reset bgp flap-info (User view)(IPv6)

Format

reset bgp ipv6 flap-info network-ipv6-address prefix-length

reset bgp ipv6 ipv6-address flap-info

reset bgp ipv6 flap-info

reset bgp vpn-instance vpn-instance-name ipv6-family flap-info [ network-ipv6-address prefix-length ]

reset bgp ipv6 flap-info as-path-filter { as-path-filter-num | as-path-filter-name }

reset bgp ipv6 flap-info regexp as-path-regexp

Parameters

Parameter	Description	Value
network-ipv6-address	Specifies the IPv6 address of a peer.	The value is a 32-digit hexadecimal number, in the format of X:X:X:X:X:X:X:X.
prefix-length	Specifies the network mask that is used to filter the BGP IPv6 routes. If neither of the mask nor mask length is specified, the address is considered as a classful address.	The value is an integer that ranges from 0 to 128.
ipv6	Clears the route flapping statistics on all IPv6 peers.	-
ipv6-address	Specifies the network address of an IPv6 peer.	The prefix is in the format of X:X:X:X:X:X:X:X.
vpn-instance vpn-instance-name	Clears the route flapping information of a specified VPN instance enabled with an IPv6 address family.	The value is a string of 1 to 31 case-sensitive characters, spaces not supported. In addition, the VPN instance name must not be _public_. When double quotation marks are used around the string, spaces are allowed in the string.
ipv6-family	IPv6 address family.	-
as-path-filter as-path-filter-num	Clears route flapping statistics based on a specified AS_Path filter.	It is an integer that ranges from 1 to 256.
as-path-filter as-path-filter-name	Clears route flapping statistics based on a specified AS_Path filter.	The value is a string of 1 to 51 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string.
regexp as-path-regexp	Clears statistics about the flapping routes that match the AS_Path regular expression.	The value is a string of 1 to 80 case-sensitive characters, spaces supported.

Views

User view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bgp	execute

Usage Guidelines

Usage Scenario

The process of adding a route to and then deleting the route from a routing table is called route flapping.

When route flapping occurs, the routing protocol sends Update packets to neighbors. The neighbors that receive the Update packets need to recalculate routes and modify its routing table. Therefore, frequent route flapping consumes great bandwidth and CPU resources and even seriously affects network operations.

The reset bgp flap-info command is used to clear the flapping information about routes. This allows the device to re-collect statistics about flapping routes and helps to monitor route changes and locate network problems.

Prerequisites

You can use display bgp routing-table flap-info command to view the information about BGP route flapping.

If there are a large number of flapping routes, define an AS_Path filter or an AS_Path regular expression to be referenced in the reset bgp flap-info command. The flapping statistics of the routes matching the AS_Path filter or the AS_Path regular expression are then cleared.

Configuration Impact

After the reset bgp flap-info command is run, the flapping statistics of routes are reset and cannot be displayed.

Follow-up Procedure

After the flapping statistics of routes are cleared, run the display bgp routing-table flap-info command again to display the flapping statistics about BGP routes in order to locate problems.

Example

# Clear the flapping statistics about the BGP4+ routes of the VPN instance named vpn1.

<HUAWEI> reset bgp vpn-instance vpn1 ipv6-family flap-info