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BGP Options

Select the Tools > Options > Design, Path Placement > BGP options pane to view the BGP-related network parameter defaults.

  • The Check IBGP Policy option is also set to false by default. Setting this to true turns on hop by hop IBGP policy checking for the special case where the BGP next hop is modified as a result of IBGP policies. Because this option is a special case and involves a lot of extra processing, it is not turned on by default. However, if it is being used in your network, this option needs to be turned on.

  • The IGP override option is set to false by default. This means that for external paths, BGP will be treated as having a higher administrative distance/preference than the IGP such as OSPF. If this is not the case, this parameter can be set to true.

  • The Use Live BGP Table if Available option can be used to take advantage of routing table information extracted from collected BGP routing tables for traffic routing.

  • The Peering AS Number(s) field will be filled in when running the BGP peering analysis. It is used to specify the AS that the network will be newly peering with. Hence, for that AS, information from the subnet file is needed to derive the BGP routing table. For more information on the subnet file, refer to BGP Subnets.