Abstract: The present disclosure discloses a method for processing a host route in a virtual subnet, a related device and a communications system. The method includes: receiving, by a first provider edge device, a packet for address resolution, where a virtual subnet site in which the first provider edge device is located further includes at least one second provider edge device; determining, by the first provider edge device, whether a source MAC address carried in the packet is a virtual MAC address; and when it is determined that the source MAC address is a virtual MAC address, skipping performing at least one of the following operations: saving a local CE host routing table entry corresponding to a source IP address carried in the packet, or distributing, in the virtual subnet based on a routing protocol of a layer 3 VPN, a local CE host route corresponding to the IP address.

Abstract: This application provides a method for implementing a Layer 3 virtual private network (L3VPN) and an apparatus. The method includes receiving, by a first PE, an attachment notification packet sent by a first terminal device, a first site attaches to an L3VPN by using the first PE; a second site attaches to the L3VPN by using a second PE, and a first terminal device attaches to a second site before attaching to the first site. The method also includes obtaining, by the first PE, an IP address of a second terminal device, and the second terminal device attaches to the second Site; and sending, by the first PE, a binding update notification packet to the first terminal device, where the binding update notification packet carries a MAC address of the first PE and the IP address of the second terminal device.

Abstract: The application discloses a method and an apparatus for forwarding an MPLS data packet, which are used in an environment of hybrid networking of an SR network and a non-SR network. The method is as follows: when obtaining a to-be-sent MPLS data packet, a first SR router in an SR network determines whether a next-hop router supports an SR characteristic; the first SR router encapsulates the MPLS data packet into an IP tunnel when determining that the next-hop router does not support the SR characteristic, and sends an encapsulated MPLS data packet to the next-hop router to enable the encapsulated MPLS data packet to be forwarded, based on an IP routing table, to a second SR router. In this way, correct forwarding of an MPLS data packet is completed in an environment of hybrid networking of an SR router and a non-SR router.

Abstract: The present invention provides a packet sending method and a network device. The packet sending method includes: receiving, by a network device, a first data packet; and if a MAC entry matching a destination MAC address of the first data packet is not found in a media access control MAC address table of the network device, sending, by the network device, the first data packet according to a forwarding behavior in a MAC default entry of the MAC address table. When the MAC entry matching the destination MAC address of the first data packet is not found, the network device does not need to flood the first data packet on all interfaces, but directly sends the first data packet according to the MAC default entry in the own MAC address table, thereby reducing a need for MAC address capacity in the network device, and not increasing unnecessary network traffic.

Abstract: The present application provides a packet sending method and a network device. The packet sending method includes: receiving, by a network device, a first data packet; and if a MAC entry matching a destination MAC address of the first data packet is not found in a media access control MAC address table of the network device, sending, by the network device, the first data packet according to a forwarding behavior in a MAC default entry of the MAC address table. When the MAC entry matching the destination MAC address of the first data packet is not found, the network device does not need to flood the first data packet on all interfaces, but directly sends the first data packet according to the MAC default entry in the own MAC address table, thereby reducing a need for MAC address capacity in the network device, and not increasing unnecessary network traffic.

Abstract: This application discloses a packet processing method and an LSR. The method includes: receiving, by an Ingress LSR of a first MPLS tunnel, a first notification packet that is based on an IGP, where the first notification packet includes an ELC flag, which is used to indicate that the first Egress LSR has ELC; after learning from the first notification packet that the first Egress LSR has ELC, inserting a label into a first packet, to generate a second packet, where the label forms an MPLS label stack, which includes, from bottom to top, a first EL, a first ELI, and a first TL; and sending the second packet to the first Egress LSR through the first MPLS tunnel. According to the solutions of this invention, a Transit LSR of the first MPLS tunnel may perform load balancing when forwarding the second packet.

Abstract: The present invention discloses a method for obtaining IPv6 configuration information in an IPv6 transition network. The network includes an IPv4 network and an IPv6 network. An apparatus for providing IPv6 configuration information in the IPv4 network receives an IPv6 configuration information obtaining request packet sent by a user side device. In response, the apparatus sends a response packet to the user side device, where the response packet is a DHCPv4 packet, and carries the requested IPv6 configuration information. Some of the advantages of the present invention are that automatic configuration for a user side device which needs to traverse the IPv4 network to access the IPv6 network is implemented, and efficiency is greatly improved compared with a manual configuration method in the prior art.

Abstract: Embodiments of the present invention relate to the field of communications technologies, and disclose a performance-based routing method and device, which can implement exchange of a performance route by expanding a BGP protocol. A first PCR receives first performance routing information sent by a second PCR. The first performance routing information includes a first performance parameter attribute. It is determined whether a performance route corresponding to the first performance routing information exists in an adjacent routing information base-in Adj-RIB-in of the first PCR. The performance route is added to the Adj-RIB-in when the performance route does not exist in the Adj-RIB-in.

Abstract: A multi-address space mobile network architecture is disclosed, in which edge networks (ENs) are connected to a core network (CN) through core edge routers (CERs). A distributed hash table (DHT) set in the CN is adapted to not only store or update a mapping relation between a CER ID and CER location information in the CN, but also receive registration information sent from a host through the CER, and store or update mapping relations between a host ID host identifier (HI) and the CER ID and between the HI and host location information. A method for registering host information includes the steps as follows. The host acquires routable host location information in an EN to which the host currently added and information of the CER in the EN. The host sends registration information to the CN through the CER in the EN. Further, a method for sending data is described. The network architecture and methods of the present invention may improve update and query efficiency of the registration information from the host.

