Configures route flap dampening for a BGP peer group.
| peer-group-name | Specifies a peer group. |
| ipv4-unicast | Specifies the IPv4 unicast address family. |
| ipv4-multicast | Specifies an IPv4 multicast address family. |
| ipv6-unicast | Specifies the IPv6 unicast address family. |
| ipv6-multicast | Specifies an IPv6 multicast address family. |
| vpnv4 | Specifies the VPNv4 address family for Layer 3 VPN support. |
| half-life-minutes | Specifies the dampening half life. |
| reuse-limit-number | Specifies the reuse limit. |
| suppress-limit-number | Specifies the suppress limit. |
| max-suppress-minutes | Specifies the maximum hold down time. |
| policy-name | Specifies a policy. |
| none | Removes any policy association. |
This feature is disabled by default.
If no address family is specified, IPv4 unicast is the default.
This command applies to the current VR or VRF context.
The half life is the period of time, in minutes, during which the accumulated penalty of a route is reduced by half. The range is 1 to 45 minutes, and the default is 15 minutes.
The reuse limit is the penalty value below which a route is used again. The range is 1-20,000, and the default is 750.
The suppress limit is the penalty value above which a route is suppressed. The range is 1-20,000, and the default is 2,000.
The maximum hold down time is the maximum time a route can be suppressed, no matter how unstable it has been, as long as it no longer flaps. The range is 1-255 minutes, and the default is 4 * the half life.
If you change dampening parameters when routes are in suppressed or history state, the new dampening parameters apply only to routes in the active state. Routes in the suppressed or history state continue to use the old dampening parameters until they become active, at which time they use the updated dampening parameters.
Instead of explicitly configuring the dampening parameters using the command line, you can associate a policy using the policy-filter option. Multiple sets of parameters can be supplied using a policy.
Use the following command to disable route flap dampening for a BGP peer-group:
configure bgp peer-group peer-group-name {address-family [ipv4-unicast | ipv4-multicast | ipv6-unicast | ipv6-multicast | vpnv4]} no-dampeningIf you do not specify an address family, this command applies to the IPv4 unicast address family. To apply this command to an address family other than the IPv4 unicast address family, you must specify the address family.
Note
If the specified peer group contains IPv6 peers, it is an IPv6 peer group and you must specify an IPv6 address-family. When the specified peer group is an IPv6 peer group, this command fails if no address family is specified or if an IPv4 address-family is specified. This command also fails if an IPv6 address family is specified for an IPv4 peer-group.
To configure this feature on Layer 3 VPNs, you must configure this feature in the context of the MPLS-enabled VR; this feature is not supported for BGP neighbors on the CE (VRF) side of the PE router.
The following command configures route flap dampening for the BGP peer group outer:
configure bgp peer-group outer dampening
This command was first available in ExtremeXOS 10.1.
This command required a specific license in ExtremeXOS 11.1.
Support for IPv6 was added in ExtremeXOS 12.6 BGP.
Support for Layer 3 VPNs was added in ExtremeXOS 15.3.
This command is available on platforms that support the appropriate license. For complete information about software licensing, including how to obtain and upgrade your license and which licenses support the BGP feature,see the Switch Engine v33.1.1 Licensing Guide document.