: 5
Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED
H:HISTORY I:IBGP L:LOCAL M:MULTIPATH S:SUPPRESSED
Prefix Next Hop Metric LocPrf Weight Status
1 0.0.0.0/0 10.1.0.2 0 100 0 BI
AS_PATH: 65001 4355 701 80
2 192.168.0.0/24 10.0.0.1 1 100 0 BI
AS_PATH: 65001 4355 1
3 192.168.10.0/24 10.1.0.2 0 100 0 BI
AS_PATH: 65001 4355 701 1 189
4 192.168.30.0/24 10.0.0.1 1 100 0 BI
AS_PATH: 65001 4355 3356 7170 1455
5 192.160.80.0/24 10.157.24.1 1 100 0 I
AS_PATH: 65001 4355 701
Brocade#show ip route 192.168.0.1
Total number of IP routes: 38
Network Address NetMask Gateway Port Cost Type
192.168.0.0 255.255.255.0 10.0.0.1 1/1/1 1 B
AS_PATH: 65001 4355 1
- Brocade ICX 6650 1
- Document History 2
- Contents 3
- Chapter 3 RIP (IPv4) 5
- Chapter 4 RIP (IPv6) 5
- Chapter 7 BGP (IPv4) 8
- Chapter 8 IPv6 10
- Chapter 9 VRRP and VRRP-E 10
- About This Document 13
- Slot 2 Slot 3 14
- Document conventions 15
- Notice to the reader 16
- Related publications 16
- Additional information 17
- Getting technical help 17
- Document feedback 18
- IP Configuration 19
- Basic IP configuration 20
- IP configuration overview 20
- IP interfaces 21
- Layer 2 Switches 22
- IP route table 25
- IP forwarding cache 26
- IP route exchange protocols 27
- IP multicast protocols 28
- ACLs and IP access policies 28
- • Ethernet II 33
- Configuring IP addresses 37
- Deleting an IP address 41
- Configuration example 42
- Configuring DNS resolver 43
- Defining a domain name 44
- Defining DNS server addresses 44
- Defining a domain list 45
- Configuring packet parameters 46
- 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 56
- Enabling local proxy ARP 57
- Creating static ARP entries 57
- Brocade(config)# write memory 58
- Brocade(config)# end 58
- Brocade# reload 58
- Disabling ICMP messages 61
- Static routes configuration 63
- Static IP route parameters 64
- Configuring a static IP route 65
- Configuring a “Null” route 67
- Configuring IP load sharing 73
- How IP load sharing works 75
- IRDP parameters 77
- Disabling RARP 79
- Creating static RARP entries 80
- DHCP Server 85
- DHCP option 82 support 86
- DHCP Server options 86
- Default DHCP Server settings 89
- DHCP Server CLI commands 89
- Command Description 91
- Removing DHCP leases 92
- Enabling DHCP Server 92
- Creating an address pool 93
- Configuring the boot image 93
- Configuring the TFTP server 95
- 53-1002603-01 100
- DHCP Log messages 105
- Defining a DNS entry 107
- Changing the TTL threshold 108
- DHCP Assist configuration 109
- How DHCP Assist works 110
- Configuring DHCP Assist 112
- IPv4 GRE tunnel overview 113
- FIGURE 15 GRE header format 114
- - ACL logging 116
- - MAC address filters 116
- - IPv6 filters 116
- Required tasks 118
- Optional tasks 118
- Creating a tunnel interface 119
- Device A 125
- Field Definition 127
- Field Description 128
- Clearing GRE statistics 130
- Global settings 132
- Static routes 132
- Policies 133
- Displaying ARP entries 136
- Brocade# show ip static-arp 138
- Displaying the IP route table 140
- Clearing IP routes 142
- IP statistics 144
- ICMP statistics 144
- UDP statistics 144
- TCP statistics 145
- RIP statistics 145
- IP configuration 146
- Most recent TFTP access 146
- Syntax: show ip traffic 148
- Adding a static IP route 151
- Adding a static ARP entry 152
- Configuring RIP 154
- 255.255.0.0 155
- 255.255.0.0 match-metric 5 155
- Enabling redistribution 156
- Other Layer 3 protocols 157
- Layer 2 switching 158
- RIP (IPv4) 159
- RIP parameters and defaults 160
- RIP interface parameters 161
- RIP parameter configuration 162
- Configuring a RIP offset list 163
- Configuring redistribution 164
- Disabling poison reverse 168
- VRRP-E backup interface 169
- Configuring RIP route filters 169
- Displaying RIP filters 171
- RIP (IPv6) 175
- RIPng configuration 176
- RIPng timers 177
- • IPv6 static routes 179
- • OSPF V3 179
- Brocade# clear ipv6 rip route 181
- Syntax: show ipv6 rip 182
- RIPng configuration fields 182
- OSPF version 2 (IPv4) 185
- OSPF overview 186
- OSPF point-to-point links 187
- OSPF graceful restart 194
- Configuring OSPF 195
- Enabling OSPF on the router 196
- Assigning OSPF areas 197
