How private network labels are distributed on an L3VPN

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Private network labels can be distributed in either of the following ways:

1.One label per VPN instance
2.One label per VPN route
When a large number of VPN routes exist on a network, many private network labels are required if one VPN route is allocated with one label. These private network labels may use up all entries. In this case, each VPN instance can be allocated a private network label to reduce the chip entries used.

Other related questions:
FAQ-How private network labels are distributed on an L3VPN
For S series switches (except S1700 switches), private network labels are distributed on an L3VPN using either of the following ways: 1. One label per VPN instance 2. One label per VPN route (default method) When a large number of VPN routes exist on a network, many private network labels are required if the default label distribution method is used. These private network labels may use up all entries. In this case, each VPN instance can be allocated a private network label to reduce the chip entries used.

FAQ-Why does traffic forwarding fail when the L3VPN label distribution method changes from per-route label to per-instance label
For S series switches (except S1700 switches), why does traffic forwarding fail when the L3VPN label distribution method changes from per-route label to per-instance label? When this problem occurs, check whether a large number of BGP LSPs exist on the switch before the change of the label distribution method. (BGP LSPs occupy resources in the MPLS decapsulation table.) In V200R003 and earlier versions, the per-route label distribution method is used for L3VPN. The number of entries in the MPLS decapsulation table of a switch is limited. Besides, the MPLS decapsulation table is a hash table and may encounter hash collisions. When there are a large number of local routes for an L3VPN, many entries in the MPLS decapsulation table are occupied. The per-instance label distribution method is recommended in this case. When the label distribution method changes from per-route label to per-instance label, new BGP LSPs are generated in the VPN instance. If a large number of BGP LSPs exist on the switch before the change, the new BGP LSPs may cause hash collisions in the MPLS decapsulation table. As a result, traffic forwarding fails in the L3VPN. Operation Notes: Before changing the label distribution method to per-instance label on the switch, check the number of existing BGP LSPs. If there are a large number of BGP LSPs, withdraw local routes in the L3VPN to reduce the number of BGP LSPs, and then change the label distribution method.

How can the TE30 on a private network communicate with a terminal on another private network?
To enable two TE30s on two private networks to communicate, their IP addresses must be mapped to the same IP address on a public network through NAT. For details, see chapter 4 Endpoints on Different Private Networks in the HUAWEI TE30&TE40&TE50&TE60&TX50 Videoconferencing Endpoint Configuration Examples.

How the terminal is configured in a private network during private and public networking
To configure the terminal in a private network, start the NAT and configure the NAT address. The procedure for configuring the NAT is as follows: On the screen controlled by the remote control, choose Settings > Network > IP > Firewall, start the NAT, and set NAT address parameters. Configure the NAT address mapping on the router. For details, contact the router vendor. NOTE: The parameter NAT address is the IP address of the terminal in the public network. By using the network address translation (NAT) technology, a device within the LAN can use a dedicated internal IP address and an external IP address that can be used for the communications with external devices. If the NAT technology is used, set the IP address in the WAN for the terminal.

Which networks does L3VPN support
Layer 3 virtual private network (L3VPN) supports the following networks: -Basic BGP/MPLS IP VPN -Inter-AS VPN, including Option A, Option B, and Option C

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