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818 BigIron RX Series Configuration Guide
53-1001810-01
Filtering
26
Dynamically refreshing routes
The following sections describe how to dynamically refresh BGP4 routes to place new or changed
filters into effect.
To request a dynamic refresh of all routes from a neighbor, enter a command such as the following.
BigIron RX(config-bgp)# clear ip bgp neighbor 192.168.1.170 soft in
This command asks the neighbor to send its BGP4 table (Adj-RIB-Out) again. The device applies its
filters to the incoming routes and adds, modifies, or removes BGP4 routes as necessary.
Syntax: clear ip bgp neighbor all | <ip-addr> | <peer-group-name> | <as-num> [soft-outbound |
soft [in | out]]
The all | <ip-addr> | <peer-group-name> | <as-num> specifies the neighbor. The <ip-addr>
parameter specifies a neighbor by its IP interface with the device. The <peer-group-name>
specifies all neighbors in a specific peer group. The <as-num> parameter specifies all neighbors
within the specified AS. The all parameter specifies all neighbors.
The soft-outbound parameter updates all outbound routes by applying the new or changed filters,
but sends only the existing routes affected by the new or changed filters to the neighbor.
The soft [in | out] parameter specifies whether you want to refresh the routes received from the
neighbor or sent to the neighbor:
•
soft in does one of the following:
•
If you enabled soft reconfiguration for the neighbor or peer group, soft in updates the
routes by comparing the route policies against the route updates that the device has
stored. Soft reconfiguration does not request additional updates from the neighbor or
otherwise affect the session with the neighbor. Refer to
“Using soft reconfiguration” on
page 815.
•
If you did not enable soft reconfiguration, soft in requests the neighbor’s entire BGP4
route table (Adj-RIB-Out), then applies the filters to add, change, or exclude routes.
•
If a neighbor does not support dynamic refresh, soft in resets the neighbor session.
•
soft out updates all outbound routes, then sends the device’s entire BGP4 route table
(Adj-RIB-Out) to the neighbor, after changing or excluding the routes affected by the filters.
If you do not specify in or out, the device performs both options.
NOTE
The soft-outbound parameter updates all outbound routes by applying the new or changed filters,
but sends only the existing routes affected by the new or changed filters to the neighbor. The soft
out parameter updates all outbound routes, then sends the BigIron RX’s entire BGP4 route table
(Adj-RIB-Out) to the neighbor, after changing or excluding the routes affected by the filters. Use
soft-outbound if only the outbound policy is changed.
To dynamically resend all the BigIron RX’s BGP4 routes to a neighbor, enter a command such as the
following.
BigIron RX(config-bgp)# clear ip bgp neighbor 192.168.1.170 soft out
This command applies its filters for outgoing routes to the BigIron RX’s BGP4 route table
(Adj-RIB-Out), changes or excludes routes accordingly, then sends the resulting Adj-RIB-Out to the
neighbor.