Brocade Virtual ADX Switch and Router Guide (Supporting ADX v03.1.00) - Manual (Page 349)

Brocade Virtual ADX Switch and Router Guide 335
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Displaying BGP4+ information
9
Displaying route flap dampening statistics
To display route dampening statistics for all dampened routes, enter the following command at any
level of the CLI.
Syntax: show ipv6 bgp flap-statistics [ipv6-prefix/prefix-length [longer-prefixes] | as-path-filter
number | neighbor ipv6-address | regular-expression regular-expression]
The ipv6-prefix/prefix-length parameter displays statistics for the specified IPv6 prefix only. You
must specify the ipv6-prefix parameter in hexadecimal using 16-bit values between colons as
documented in RFC 2373. You must specify the prefix-length parameter as a decimal value. A slash
mark (/) must follow the ipv6-prefix parameter and precede the prefix-length parameter.
The longer-prefixes keyword allows you to display statistics for routes that match a specified or
longer IPv6 prefix. For example, if you specify 2001:db8:2000::/16 longer-prefixes, then all routes
with the prefix 2001:db8:2002:: or that have a longer prefix (such as 2001:db8:2002:e016::/32)
are displayed.
The as-path-filter number parameter specifies an AS path filter to display. Specify a filter number.
The neighbor ipv6-address parameter displays statistics for routes learned from the specified
neighbor only. You also can display route flap statistics for routes learned from a neighbor by
entering the following command: show ipv6 bgp neighbor ipv6-address flap-statistics.
The regular-expression regular-expression parameter is a regular expression. The regular
expressions are the same ones supported for BGP4 AS-path filters. For more information about
regular expressions, see
“Configuring BGP4+” on page 310.
You can also display route flap dampening statistics for a specified IPv6 neighbor. For more
information, refer to
“Displaying route flap dampening statistics for a BGP4+ neighbor” on
page 345.
This display shows the following information.
TABLE 8 Route flap dampening statistics
This field... Displays...
Total number of flapping routes The total number of routes in the Virtual ADX device’s 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’s 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 IPv6 address of the advertising peer.
Virtual ADX# show ipv6 bgp flap-statistics
Total number of flapping routes: 14
Status Code >:best d:damped h:history *:valid
Network From Flaps Since Reuse Path
h> 2001:db8:2001:2::/32 2001:db8:3001:23::47 1 0 :0 :13 0 :0 :0 65001
701
*> 2001:db8:3892:34::/32 2001:db8:3001:23::47 1 0 :1 :4 0 :0 :0 65
701 62