Syntax: as-format asdot
device# as-format asdot+
device# show ip bgp
Total number of BGP Routes: 1
Status codes: s suppressed, d damped, h history, * valid, > best, i internal, S stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 10.1.1.0/24 192.168.1.5 1 100 0 1.24464 0.100 0.200
0.65535 1.0 1.1 1.2 1.3 1.9464?
Syntax: as-format asdot+
Updating route information and resetting a neighbor session
The following sections describe how to update route information with a neighbor, reset a session with a neighbor, and close a session
with a neighbor.
Any change to a policy (ACL, route map, and so on) is automatically applied to outbound routes that are learned from a BGP4 neighbor
or peer group after the policy change occurs. However, you must reset the neighbor to update existing outbound routes.
Any change to a policy is automatically applied to inbound routes that are learned after the policy change occurs. However, to apply the
changes to existing inbound routes (those inbound routes that were learned before the policy change), you must reset the neighbors to
update the routes using one of the following methods:
• Request the complete BGP4 route table from the neighbor or peer group. You can use this method if the neighbor supports the
refresh capability (RFCs 2842 and 2858). Most devices today support this capability.
• Clear (reset) the session with the neighbor or peer group. This is the only method you can use if soft
reconguration is enabled
for the neighbor.
You also can clear and reset the BGP4 routes that have been installed in the IP route table.
Using soft reconguration
The soft reconguration feature applies policy changes without resetting the BGP4 session. Soft reconguration does not request the
neighbor or group to send the entire BGP4 table, nor does the feature reset the session with the neighbor or group. Instead, soft
reconguration 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 reconguration 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 reconguration 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 reconguration:
• Enable the feature.
• Make the policy changes.
• Apply the changes by requesting a soft reset of the inbound updates from the neighbor or group.
Enabling soft
reconguration
To congure a neighbor for soft reconguration, enter a command such as the following.
device(config-bgp)# neighbor 10.10.200.102 soft-reconfiguration inbound
Displaying BGP4 information
FastIron Ethernet Switch Layer 3 Routing
53-1003627-04 469
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