KB.15.15

Specifying the number of times the autonomous system can appear in an AS path

Syntax:

[no]neighbor ipv4-addr allowas-in num-loops

Specifies the number of times this autonomous system can appear in an AS path.

When not configured, or when using theno version of the command, the value of

as-loops is set to its default value of 1.

Replacing occurrences of peer's AS with one from an export

Syntax:

[no] neighbor ipv4-addr as-override

Causes all occurrences of our peer’s AS to be replaced with one from an export.

Allowing BGP to keep routes without AS number

Syntax:

[no] neighbor ipv4-addr ignore-leading-as

Some routers are capable of propagating routes without appending their own

autonomous system number to the AS Path. By default, BGP will drop such routes.

Turning this parameter “on” allows BGP to keep these routes. This option should

be used only if there is no doubt that these peers are not normal routers.

Identifying the AS that BGP is representing to a peer

Syntax:

[no] neighbor ipv4-addr local-as as-#

Identifies the autonomous system (AS) that BGP is representing to a peer. The default

AS number for this command is the current AS (configured with the router bgp

command in Global Configuration mode.) This command is valid only for external

peers.

Specifying maximum number of routes for installation into the RIB

Syntax:

[no] neighbor ipv4-addr maximum-prefix max-routes

Specifies the maximum number of routes that BGP will accept for installation into

the RIB. The value defaults to “unlimited” if not specified, or if using the no version

of the command.

Specifying the amount of time route is present in database before exported to BGP

Syntax:

[no] neighbor ipv4-addr out-delay sec

The specified integer represents the amount of time a route must be present in the

routing database before it is exported into BGP. Defaults to 0 if not specified or if

unconfigured by using the no version of command.

Neighbor configuration and neighbor policy configuration 299