Configures the maximum number of IP prefixes accepted from a BGP neighbor.
| remoteaddr | Specifies the IPv4 or IPv6 address of a BGP neighbor. The switch uses the IP address format to determine if the address is an IPv4 or IPv6 address. |
| all | Specifies that the configuration applies to all neighbors in the specified address family. If no address family is specified or if an IPv4 address is specified, the configuration applies to all IPv4 neighbors. If an IPv6 address family is specified, the configuration applies to all IPv6 neighbors. |
| 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. This address family is applicable for PE to PE BGP neighbor sessions only. This keyword may prompt warning or error messages if executed for a regular BGP neighbor session, or for a PE to CE neighbor session. |
| number | Specifies the maximum number of prefixes that can be accepted. The range is 0 to 4294967294. A value of 0 disables prefix limit feature. |
| percent | Specifies the percentage of the maximum prefix (threshold) at which a warning message is printed in the log (and console), and/or a trap is sent to the SNMP manager. |
| teardown | Specifies that the peer session is torn down when the maximum is exceeded. |
| seconds | Specifies the length of time before the session is re-established, if the session is torn down due to maximum prefix exceeded. If the hold-down interval is zero or not specified, it is kept down until the peer is enabled. The range is 30 to 86400 seconds. |
| send-traps | Specifies sending “number of prefix reached threshold” and “number of prefix exceed the max-prefix limit” SNMP traps. |
This feature is disabled by default.
The default threshold is 75%.
By default, teardown is not specified.
By default, send-traps is not specified.
This command applies to the current VR or VRF context.
If 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
For an IPv6 peer, an IPv6 address family must be specified, because an IPv6 peer does not support IPv4 address families. If no address family is specified for an IPv6 peer, the default, the IPv4 unicast address family, applies and the command fails. Similarly an IPv4 peer only supports IPv4 address families and the command fails if an IPv6 address family is specified.
Configure the peer group before configuring the neighbors. To configure the peer group, use the following command:
configure bgp peer-group peer-group-name {address-family [ipv4-unicast | ipv4-multicast | ipv6-unicast | ipv6-multicast | vpnv4]} maximum-prefix number {{threshold percent} {teardown {holddown-interval seconds}} {send-traps}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 the maximum number of IP prefixes accepted from all neighbors to 5000, sets the threshold for warning messages to 60%, and specifies SNMP traps:
configure bgp neighbor all maximum-prefix 5000 threshold 60 send-traps
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 ExtremeXOS and Switch Engine 31.7 Feature License Requirements document.