ECS4660-28F_Management Guide-R03

C HAPTER 51 | IP Routing Commands
Border Gateway Protocol (BGPv4)
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COMMAND MODE
Router Configuration
DEFAULT SETTING
No limit is set
DEFAULT USAGE
◆ This command is used to control the maximum number of route
prefixes that can be sent by a neighbor. It provides a method to reserve
resources for other processes, or to prevent malicious attacks.
◆ If the threshold is specified, but neither the restart nor warning
keywords are used), the connection will be closed until the records are
cleared with the clear ip bgp command.
EXAMPLE
In this example, the router warns when the number of route prefixes
reaches 6, and the connection will be closed when the prefixes hit 13.
Console(config-router)#neighbor 10.1.1.64 maximum-prefix 12 50
Console(config-router)#
neighbor
next-hop-self
This command configures the local router as the next hop for a neighbor in
all routing messages it sends. Use the no form to disable this feature.
SYNTAX
[no] neighbor {ip-address | group-name} next-hop-self
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
Disabled
DEFAULT USAGE
◆ iBGP routers only connected to other iBGP routers in same segment will
not be able to talk with iBGP routers outside of the segment if they are
not directly connected with each other. This command can be used in
these kinds of networks (i.e., un-meshed or non-broadcast) where iBGP
neighbors may not have direct access to all other neighbors on the
same IP subnet.
◆ Even when a successful BGP relationship seems to have been
established within the local AS, you may not able to see some routes in
the routing table. iBGP routers only connected with other iBGP routers