User Manual
433
Users Manual of XGS-6350-24X4C
45.4.2.1.1 Activating BGP Routing Choice
Run the following commands in global configuration mode to activate BGP route selecting:
Command Purpose
router bgp autonomous-system
Activates the BGP routing process in
router configuration mode.
networknetwork-number/masklen
[route-map route-map-name]
Marks the network as the local
autonomous system and adds it to the
BGP table.
(1) For EGP, when you use the router configuration command network to
configure an IP network, you can control which network can get notification. It
is contrary for IGP. For example, The RIP protocol uses the network
command to decide where the update is sent.
(2) You can use the network command to add the IGP route to the BGP routing
table. The router resources, such as the configured RAM, decide the upper
limit of the available network
command. As an additional choice, you also can
run the redistribute command.
45.4.2.1.2 Configuring BGP Neighbor
To exchange routing information with the outside, the BGP neighbor must be configured.
BGP supports two neighbors: IBGP and EBGP. The interior neighbors are in the same AS. The exterior
neighbors are in a different AS. In general, exterior neighbors are closely adjacent and share a subnet; interior
neighbors are in anyplace of the same AS.
Run the router configuration command to configure the BGP neighbors:
Command Purpose
neighbor {ip-address }
remote-asnumber
Designates a BGP neighbor.
For details, refer to the section “BGP Neighbor Configuration Example”.
45.4.2.1.3 Configuring BGP Soft Reconfiguration
In general, BGP neighbors exchange all routes only when the connection is created; they then exchange only
the changed routes later. If the configured routing policy is changed, you must clear the BGP sessions before
you apply the changed routing policy to the received routes. However, clearing the BGP session can disable
the high-speed cache and seriously undermine network running. You are recommended to adopt the soft
reconfiguration function because it helps to configure and activate policy without clearing BGP sessions.
Currently, the new soft reconfiguration function can be applied to each neighbor. The new soft reconfiguration
is applied to the incoming update generated by neighbors, it is called incoming soft reconfiguration. When the