ECS4660-28F_Management Guide-R03

C HAPTER 51 | IP Routing Commands
Border Gateway Protocol (BGPv4)
– 1866 –
neighbor
ebgp-multihop
This command allows eBGP neighbors to exist in different segments, and
configures the maximum hop count (TTL). Use the no form to restore the
default setting.
SYNTAX
neighbor {ip-address | group-name} ebgp-multihop [count]
no neighbor {ip-address | group-name} ebgp-multihop
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.
count – Maximum hop count. (Range: 1-255)
COMMAND MODE
Router Configuration
DEFAULT SETTING
eBGP neighbors must be located in the same segment.
COMMAND USAGE
◆ This command can be used to allow routers in different network
segments to create a BGP neighbor relationship.
◆ If this command is entered without specifying a count, the hop limit is
set at 255.
◆ To avoid creating loops through oscillating routes, a multi-hop session
will not be established if the only route to a multi-hop peer is the
default route.
EXAMPLE
Console(config-router)#neighbor 10.1.1.64 ebgp-multihop 2
Console(config-router)#
neighbor
enforce-multihop
This command enforces the requirement for all neighbors to form multi-
hop connections. Use the no form to disable this requirement.
SYNTAX
[no] neighbor {ip-address | group-name} enforce-multihop
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