Chapter 50
| IP Routing Commands
Border Gateway Protocol (BGPv4)
– 1101 –
in – Filters inbound routing messages.
out – Filters outbound routing messages.
Command Mode
Router Configuration
Default Setting
None
Command Usage
â—† If the specified access list for input or output mode does not exist, all input or
output route updates will be filtered.
â—† The neighbor prefix-list and the neighbor distribute-list commands are
mutually exclusive for a BGP peer. That is, only one of these commands may be
applied in the inbound or outbound direction.
Example
Console(config-router)#neighbor 10.1.1.64 distribute-list RD in
Console(config-router)#
neighbor dont-
capability-negotiate
This command disables capability negotiation when creating connections. Use the
no form to restore the default setting.
Syntax
[no] neighbor {ip-address | group-name} dont-capability-negotiate
ip-address – IP address of a neighbor.
group-name – A BGP peer group containing a list of neighboring routers
configured with the neighbor peer-group command.
Command Mode
Router Configuration
Default Setting
Capability negotiation is enabled
Command Usage
Earlier versions of BGPv4 require that when a BGP speaker receives an Open
message with one or more unrecognized Optional Parameters, the speaker must
terminate BGP peering. This command can be used when connecting to a partner
known to use an older BGP version which does not support capabilities negotiation
(RFC 2842), thereby allowing the peering session to continue.
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