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Basic BGP Configuration Using the CLI If the routing table does not include a route that has been specified in BGP, a null route must be configured. For example, a routing table only includes routes to the 24-bit networks, but not to the 20-bit network that contains them all. A route to network 10.1.0.0 /20 must be manually added so that the BGP interface can advertise it. The route is added from the Global Configuration mode with the null 0 keyword indicating the next-hop address: (config)#ip route 10.1.0.0 255.255.240.0 null 0 If a more specific route (for example, from connected interfaces, static routes, routing protocols, etc.) other than the one to null 0 does not exist in the routing table, then all traffic for the specified subnet will be dropped. Null 0 routes should only be used when a more specific route is available to which to direct traffic. Step 3: Configure at Least One BGP Neighbor BGP is different from many routing protocols because it does not allow a router to automatically search for peers from which to obtain routes. A separate BGP neighbor must be configured for each router with which the local router will communicate. Optional policies for each neighbor can be configured to dictate which routes the BGP interface sends to and accepts from the neighbor (refer to Additional BGP Configuration on page 12). Set the BGP Neighbor ID (IPv4 address) BGP identifies a peer router by its IPv4 address. A neighbor’s ID is set when a policy is created for it. Enter the BGP Neighbor Configuration mode from the BGP Configuration mode as follows: (config-bgp)#neighbor Specifies the IPv4 address for the neighbor. IPv4 addresses should be expressed in dotted decimal notation (for example, 10.10.10.1) or as a prefix length (for example, /24)). The IPv4 address entered in this command must match the address for the interface that the remote router is using as its update source. The local router must be able to reach the IPv4 address configured as the neighbor ID. View the routing table and verify that it includes a route to this address. Specify the Remote AS Number The AS to which this neighbor belongs must also be specified. The remote-as command is issued from the BGP Neighbor Configuration mode: (config-bgp-neighbor)#remote-as Specifies the AS number. Range is 1 to 4294967295. 10 Copyright © 2012 ADTRAN, Inc. 61200860L1-29.4E
Basic BGP Configuration Using the CLI When configuring eBGP, the remote AS number must be different from that of the local router (which is defined using the router bgp command). The following example configures a remote AS number of 200 for neighbor 172.16.1.2: (config)#router bgp 1 (config-bgp)#router bgp-neighbor 172.16.1.2 (config-bgp-neighbor)#remote-as 200 Assuming the neighbor is properly configured, the AOS device should now be able to connect to the neighbor and exchange routes with it. Step 4: Save the Configuration The configuration can be saved directly from the BGP Configuration mode or BGP Neighbor Configuration mode: (config-bgp-neighbor)#do write When the command to save the configuration is issued from the Enable mode, the command is: write. 61200860L1-29.4E Copyright © 2012 ADTRAN, Inc. 11
Page 1 and 2: 61200860L1-29.4E March 2012 Configu
Page 3 and 4: BGP Overview By defining autonomous
Page 5 and 6: BGP Overview Multi-Exit Discriminat
Page 7 and 8: BGP Overview For example, in Figure
Page 9: Basic BGP Configuration Using the C
Page 13 and 14: Additional BGP Configuration BGP Co
Page 15 and 16: Additional BGP Configuration Speci
Page 17 and 18: Additional BGP Configuration Routes
Page 19 and 20: Additional BGP Configuration Log Ne
Page 21 and 22: Additional BGP Configuration An ent
Page 23 and 24: Additional BGP Configuration (confi
Page 25 and 26: Additional BGP Configuration If an
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Page 29 and 30: Additional BGP Configuration The al
Page 31 and 32: Additional BGP Configuration Refer
Page 33 and 34: Additional BGP Configuration The pe
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Page 51 and 52: Example Configurations router bgp 5
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Page 59 and 60: Configuration Command Summary Table
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Configuration Command Summary Refer
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Configuration Command Summary Step
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Configuration Command Summary Table
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Troubleshooting Table 11. Viewing B
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Troubleshooting Use the show ip bgp
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Troubleshooting Show IP BGP Neighbo
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Troubleshooting * 10.22.132.8/29 10
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Troubleshooting Typically, soft res
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Troubleshooting Router# show ip bgp
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Troubleshooting Router#show ip bgp
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Troubleshooting Criteria for select
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Appendix Appendix AS Regular Expres
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