Brocade BigIron RX Series Configuration Guide - Manual (Page 976)

898 BigIron RX Series Configuration Guide
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Filtering
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If you make changes to filters or route maps and the neighbor does not support dynamic route
refresh, use these methods to ensure that neighbors contain only the routes you want them to
contain.
• If you close a neighbor session, the device and the neighbor clear all the routes they learned
from each other. When the device and neighbor establish a new BGP4 session, they exchange
route tables again. Use this method if you want the device to relearn routes from the neighbor
and resend its own route table to the neighbor.
• If you use the soft-outbound option, the device compiles a list of all the routes it would
normally send to the neighbor at the beginning of a session. However, before sending the
updates, the device also applies the filters and route maps you have configured to the list of
routes. If the filters or route maps result in changes to the list of routes, the device sends
updates to advertise, change, or even withdraw routes on the neighbor as needed. This
ensures that the neighbor receives only the routes you want it to contain. Even if the neighbor
already contains a route learned from the device that you later decided to filter out, using the
soft-outbound option removes that route from the neighbor.
You can specify a single neighbor or a peer group.
To close a neighbor session and thus flush all the routes exchanged by the device and the neighbor,
enter the following command.
BigIron RX# clear ip bgp neighbor all
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.
To resend routes to a neighbor without closing the neighbor session, enter a command such as the
following.
BigIron RX# clear ip bgp neighbor 10.0.0.1 soft out
Clearing and resetting BGP4 routes in the IP route table
To clear BGP4 routes from the IP route table and reset the routes, enter a command such as the
following.
BigIron RX# clear ip bgp routes
Syntax: clear ip bgp routes [<ip-addr>/<prefix-length>]
Clearing traffic counters
You can clear the counters (reset them to 0) for BGP4 messages.
To clear the BGP4 message counter for all neighbors, enter the following command.
BigIron RX# clear ip bgp traffic
Syntax: clear ip bgp traffic
To clear the BGP4 message counter for a specific neighbor, enter a command such as the
following.