Huawei OptiX GCP applies the link management protocol (LMP) as the link management protocol, OSPF-TE as the routing protocol, and RSVP-TE as the signaling protocol.
The following sections describe the functions of these protocols in an ASON network.
LMP
The LMP performs the following functions in an ASON network.
Creating and maintaining the control channels between adjacent nodes.
The following is the procedure of creating control channels.
- See Figure 1. When two adjacent ASON NEs start up, the LMP uses the Ethernet or the D4-D12 bytes of DCC to transmit messages. Node 1 transmits messages to Node 2, which performs the check to the received messages. If the messages pass the check, Node 2 returns messages to Node 1. If the messages do not pass the check, Node 2 returns a message to Node 1, indicating that the messages fail to pass the check. In this way, Node 2 waits for another check. Hence, a control channel between the two adjacent nodes is created.
- After the control channel is created, the two nodes store the information about the control channel and identify the control channel according to the ID.
Verifying component links and TE links.
The following is the procedure of verifying component links and TE Links.
- After a logical board is created for an ASON NE, the ASON software creates component links for the optical interfaces of the board. Then, the attributes of component links are configured according to the attributes of the optical interface. The attributes include slot number, optical interface number, bandwidth and node ID.
- After component links are created, the ASON software creates corresponding TE links. In this case, the LMP starts to verify the component links and TE links. The LMP performs the verification to verify the consistency of information at both ends of a link. As shown in Figure 2, Node 1 transmits messages and the content to be checked to Node 2, which checks if it has the same information and returns the check result to Node 1. If the verification shows consistency, the OSPF-TE can then flood the information about the TE links to the entire network.
OSPF-TE
- Creates neighbor relations.
- Creates and maintains control links.
- Floods and collects the information about the control links on the control plane. According to the information, the protocol then generates the information about the routes that are required for forwarding messages on the control plane.
- Floods and collects the information about the TE links on the transport plane. The protocol then generates the information about the network service topologies for service trail computation.
RSVP-TE
- LSP creation
- LSP deletion
- LSP attribute modification
- LSP rerouting
- LSP trail optimization
Protocol Encryption
An external entity may modify the OSPF-TE protocol packets of the network, counterfeit a node of this network and transmit packets, or receive the packets transmitted by nodes in the network and repeat the attack. To prevent these network insecurities, the ASON provides the function to encrypt protocols. In an ASON domain, the RSVP and OSPF-TE protocols are encrypted for authentication.
The RSVP authentication is configured for nodes and the OSPF-TE authentication for interconnected interfaces (slots and optical interfaces).
- Non-authentication: No authentication is required in this mode.
- Plain text authentication: To verify the preset password. The authentication code must be a character string with no more than eight characters.
- MD5 authentication: To verify the information that is encrypted by the MD5 algorithm. The authentication code must be a character string with no more than 64 characters.
The check succeeds only when the authentication modes and passwords of adjacent nodes are the same.