Configuration Guide User guide

1420 FastIron Configuration Guide
53-1002494-02
Route flap dampening configuration
Syntax: show ip bgp flap-statistics [regular-expression <regular-expression> | <address> <mask>
[longer-prefixes] | neighbor <ip-addr>]
The regular-expression <regular-expression> parameter is a regular expression. The regular
expressions are the same ones supported for BGP4 AS-path filters. Refer to “Using regular
expressions to filter” on page 1397.
The <address> <mask> parameter specifies a particular route. If you also use the optional
longer-prefixes parameter, then all statistics for routes that match the specified route or have a
longer prefix than the specified route are displayed. For example, if you specify 209.157.0.0 longer,
then all routes with the prefix 209.157. or that have a longer prefix (such as 209.157.22.) are
displayed.
The neighbor <ip-addr> parameter displays route flap dampening statistics only for routes learned
from the specified neighbor. You also can display route flap statistics for routes learned from a
neighbor by entering the following command: show ip bgp neighbors <ip-addr> flap-statistics.
Table 241 shows the field definitions for the display output.
You also can display all the dampened routes by entering the show ip bgp dampened-paths
command.
TABLE 241 Route flap dampening statistics
Field Description
Total number of flapping routes Total number of routes in the Layer 3 switch BGP4 route table that have
changed state and thus have been marked as flapping routes.
Status code Indicates the dampening status of the route, which can be one of the following:
• > – This is the best route among those in the BGP4 route table to the route
destination.
• d – This route is currently dampened, and thus unusable.
• h – The route has a history of flapping and is unreachable now.
• * – The route has a history of flapping but is currently usable.
Network The destination network of the route.
From The neighbor that sent the route to the Layer 3 switch.
Flaps The number of flaps (state changes) the route has experienced.
Since The amount of time since the first flap of this route.
Reuse The amount of time remaining until this route will be un-suppressed and thus
be usable again.
Path Shows the AS-path information for the route.
Brocade#show ip bgp flap-statistics
Total number of flapping routes: 414
Status Code >:best d:damped h:history *:valid
Network From Flaps Since Reuse Path
h> 192.50.206.0/23 166.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 701
h> 203.255.192.0/20 166.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 7018
h> 203.252.165.0/24 166.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 7018
h> 192.50.208.0/23 166.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 701
h> 133.33.0.0/16 166.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 701
*> 204.17.220.0/24 166.90.213.77 1 0 :1 :4 0 :0 :0 65001 4355 701 62