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Additional BGP Configuration
An entry for the default route must appear in the IGP routing table in order for the previous
command to work in BGP. Refer to Example 7 on page 49 for an illustration using the
network command to enable transmission of the default route to the eBGP neighbor.
Password
Use the password command to enable message digest 5 (MD5) password authentication on Transmission
Control Protocol (TCP) segments exchanged with the BGP peer.
(config-bgp-neighbor)#password
Specifies the password string to be used for authentication. The password is case sensitive
and must not exceed 80 characters.
Authentication must be configured on both peers using the same password.
Every BGP TCP segment sent is authenticated. Configuring authentication causes an existing session to be
torn down and re-established using the currently specified authentication.
Prefix List
Prefix lists are used in BGP configurations to define the routes that a router can advertise to or receive
from a neighbor. Common uses for prefix lists include:
• Preventing a network from becoming a transit for external traffic when multihoming
• Receiving only routes from remote virtual private network (VPN) sites
• Prohibiting the advertisement of a network
• Load balancing outbound traffic
IPv4 address, prefix length, or other attributes must be defined in a prefix list before it can be assigned to a
BGP neighbor.
Refer to Example 3 on page 39 for an example using prefix lists to filter routes.
First, use the ip prefix-list command to specify a prefix to be matched or a range of mask lengths:
(config)#ip prefix-list seq [deny | permit]
(config)#ip prefix-list seq [deny | permit] [ge| le]
Specifies the name of the list. Up to 80 characters are allowed in a name.
Specifies the entry’s unique sequence number that determines the processing order. Lower
numbered entries are processed first. Range is 1 to 4294967294.
permit Permits access to entries matching the specified network IPv4
address and the corresponding network prefix length (for example, 10.10.10.0/24).
61200860L1-29.4E Copyright © 2012 ADTRAN, Inc. 21