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DES-7200 Configuration Guide Chapter 6 BGP
Configuration
6-12
that of the output routing policy, because the implementation of the output routing
policy is based on the routing table of this BGP Speaker. The implement of the
input routing policy is based on the route information received from the BGP peer.
To reduce the memory consumption, the local BGP Speaker will not remain the
original route information received from BGP peers.
If it is necessary to modify the input routing policy, the common method is to save
the original route information for each specified BGP peer in this BGP Speaker by
the neighbor soft-reconfiguration inbound command, so as to provide the
original foundation of the route information to modify the input routing policy in
future.
At present, there is a standard implementation method referred to as the Route
Refresh Performance, which can support modifying the routing policy without the
storage of the original route information. This product supports the route
refreshing performance.
If the input routing policy changes, execute the following operations in the BGP
configuration mode:
Command Function
DES-7200(config-router)# neighbor
{address | peer-group-name}
soft-reconfiguration inbound
(Optional) Restart the BGP session
and reserve the unchanged route
information sent by the BGP peer
(group).
Execution of this command will
consume more memory. If both
parties support the route refreshing
performance, it is not necessary to
execute this command.
DES-7200(config-router)# clear ip
bgp
{* | neighbor-address | peer-group
peer-group-name | external} soft in
Do soft reset of the BGP session and
execute the routing policy without
resetting up the BGP session.
You can judge whether the BGP peer supports the route refreshing performance
by the show ip bgp neighbors command. If so, you need to execute the
neighbor soft-reconfiguration inbound command when the input routing policy
changes.
6.8 Configuring Synchronization between BGP and IGP
The routing information can be transmitted to another AS through the local AS
only when ,it will pass through this AS and reach anther AS, the route information
will be advertised to ll the routers in the local AS have learned the routing