- Example 198
- Brocade(config)#router ospf 200
- Modifying interface defaults 202
- OSPF interfaces 205
- Assigning virtual links 207
- Enabling route redistribution 218
- Example using a route map 219
- • Brocade Switch->R3 221
- • Brocade Switch->R4 221
- • Brocade Switch->R5 221
- • Brocade Switch->R6 221
- Modifying SPF timers 224
- Administrative distance 225
- Clearing OSPF information 230
- Brocade#clear ip ospf 231
- Displaying OSPF information 232
- Syntax: show ip ospf config 233
- • normal 235
- Displaying the data in an LSA 242
- Displaying OSPF trap status 243
- • UK – Unknown 244
- • RS – Software restart 244
- OSPF version 3 (IPv6) 245
- OSPF V3 configuration 247
- Assigning OSPF V3 areas 248
- Configuring virtual links 249
- OSPF V3 interfaces 252
- • match metric number 254
- External route summarization 256
- Filtering OSPF V3 routes 257
- Default route origination 260
- Shortest path first timers 261
- IPsec for OSPF V3 265
- Configuring IPsec for an area 270
- Clearing IPsec statistics 272
- • Virtual links 273
- • Virtual neighbors 273
- Syntax: show ipv6 ospf memory 282
- • RIP – RIPng 286
- TABLE 54 OSPF V3 SPF table 290
- • DOWN – The link is down 291
- IPsec examples 292
- Brocade#show ipsec policy 293
- Showing IPsec statistics 294
- Area configuration of IPsec 297
- BGP (IPv4) 299
- BGP4 overview 300
- BGP4 message types 303
- BGP4 graceful restart 305
- BGP4 parameters 306
- BGP4 parameter changes 307
- Enabling BGP4 on the router 309
- Changing the router ID 309
- Setting the local AS number 310
- Adding a loopback interface 310
- Adding BGP4 neighbors 310
- • show configuration 315
- • show ip bgp config 315
- Adding a BGP4 peer group 317
- Configuring a peer group 319
- Brocade(config)#router bgp 322
- BGP4 load sharing 323
- How load sharing works 324
- Customizing BGP4 load sharing 325
- Advertising the default route 328
- Enabling next-hop recursion 328
- AS-Path length 333
- Multi-Exit Discriminators 334
- • Restart timer 342
- • Stale routes timer 342
- • Purge timer 342
- BGP null0 routing 343
- Internet 344
- S1 and S2 347
- Redistributing RIP routes 349
- Redistributing static routes 350
- Filtering 351
- AS-path filtering 352
- Defining an AS-path filter 353
- Defining an AS-path ACL 353
- Character Operation 354
- BGP4 filtering communities 356
- Defining a community ACL 357
- Defining IP prefix lists 358
- Defining route maps 360
- Match examples using ACLs 363
- • Configure the filter 369
- Sending and receiving ORFs 370
- Generating traps for BGP 378
- Displaying BGP4 information 379
- BGP4 summary information 380
- Displaying route details 402
- BGP4 route information 403
- Using soft reconfiguration 409
- Dynamically refreshing routes 412
- Clearing traffic counters 415
- Removing route flap dampening 416
- Clearing diagnostic buffers 417
- Feature Brocade ICX 6650 419
- IPv6 over IPv4 tunnels 421
- ECMP load sharing for IPv6 426
- VRRP and VRRP-E 429
- VRRP and VRRP-E overview 430
- Virtual router ID 432
- Virtual router MAC address 432
- Virtual router IP address 432
- Master negotiation 433
- Hello messages 433
- Authentication 434
- VRRP-E overview 435
- Comparison of VRRP and VRRP-E 438
- Management protocol 439
- Master and Backup routers 439
- VRRP and VRRP-E parameters 440
- Configuration rules for VRRP 443
- Configuring IPv4 VRRP-E 448
- Configuring IPv6 VRRP-E 449
- VRRP router type 453
- Hello interval configuration 455
- Dead interval configuration 456
- Track port configuration 457
- Track priority configuration 457
- Backup preempt configuration 458
- Changing the timer scale 458
- VRRP-E slow start timer 459
- • show run 462
- • show ip vrrp-e brief 462
- • show ip vrrp-e vrid vrid 462
- • VRRP and VRRP-E statistics 464
- • CPU utilization statistics 464
- Interface parameters 468
- VRID parameters 468
- Displaying statistics 472
- Interface statistics 473
- VRID statistics 473
- IPv6 VRRP-E v3 476
- Configuration examples 478
- VRRP-E example 479
- Configuring Switch 2 480
- Syntax: ip-address ip-addr 481
- Syntax: activate 481
- Numerics 483
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