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53-1003246-01
Enabling next-hop recursion
8
Example when recursive route lookups are disabled
The output here shows the results of an unsuccessful next-hop lookup for a BGP4 route. In this
case, next-hop recursive lookups are disabled. This example is for the BGP4 route to network
10.0.0.0/24.
In this example, the device cannot reach 10.0.0.0/24, because the next-hop IP address for the
route is an IBGP route instead of an IGP route, and is considered unreachable by the device. The IP
route table entry for the next-hop gateway for the BGP4 route’s next-hop gateway (10.0.0.1/24) is
shown here.
.
Since the route to the next-hop gateway is a BGP4 route, and not an IGP route, it cannot be used to
reach 10.0.0.0/24. In this case, the device tries to use the default route, if present, to reach the
subnet that contains the BGP4 route next-hop gateway.
Example when recursive route lookups are enabled
When recursive next-hop lookups are enabled, the device continues to look up the next-hop
gateways along the route until the device finds an IGP route to the BGP4 route destination.
Virtual ADX# show ip /jointfilesconvert/1441199/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 10.0.0.0/24 10.0.0.1 1 100 0 BI
AS_PATH: 65001 4355 1
3 10.0.0.0/24 10.1.0.2 0 100 0 BI
AS_PATH: 65001 4355 701 1 189
4 10.0.0.0/24 10.0.0.1 1 100 0 I
AS_PATH: 65001 4355 3356 7170 1455
5 10.0.0.0/24 10.157.24.1 1 100 0 I
AS_PATH: 65001 4355 701
Virtual ADX# show ip route 10.0.0.1 hw | longer
Total number of IP routes: 37
Start index: 1 B:BGP Be:EBGP Bi:IBGP D:Connected R:RIP S:Static
O:OSPF IA:Inter area IR:Intra area E1:External type 1 E2:External type 2
(N): Don't advertise *:Candi-default
Destination NetMask Gateway Port Cost Type
--------------------------------------------------------------------------
1 10.0.0.0 255.255.255.0 10.0.0.1 1/1 1B
Virtual ADX# show ip route 10.0.0.0/24 hw | longer
Total number of IP routes: 37
Start index: 1 B:BGP Be:EBGP Bi:IBGP D:Connected I:ISIS S:Static
O:OSPF IA:Inter area IR:Intra area E1:External type 1 E2:External type 2
(N): Don't advertise *:Candi-default
Destination NetMask Gateway Port Cost Type
--------------------------------------------------------------------------
1 0.0.0.0 255.255.255.0 10.0.0.201 1/1 1 S
- 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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