H3C Technologies H3C S10500 Series Switches - Manual (Page 222)

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To do… Use the command… Remarks
Enter BGP view bgp as-number —
Specify the source interface for
establishing TCP connections to a
peer or peer group
peer { group-name | ip-address }
connect-interface interface-type
interface-number
Required
By default, BGP uses the outbound
interface of the best route to the BGP
peer or peer group as the source
interface for establishing a TCP
connection to the peer or peer
group.
NOTE:
To establish multiple BGP connections between two routers, you must specify the source interface for
establishing TCP connections to each peer on the local router; otherwise, the local BGP router may fail to
establish TCP connections to a peer when using the outbound interface of the best route to the peer as the
source interface.
Allowing establishment of eBGP connection to an indirectly
connected peer or peer group
Direct physical links must be available between eBGP peers. If they are not, use the peer ebgp-max-hop
command to establish a TCP connection over multiple hops between two peers.
Follow these steps to allow establishment of eBGP connection to an indirectly connected peer or peer
group:
To do… Use the command… Remarks
Enter system view system-view —
Enter BGP view bgp as-number —
Allow the establishment of eBGP
connection to an indirectly
connected peer or peer group
peer { group-name | ip-address }
ebgp-max-hop [ hop-count ]
Optional
Not allowed by default.
NOTE:
Do not configure the peer ebgp-max-hop command if the two eBGP peers are directly connected.
Controlling route generation
Different from IGP, BGP focuses on route generation and advertisement control and optimal route
selection.
Generating BGP routes can be done in the following ways:
• Configure BGP to advertise local networks
• Configure BGP to redistribute routes from other routing protocols, including the default route
Configuration prerequisites
BGP connections must be created.