Foundry Configuration Guide for the FESX, FSX, and FWSX
21 - 100
© Foundry Networks, Inc.
December 2005
To display the active configuration for a specific route map, enter a command such as the following, which
specifies a route map name:
FESX424 Router# show route-map setcomm
route-map setcomm permit 1
set community 1234:2345 no-export
This example shows the active configuration for a route map called “setcomm“.
Syntax:
show route-map [<map-name>]
Updating Route Information and Resetting a Neighbor Session
The following sections describe ways to update route information with a neighbor, reset the session with a
neighbor, and close a session with a neighbor.
Whenever you change a policy (ACL, route map, and so on) that affects the routes that the Layer 3 Switch learns
from a BGP4 neighbor or peer group of neighbors, you must enter a command to place the changes into effect.
The changes take place automatically, but only affect new route updates. To make changes retroactive for routes
received or sent before the changes were made, you need to enter a clear command.
You can update the learned routes using either 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).
•
Clear (reset) the session with the neighbor or peer group. This is the only method you can use if the neighbor
does not support the refresh capability.
Each of these methods is effective, but can be disruptive to the network. The first method adds overhead while the
Layer 3 Switch learns and filters the neighbor’s or group’s entire route table, while the second method adds more
overhead while the devices re-establish their BGP4 sessions.
You also can clear and reset the BGP4 routes that have been installed in the IP route table. See “Clearing and
Resetting BGP4 Routes in the IP Route Table” on page 21-106.
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’s
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:
FESX424 Router(config-bgp-router)# neighbor 10.10.200.102 soft-reconfiguration
Содержание FastIron Edge Switch X424
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