Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 409)

Brocade ICX 6650 Layer 3 Routing Configuration Guide 391
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Updating route information and resetting a neighbor session
Using soft reconfiguration
The soft reconfiguration feature places policy changes into effect without resetting the BGP4
session. Soft reconfiguration does not request the neighbor or group to send its entire BGP4 table,
nor does the feature reset the session with the neighbor or group. Instead, the soft reconfiguration
feature stores all the route updates received from the neighbor or group. When you request a soft
reset of inbound routes, the software performs route selection by comparing the policies against
the stored route updates, instead of requesting the neighbor BGP4 route table or resetting the
session with the neighbor.
When you enable the soft reconfiguration feature, it sends a refresh message to the neighbor or
group if the neighbor or group supports dynamic refresh. Otherwise, the feature resets the
neighbor session. This step is required to ensure that the soft reconfiguration feature has a
complete set of updates to use, and occurs only once, when you enable the feature. The feature
accumulates all the route updates from the neighbor, eliminating the need for additional refreshes
or resets when you change policies in the future.
To use soft reconfiguration:
• Enable the feature.
• Make the policy changes.
• Apply the changes by requesting a soft reset of the inbound updates from the neighbor or
group.
Use the following CLI methods to configure soft configuration, apply policy changes, and display
information for the updates that are filtered out by the policies.
Enabling soft reconfiguration
To configure a neighbor for soft reconfiguration, enter a command such as the following.
Brocade(config-bgp-router)#neighbor 10.10.200.102 soft-reconfiguration inbound
This command enables soft reconfiguration for updates received from 10.10.200.102. The
software dynamically refreshes or resets the session with the neighbor, then retains all route
updates from the neighbor following the reset.
Syntax: [no] neighbor ip-addr | peer-group-name soft-reconfiguration inbound
NOTE
The syntax related to soft reconfiguration is shown. For complete command syntax, refer to “Adding
BGP4 neighbors” on page 292.
Placing a policy change into effect
To place policy changes into effect, enter a command such as the following.
Brocade(config-bgp-router)#clear ip bgp neighbor 10.10.200.102 soft in
This command updates the routes by comparing the route policies against the route updates that
the Layer 3 switch has stored. The command does not request additional updates from the
neighbor or otherwise affect the session with the neighbor.
Syntax: clear ip bgp neighbor ip-addr | peer-group-name soft in