Off-stem cross-domain VPN-Option B scenario, the following description is incorrect?

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The outer layer tag is exchanged between two ASBRs to vpnV4 routes.

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During the packet forwarding process, it is necessary to exchange the VPN's private network LSP on the

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two ASBRs IP-EBGP neighbor relationships.

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The cross-domain VPN-Option B scheme is not limited by the number of interconnection links between ASBRs

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