Dell PowerConnect B-RX BigIron RX Series Configuration Guide v02.8.00 - Page 887

26 Filtering • The cooperative filtering configuration on the device. • The ORFs received from neighbors. To display the cooperative filtering configuration on the device, enter a command such as the following. The line shown in bold type shows the cooperative filtering status. BigIron RX# show ip bgp neighbor 10.10.10.1 1 IP Address: 10.10.10.1, AS: 65200 (IBGP), RouterID: 10.10.10.1 State: ESTABLISHED, Time: 0h0m7s, KeepAliveTime: 60, HoldTime: 180 RefreshCapability: Received CooperativeFilteringCapability: Received Messages: Open Update KeepAlive Notification Refresh-Req Sent : 1 0 1 0 1 Received: 1 0 1 0 1 Last Update Time: NLRI Withdraw NLRI Withdraw Tx: --- --- Rx: --- --- Last Connection Reset Reason:Unknown Notification Sent: Unspecified Notification Received: Unspecified TCP Connection state: ESTABLISHED Byte Sent: 110, Received: 110 Local host: 10.10.10.2, Local Port: 8138 Remote host: 10.10.10.1, Remote Port: 179 ISentSeq: 460 SendNext: 571 TotUnAck: 0 TotSent: 111 ReTrans: 0 UnAckSeq: 571 IRcvSeq: 7349 RcvNext: 7460 SendWnd: 16384 TotalRcv: 111 DupliRcv: 0 RcvWnd: 16384 SendQue: 0 RcvQue: 0 CngstWnd: 5325 Syntax: show ip bgp neighbor To display the ORFs received from a neighbor, enter a command such as the following. BigIron RX# show ip bgp neighbor 10.10.10.1 received prefix-filter ip prefix-list 10.10.10.1: 4 entries seq 5 permit 10.10.0.0/16 ge 18 le 28 seq 10 permit 20.20.10.0/24 seq 15 permit 30.0.0.0/8 le 32 seq 20 permit 40.10.0.0/16 ge 18 Syntax: show ip bgp neighbor received prefix-filter Configuring route flap dampening A "route flap" is the change in a route's state, from up to down or down to up. When a route's state changes, the state change causes changes in the route tables of the routers that support the route. Frequent changes in a route's state can cause Internet instability and add processing overhead to the routers that support the route. Route flap dampening is a mechanism that reduces the impact of route flap by changing a BGP4 router's response to route state changes. When route flap dampening is configured, the device suppresses unstable routes until the route's state changes reduce enough to meet an acceptable degree of stability. The Brocade implementation of route flap dampening is based on RFC 2439. Route flap dampening is disabled by default. You can enable the feature globally or on an individual route basis using route maps. BigIron RX Series Configuration Guide 811 53-1002253-01