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    Configuring an AS Path in a BGP Routing Policy (NSM Procedure)

    An autonomous system (AS) path is a path to a destination. An AS path consists of the AS numbers of all the network devices that a packet traverses if it takes the associated route to a destination. The AS numbers are assembled in a sequence, or path, that is read from right to left. For example, for a packet to reach a destination using a route with an AS path 5 4 3 2 1, the packet first traverses AS 1 and so on until it reaches AS 5, which is the last AS before its destination.

    You can define a match condition based on all of or portions of the AS path. You can create a named AS path and then include it in a BGP routing policy.

    To configure an AS path for a BGP routing policy in NSM:

    1. In the navigation tree, select Device Manager > Devices.
    2. In the Devices list, double-click the device to select it.
    3. Click the Configuration tab.
    4. In the configuration tree, expand Policy Options.
    5. Select As Path.
    6. Add or modify the parameters as specified in Table 1.
    7. Click one:
      • OK—To save the changes.
      • Cancel—To cancel the modifications.
      • Apply — To apply the protocol settings.

    Note: After you make changes to a device configuration, you must push that updated device configuration to the physical security device for those changes to take effect. You can update multiple devices at one time. See the Updating Devices section in the Network and Security Manager Administration Guide for more information.

    Table 1: AS Path Configuration Details

    Option

    Function

    Your Action

    Name

    Specifies the name of the AS path.

    Enter a name.

    Comment

    Specifies the comment for the AS path.

    Enters a comment.

    Path

    Specifies the AS path (as an AS number) to be included in the routing policy.

    Enter an AS path.

    Published: 2013-01-02