peer route-limit (BGP-Flow VPN instance IPv4 address family view)

Function

The peer route-limit command sets the maximum number of routes that can be received from a peer.

The undo peer route-limit command cancels the configuration.

By default, there is no limit on the number of routes that can be received from a peer.

Format

peer ipv4-address route-limit limit [ percentage ] [ alert-only | idle-forever | idle-timeout times ]

undo peer ipv4-address route-limit

Parameters

Parameter	Description	Value
ipv4-address	Specifies the IPv4 address of a peer.	It is in dotted decimal notation.
limit	Specifies the maximum number of routes that can be received from a peer.	The value is an integer ranging from 1 to 4294967295.
percentage	Specifies the proportion threshold of the number of received routes to the limit value.	The value is an integer ranging from 1 to 100. The default value is 75.
alert-only	Enables the device to send a threshold or threshold-crossing alarm and not to receive excess alarms if the percentage of the number of received routes to the maximum number of routes that can be received reaches the specified percentage or 100%. In this case, the peer relationship is not disconnected.	-
idle-forever	Enables the device to send a threshold alarm if the percentage of the number of received routes to the maximum number of routes that can be received exceeds the specified percentage. When the threshold is exceeded, the peer relationship is disconnected and will not be automatically re-established.	-
idle-timeout times	Enables the device to send a threshold alarm if the percentage of the number of received routes to the maximum number of routes that can be received reaches the specified percentage. When the threshold is exceeded, the peer relationship is disconnected and the connection timeout timer is automatically started. Before the timer expires, the device does not re-establish the connection.	The value is an integer ranging from 1 to 1200, in minutes.

Views

BGP-Flow VPN instance IPv4 address family view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bgp	write

Usage Guidelines

Usage Scenario

The peer route-limit command is used to set the maximum number of routes that a BGP device is allowed to receive from its peer. This provides a mechanism for controlling the routes received from peers in addition to distribution lists, filtering lists, and route mappings.

Configuration Impact

If the peer route-limit command is run for a peer group, the peers of the peer group inherit the configuration.

If a peer relationship between two devices is in the Established state, the following situations occur:

If the number of routes received by the device exceeds the maximum limit after you run the peer route-limit command for the first time or run the command to reduce the maximum limit:

If you specified alert-only in the command, the device does not disconnect its BGP peer. The received routes are not removed, and no additional routes will be accepted.
If you specified idle-forever in the command, the device disconnects its BGP peer. To re-establish the connection, run the reset bgp command.
If you specified idle-timeout in the command, the device disconnects its BGP peer and re-establishes its BGP peer relationship automatically after the timeout timer expires. To re-establish the connection before the timeout timer expires, run the reset bgp command.
If the upper limit set on the device is increased to be greater than the number of received routes, the device sends Refresh packets to receive routes again. If the device does not support the route-refresh capability, the device needs to re-establish the connection with its peer.
If the upper limit set on the device is reduced but is still greater than the number of received routes, only configuration parameters need to be modified.
If the alert-only, idle-forever, and idle-timeout are not specified and the proportion of the number of received routes to limit reaches percentage, the device generates an alarm; after the number of received routes exceeds the limit, the connection is interrupted and is automatically re-established in 30s.

Precautions

If the specified peer has the capability and the peer relationship is interrupted when the number of routes exceeds the threshold, the same peer in all address families will be affected, and the peer relationship will be re-established.

Example

# Set the maximum number of routes that can be received from a peer to 10000.

<HUAWEI> system-view
[~HUAWEI] ip vpn-instance vpna
[*HUAWEI-vpn-instance-vpna] ipv4-family
[*HUAWEI-vpn-instance-vpn1-af-ipv4] route-distinguisher 100:1
[*HUAWEI-vpn-instance-vpna-af-ipv4] quit
[*HUAWEI-vpn-instance-vpna] quit
[*HUAWEI] bgp 100
[*HUAWEI-bgp] vpn-instance vpna
[*HUAWEI-bgp-instance-vpna] peer 1.1.1.1 as-number 100
[*HUAWEI-bgp-instance-vpna] quit
[*HUAWEI-bgp] ipv4-flow vpn-instance vpna
[*HUAWEI-bgp-flow-vpna] peer 1.1.1.1 enable
[*HUAWEI-bgp-flow-vpna] peer 1.1.1.1 route-limit 10000