If As is configured-set, the AS_PATH of the summary route contains the AS path information of all specific routes to prevent routing loops

If Supp is configuredress-policy also generates aggregated routes. The if-match clause in Route-policy is used to select suppressed detailed routes. Detailed routes matching the Route-policy will still be advertised to other BGP neighbors

If Origin is configured-policy, only with Route Only the detailed routes matching the policy can participate in the aggregation

If Attrbute-policy is configured, you can change the attributes of the aggregated route

During packet forwarding, the two ASBRs need to exchange the VPN's private network LSP once.

An IP-EBGP neighbor relationship needs to be established between two ASBRs.

Cross-domain VPThe N_OptionB scheme is not limited by the number of interconnecting links between ASBRs.

twoThe ASBRs exchange outer labels for VPNV4 routes.

Eerror Notification Message

Keepalive Message

Initialization Message

Hello Message