Abstract: A method for managing a MAC address entry in a TRILL network is disclosed. A first routing bridge obtains a TCN message through a switch connected to the first routing bridge. The first routing bridge clears a MAC address entry of the first routing bridge taking the first routing bridge as an egress bridge and sends a LSP packet to a second routing bridge in the TRILL network, so as to enable the second routing bridge to clear a MAC address entry of the second routing bridge taking the first routing bridge as the egress bridge. The second routing bridge and the first routing bridge are located in the same VLAN.

Abstract: A composite material polyurethane rigid foam decoration Roman column, includes: a column shell, which has an inner space is defined by the column shell closed rounding, wherein, the column shell comprises a column basis part, a column body part provided on the column basis part; and a column cap part provided on the column body part; and an inner layer, the material of which is PU, closely joints on the inner surface of the column shell, which is combined with the column shell to form a composite material to strengthen the support strength and the resistance of the column shell.

Abstract: The present invention discloses a method, a device, and a communications system for managing and querying mapping information. The method for managing mapping information includes: signing a mapping information pair by using a private key of a certificate corresponding to a prefix in the mapping information pair to generate a signed mapping pair; submitting the signed mapping pair to a registration agent (RA) in a transit network; and sharing, by the RA, the signed mapping pair with other RAs through data synchronization. With the mapping information management method, data transmission method, devices and communications system provided by the present invention, the security of mapping information in registration, query, and synchronization operations is guaranteed.

Abstract: The present invention provides a packet sending method and a network device. The packet sending method includes: receiving, by a network device, a first data packet; and if a MAC entry matching a destination MAC address of the first data packet is not found in a media access control MAC address table of the network device, sending, by the network device, the first data packet according to a forwarding behavior in a MAC default entry of the MAC address table. When the MAC entry matching the destination MAC address of the first data packet is not found, the network device does not need to flood the first data packet on all interfaces, but directly sends the first data packet according to the MAC default entry in the own MAC address table, thereby reducing a need for MAC address capacity in the network device, and not increasing unnecessary network traffic.

Abstract: A method and device for installing and distributing routes are disclosed. The routes are classified and installed respectively according to route types. Therefore, the distributed storage of a Forwarding Information Base (FIB) is automated, massive manual configuration work is avoided, and the problem of oversized FIB of the router as a result of fast growth of the routing table is solved.

Abstract: An information forwarding method includes obtaining data information to be forwarded which carries a route indicator indicating a destination edge network, obtaining route information to a border router in the destination edge network according to the route indicator, and sending the data information to the border router in the destination edge network for forwarding. An information forwarding device is also provided.

Abstract: The present invention discloses a method for obtaining IPv6 configuration information in an IPv6 transition network. The network includes an IPv4 network and an IPv6 network. An apparatus for providing IPv6 configuration information in the IPv4 network receives an IPv6 configuration information obtaining request packet sent by a user side device. In response, the apparatus sends a response packet to the user side device, where the response packet is a DHCPv4 packet, and carries the requested IPv6 configuration information. Some of the advantages of the present invention are that automatic configuration for a user side device which needs to traverse the IPv4 network to access the IPv6 network is implemented, and efficiency is greatly improved compared with a manual configuration method in the prior art.

Abstract: A transmission method, system, and router based on a border gateway protocol (BGP) are provided. The method includes: notifying a standby route and a data packet ID corresponding to the standby route to a peer autonomous system (AS); receiving a data packet carrying a data packet ID from the peer AS; and forwarding the data packet via a standby route corresponding to the data packet ID carried in the data packet. The transmission performance based on the BGP can be improved by applying the present invention.

Abstract: A method and a system for obtaining a Host Identity Tag (HIT) are disclosed. The method for obtaining an HIT includes: receiving an update message that carries a newly generated HIT; and obtaining the newly generated HIT from the update message. In the method and system for obtaining an HIT above, the latest HIT and the current IP address of the host are obtained from the update message directly, or a third-party server is used to obtain the latest HIT according to the mapping relationship between the new HIT and the old HIT. In this way, normal communication may be performed.

Abstract: The present disclosure discloses a method and device for advertising routing information and a method and system for implementing packet routing. The method for advertising routing information includes a routing information advertising device that obtains its address information; the routing information advertising device adds the address information to routing information to advertise; and the routing information advertising device advertises the routing information that carries the address information. With the technical solution of the present disclosure, the number of routing tables in a backbone network may be greatly reduced. This minimizes the rise of router costs and effectively avoids slower route convergence. In addition, a router in the backbone network can dynamically obtain address information of a core router that advertises an aggregate prefix, such that it may be easier to implement registration, update and query the mapping between a more detailed address prefix and a border router.

Abstract: The present disclosure relates to a method for enabling an Internet Protocol version 6 (IPv6) host to access an Internet Protocol version 4 (IPv4) host, a method for obtaining an IPv6 address prefix, and a translation apparatus. The method includes: obtaining, by a source host, an address prefix used for translating an IPv4 address into an IPv6 address; and translating, by a source host, an IPv4 address into an IPv6 address. The translation apparatus includes: a prefix obtaining unit and an address translating unit. The prefix obtaining unit is configured to obtain an address prefix used for translating an IPv4 address into an IPv6 address, and the address translating unit is configured to perform translation between IPv4 and IPv6 addresses.